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1 AM 100
=0.7A 149 B 170
C 124.5 D 135
2 AM
=0.5 BC
A 83.30% B 94.40%
C 96% D 88.88%
3 I 4:3
A I B F
C A R D N
4 1 32 ,
A 32 B 8
C 5 D 4
5 I (IF) FM
A 455 KH B 10.7 MH
C 70 MH D 118.7 MH
6 A FM
A I B I
C I D I
7 FM AM R
A RF B M
C A D AGC
8 D FM
A P B N
C D A
9 AM 600 KH Q=100, IF 455
KH. I B
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A 20B B 30B
C 35.5B D 46.5B
10 C
A B
C A D FE
11 B B QPK
A B
C D
12 8PK ?
A 900 B 450
C 22.50 D 150
13 N QAM
A 2 B 4
C 8 D 16
14 M ()
A L B H
C L D F
15 D
A RF B IF
C D
16 CD .
A 8000 / B 16000 /
C 20000 / D 44100 /
17 O .
A L B M
C L NR D D
18
A PAM B PM
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C PPM D N
19 N
10 KH 128
A 1280 K B 140 K
C 70 K D 64
20 C
A B R
CA NR
D A
21 GM900
A 890915 MH B 935960 MH
C 890960 MH D 890910 MH
22 D GM1800
A 45 MH B 95 MH
C 25 MH D 50 MH
23 F GM .
A M B B
C M D B
24 I PN 30105 1000, P
D ..
A 3000 B 6000
C 30000 D 60000
25 F K B
A 2 GH 4 GH B 4 GH 8 GH
C 8 GH 12 GH D 12 GH 18 GH
26
1.5 1 E10.
A 1 GH B 5 GH
C 10 GH D 15 GH
27 D GM
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A 104 B 64
C 13 D 2.2
28 CELP .
A B P
C C D H
29 I NR PCM 9 8
A 1 B B 3 B
C 6 B D 12 B
30 I
A B
C G D A
31
A B
C D
32
AE
B
A
CA
D
33 A P' . I
5. ..
A 0 B 0.5
C 1 D 534
A B C
C B D B'
35 A 50. I
50. N ..
A 1 B 2
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C 0 D N
36 C NR B . NR 60 B
A 57 B B 180 B
C 51.23 B D 55.23 B
37 P RF AM 12 4.
M
A 0.25 B 0.33
C 0.5 D 0.66
38R RF 1 MH, 10 KH. Q
.
A 0.1 B 10
C 50 D 100
39 B
A AM B DBC
C PM D PM
40 M AM 10 KH 20
KH, M ..
A B
C D 10
41 P
A
B
C
.D
.42 O E
A HF B
CB I
D I
43 G 1=1.5
2=1. M . (=3108/)
A 2.5 / B 2.5 /
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C 5 / D 5 /
44 I CDMA
AE
B
E
CE
D N
45 F
A B M
C M D
46 E PIN P
()
A E B
C G D I
47 N (NA)
A NA= B NA=
C NA=1 D NA=(12)
1/2
48 B 10
=0.5
A 0.625 B 1.25
C 2.5 D 5
49 B 10
=0.5
A 0.625 B 1.25
C 2.5 D 5
50 C
A B D
C A & B D N
51 I GM 1: N=7 2: N=19
A C 1 IR B C 2 IR
C C 1 C 2 IR D N N IR
52 I GM 1: N=7 2: N=19
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AC 1
B
C 2
C C 1 C 2 C
D N N
53 I AM 0.5 0.75
A B 1.5 B B 1.5
C B D N
54 I FM , 5 10 .
A B
C 1.41 D R
55 I GM 5 MH ,
A 1/5,
A 15 B 25
C 40 D 200
56
A B
C D
57 ?
A AMP B GM
C IM2000 D NAM
58 B GM ..
A R B R
C I DR
59 F
A Q=R/D B Q=RD
C Q=D/R2 D Q=D/R
60 A 12 10 . E
3 . F
A 40 B 120
C 360 D 30
61 M ..
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A D & B F
C I D
62 O 2.5G
A GPR B EDGE
C CDMA2000 1R D I95
63 2G ?
A AC B GM
C GPR D IDN
64 P
A LED B P
C LAER D FE
65 O 1=1.4
2=1.05. I
A 0.926 B 0.8
C 0.35 D 0.15
66 N 28 1300 .
. ?
A 50 B 100
C 200 D 400
67 AFER+
?
A B B B
C B D MA
68 I M E I
(IMEI)?
A M C C B M N C
C E N D N
69 N ( N) .
A
B
C
D
70 D N ( N) .
A C B O
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C H D L
71 F , () :
()=1/2 1 1 ()=0 . M .
A 1/2 2/3 B 1 2/3
C 1 4/3 D 2 4/3
72 P G
A R B P
C G D R
73 .
A A B A
C A DA
74 A
A I B D
C P D E
75 I PCM ,
A B N
CF
D N
76 I PCM ,
A P B N
C F D H
77 F
A 20 H 20 KH B 500 H 10 KH
C 300 H 3.4 KH D 300 H 5 KH
78 R H F (HF)
A 330 MH B 30300 MH
C 3003000 MH D 330 GH
79 P
A M B M
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C D D
80 ?
A PPM B PM
C PAM D A
81 Q
A PM B PPM
C PCM D AM
82 ?
A PAM B PM
C PCM D AM
83 ?
A PM B PCM
C DM D ADM
84 I ,
A B
C D N
85 F , 32
A 4 B 5
C 8 D 32
86 I QAM
A A B F
C A P D B
87 I PCM , .
AH
B
C R D P
88 A 20 B 15 B
9 B.
B
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A 21.53 B 11.07
C 10.44 D 0.63
89 A 200 MH Q 10
10 F. 170C.
?
A 1 B 2
C 8 D 16
90 N B 3B
?
A BN > B3B B BN = B3B
C BN =0.5* B3B D BN = 0.5**B3B
91 N B 3B L
?
A BN > B3B B BN = B3B
C BN =0.5* B3B D BN = 0.5**B3B
92 (P)
500 MH 2.5 B?
A 0.5 B 0.557
C 1 D 1.557
93N 10. I
0.24105. C ..
A 2.6105 B 0.025
C 26105 D 6108
94 I ,
A B I
C I D D
95 10.
B 1 MH. A 270 C
A 0.40 B 1.28
C 0.16 D 1.19
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96
(5+10)
A E B
C R D N
97 P FM .
A H B
C P D H
98 I ..
A RF B M
C IF D D
99 M AM 0 1,
A I 100% B I 50%
C I 25% D D
100
?
A B B BC
C DBC D AM
101 F FDM ,
A AM B FM
C B D DBC
102 1 MH
100 .
?
A 990 KH B 1010 KH
C 1020 KH D 1030 KH
103 1 MH 100
.
?
A 990 KH B 1000 KH
C 1010 KH D 1020 KH
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104 I , 600
400 . M
A 0.25 B 0.5
C 0.75 D 1
105 C
0.2, 0.4 0.5 ?
A 1.1 B 0.67
C 0.55 D 0.25
106 AM 6 A. I 5 A
. ?
A 0.94 B 0.83
C 0.69 D 0.33
107 AM 1 K. I , 200 .
?
A 0.201 B 0.404
C 0.8 D 0.894
108 I ,
..
A N B L
C C C D H
109 FM 10 ,
A 3.33 B 10
C 30 D 10
110 B FM
A M B C
CM
D P
111 F IF
AP
B P
C D P
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112 F AM
A B P
C D PIN
113 IF FM ..
A 10.7 MH B 50 KH
C 100 KH D 200 KH
114 B
A BP
C RFC D P RC
115 F FM
A D B P
C R D PLL D
116 HF 900MH
.
AB 900 MH,
B
G P
900 MH.
C
L
D N
117 GM
A CDMA FDMA B FDMA DMA
C O FDMA D O DMA
118 LAN
A
L
B
CL
D
119 A IEEE 802.11 LAN 50
.
A 64 B 2 MBP
C 11 MBP D 54 MBP
120 GPR .
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AC
B
P
C D M
121 M
A384 2.048
M B
64 K 1 M
C2.1 MBP 8 MBP
D N
122 IEEE 802.16 MA .
A 2 MBP B 8 MBP
C 54 MBP D 75 MBP
123 B .
A B
C D
124 IEEE 802.15.1 B
A 512 B 800
C 1600 D 3200
125IEEE 802.11 LAN 2 MBP
D .
A BPK B QPK
C DQPK D QAM
126 10 LAN
2M .
A 2 MB B 2.5 MB
C 10 MB D 20 MB
127 IEEE 802.15.1 PAN
A D B OFDM
C FHCDMA D FHDMA
128 I ,
.
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A 1 B 10
C 100 D 500
129 CDMA .
A 16 B 32
C 64 D 512
130 D CDMA
A BPK B QPK
C DQPK D QAM
131CDMA .
A 2 M B 8 M
C 3.84 M D 16 M
132 CDMA
A LPC B RELP
C A CELP D DPCM
133 M EIRP III CDMA
A +23 B B +13 B
C +9 B D +3 B
134 A ,
A B
C D
135 M E/N ..
A P B B
C D A
136 CDMA I95
A FDMA B FH
C D D H
137 I D , 48 M 4.8 K,
P B
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A 4.8 B B 48 B
C 40 B D 60 B
138 I FH 500 MH,
5 KH. B?
A 5 B B 50 B
C 4 B D 40 B
139 E CDMA I95
A 200 KH B 600 KH
C 1.25 MH D 10 MH
140 O CDMA,
1 B
.
A 1 B 1.25
C 10 D 1.25
141 MAHO
A B
C D
142
?
A FK B QPK
C GMK D QAM
143 GM
.
A 1.25 B 120
C 4.615 D 125
144 M GM .
A 200 B 270.833
C 64 D 2 M
145 GM .
A 1 /H B 1.35 /H
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C 2 /H D 4 /H
146 G
A M IP BM
CM
D M
147 B C C (BCCH) B .
A F B C
C C D A
148 RF GM ..
A 3 B 4
C 8 D 16
149 B BC
A I B A
C A D D
150 2
8
A 3 B B 6 B
C 12 B D 15 B
151
AQ
B
N
C O D R
152
I
A 2 B 3
C 4 D 5
153 C 7
4. I
A 28 B 7
C 4 D 1.7
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154 C
A B
C C D C
155 ,
2
A 3 B 23
C 43 D 4
156 M 2 2. C
N=7. ?
A 3.5 2 B 7 2
C 14 2 D 143 2
157 10 7 . 16
. ..
A 1120 B 112
C 70 D N
158M 1000
. I 20
4. .
A 1000 B 5000
C 10000 D 20000
159 I ,
=2 =2 .
A 4 B 8
C 12 D 16
160 P
.
A , B ,
C , D ,
161 I ,
A R 6 B B R 3 B
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C R 12 B D N
162 I , 10.
3 B. EIRP .
A 10 B 20
C 30 D 3.33
163 PLL
A AM B FM
C PM D PCM
164 10 KH 11 KH
. O .
A 21 KH B 1 KH
C 210 KH D 1.1 KH
165 I FM , ..
A 3.4 KH B 5 KH
C 15 KH D 20 KH
166M FM 10 KH 20 KH,
A G B D
C I 20 KH D I 10 KH
167 I FM , /N
A B
C
D
P
168I 20 KH 50 KH.B FM C' .
A 40 KH B 90 KH
C 140 KH D 200 KH
169 F FM AM
A N B F
C C D
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170 A 1.536 128
. Q
A 0.12 2
B 0.012 2
C 0.0012 2 D 0.000012 2
171 PCM 30 ..
A 64 KBP B 2.048 MBP
C 4 MBP D 8 MBP
172 QR PCM 10
A 48 B B 56.8 B
C 64 B D 67.78 B
173 P
A DM B A DM
C A DM D N
174 PCM ,
A B
C D NR
175 F
A B DC
C F PD D
176 DC
?
A M B NR
C R D N
177 ?
A AK B BFK
C BPK D DPK
178 O NR ,
A N
PD
A 2A/N B 2A2/N
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C A D A/N
179 M DPK
A AND B OR
C ENOR D NAND
180I FK, 0
10 KH 1 25 KH.
.
A 45 B 50
C 200 D 250
181 F 8 ,
FK
A 32 KH 40 KH B 8 KH 12 KH
C 20 KH 40 KH D 16 KH 20 KH
182 AK, FK PK
A A B D
C A D D A
183 C
A A B M
C M D A
184 B QPK 100
A 800 B 400
C 200 D 100
185 I ,
.
A M B D
C D I
186
..
A R B
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CM
D B
187
A
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C 1000 D N
195 R . C
.
A H B D
C D F
196 I , ..
A 3 B B 6 B
C 9 B D 8 B
197M 4 16 . B
A 4 B 5
C 6 D 8
198 O M
A 5 10 B 2 5
C 1 2 D 1
199 M C/I
.
A 3 B B 6 B
C 9 B D 12 B
200 I 20 3
E .
A 6.66 B 30
C 60 D 360
201O .
A E B L
C C D A
202 B 1' 0'
0.01. C ...
A 0.9 B 0.909
C 0.99 D 0.92
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203 F ,
NR 30 B
A 64 KBP B 32 KBP
C 33.89 KBP D 16 KBP
204 I ,
.
A 8 B 4
C 1 D 0
205 PCM ?
A 8 B 4
C 1 D 0
206 A 1,2,3 4 0.5,
0.25,0.125 0.125 . A
1 2
A 1 1 2 B 2 1 2
C 1 1 2 2 D 2 1 1 2
207 ,
0.25
A 0.25 B 5
C 1 D 2
208 E 4 0.5,
0.25, 0.125 0.125
A 1 / B 1.75 /
C 2 / D 4 /
209 C 4 KH 15 B
NR A 4 B 8.02
C 20.11 D 32.40
210 I 1 ,
A 1 B 64
C 125 D 625
211 M (0,)
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A B ()
C () D /2(2)
212 I I
A
B
B
.
CB
D A
213
A R II B R
C R D N
214 E/N
. E=R N/2
.
A 0 B B 3 B
C 1.59 B D 1.33 B
215 RC 1000 F
10 ,
10 KH .
A 0.25 B 0.5
C 0.85 D 0.9
216 HD
A 4:3 B 16:9
C 9:16 D 3:4
217 A HD
A I 1080 B P 780
C B A B D N
218 I 1080 HD , ..
A 786 B 1280
C 1920 D 2400
219
A 1 MH B 40 GH
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C 100KH D 10 GH
220 F PPM PM
A A B DF
C M D
221 N
20H15KH 8
1 ?
A 1.2 MB B 1.8 MB
C 30 KB D 64 KB
222 D LPC10 ..
A 2.4 B 4
C 8 D 16
223 12
DPCM . ..
A 128 B 192
C 256 D 384
224 F
A L B H
C D A
225 HDMI C LCD/LED
A D C B C
C C D A
226 E ..
A R B B
C D A
227 G GMK
A
B
.
C II
D A
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228 F LPC10
A P B G
C D /
229H 40 ?
A 160 B 200
C 320 D 400
230F PPM
A L B B
C A D M
231 I PCM ..
A NR BL
CM
D A
232I PCM ..
A
B
C N D A
233 F R232
A R B
C C D DR
234 M PCM
16 4 .
A 0.0833 B 0.05
C 0.5 D 4
235 A
A R BR
C D D A
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236 D
A
P
B
I
C D A
237 F ..
AB
B
NR
C
B
D N
238 R C B
A NR = 7.78 + 20C B C=2B10(1+NR)
C C=2B2(NR) D C=B2(1+NR)
239 N
A B
C D P
240 10 DM
.
A 12.5 B 125
C 1250 D N
241N CCIRB
I
A 625 , 52 B 525 , 53
C 625 , 64 D 525 ,12
242 O DMA GM
A 156.25 B 114
C 57 D 26
243 O DMA GM
A 156.25 B 114
C 57 D 26
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244 F MC
A HLR B LR
C EIR D AC
245 E ..
A B C
C B D E
246 F
A PRMA B DMA
C FDMA D CDMA
247 A
A O B P
C D D
248 II DMA
A B C
C I D C E
249 I M , R=1/ R=1/
:
A =2M B =M
C =210M D R=R2M
250
A B
C 1
0D A
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1
x x E is
A . E - 2E B 2E - . E
C 2E + E D . E - E.
2Unit vector of E is
A E / E B E ( ax+ ay + az )
C E . E D E / E
3E x H is
A EH cos B EH sin C EH sin an D EH cos an
4E x ( A + C ) is
A E x C + E x A B E . A + E x C
C A.E + C.E D A x E E x C
5Gradient of a scalar is
A Not defined B A vector
C a scalar D Not periodic
6 Divergence of a vector is
A Not defined B a scalar
C A vector D The same as gradient of a vector
7 The unit of del is
A Does not exist B meter
C 1/meter D dB
82 operates
A Only on scalar B Only on vector
C On a scalar and also on a vector D Only on a constant
9 ax . ax is
A axB 1
C 0 D ay
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10ax . ay is
A
0
B 1
C az D -az
11 ax X ay is
A 1 B 0
C az D -az
12ax X ax is
A 0 B 1
C az D ay13
For static fields
A x H= D B x H= J
C x H= 0 D x H= E
14 In free space
A x E= 0 B x E= v
C .D= v D
x E= -B/tttt
15 Unit of Eis
A Volt B Amp/m
C Volt/m D Volt/coulomb
16Unit of His
A Weber B ampere
C Volt/m D Amp/m
17 Unit of Dis
A Wb/m B Amp/m
C C/m2 D C/m
18D is
A E B H
C H D E/tttt
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19 .DDDD/tttt is
A
sB v
C l D 0
20 x E is
A BBBB/tttt B ----BBBB/tttt
C DDDD/t + Jt + Jt + Jt + J D JJJJ
21 The electric flux density , D is
A E B E
C E /0 D E22
The electric flux is
A Q B D
C E D Q
23 The unit of electric flux is
A Weber B Gauss
C Tesla D Coulomb
24 In free space
A
. E= 0 B x E= 0
C .E= v D .E= v/ 0
25 In free space
A . B= 0 B . B= 0H
C x B= 0H D . B= H/ 0
26 For free space
A = 0 B J = 1 Amp/m2
C r = 0 D r= 0
27The unit of conduction current density is
A Amp/m B Amp/m2
C Amp/m3 D Amp
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28 The unit of displacement current density is
A Amp/m2 B
Amp/mC Amp D Amp-m
29 The unit of conduction current is
A Amp B Amp/m
C Amp/m2 D Amp-m
30 The unit of permittivity is
A Farad B Henry
C Farad/m D Henry/m
31The unit of permeability is
A Henry/m B Farad/m
C Henry D Weber
32 The conduction current density is
A E B D
C E/ D D
33 The displacement current density is
A EEEE/tttt B D
C D D 0E
34 For uniform plane wave propagation in z-direction
A Ez= 0B Ezf(y)
C Ezf(x) D Ez= 0 , Hz= 035
The line integral of E around a closed loop is
A Zero B Q
C Equal to current D v
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36 The unit of attenuation is
A
dB/m
B V/m
C Amp/m D Coloumb/m
37Velocity of a plane wave whose r= 4 , r = 1 is
A 3 x 108 m/s B 1.5 x 10
8 cm/s
C 6 x 108 cm/s D 2 x 10
8 cm/s
38 Velocity of uniform plane wave in free space is
A 3 x 108 m/s B 3 x 10
8 cm/s
C 3 x 106 cm/s D 3 x 1010 cm/s39
The unit of depth of penetration is
A dB B Meter
C Neper D radian
40E.H for a plane wave is
A Zero B 1
C Does not exist D EH
41 Equation of continuity is
A .J= -v/tttt B .J= -v
C .J= v/tttt D .J= s/tttt
42Magnetic current density is given by
A B B DDDD/tttt
C BBBB/tttt D ----BBBB/tttt
43 The unit of magnetic current density is
A Amp/m2 B Volt/m
2
C Amp D Amp/m
44Boundary conditions on Eis
A anX (E1 E2) = 0B Et1= Et2
C an . (E1 E2) = 0D an . E1= 0
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45 Boundary conditions on His
A Ht1= Ht2 B Ht1- Ht2 = Js
C anX (H1 H2) = JsD anX (H1 H2) = 0
46 Boundary conditions on Bis
A anX (B1 B2) = 0B an.(B1 B2) = 0
C an.(H1 H2) = JsD Bn1= Bn2
47 Boundary conditions on Dis
A an.(D1 D2) = 0B an.(D1 D2) = s
C an X (D1 D2) = s D an X (D1 D2) = 048
Boundary conditions on Jis
A an X (J1 J2) = 0B an .(J1 J2) = 0
C an X (J1 J2) =JsD an.(J1 J2) =Js
49 Lorentz Gauge condition is
A .A= - VVVV /tttt B x A = H
C x A = B D
.A= - VVVV/tttt
50 Equation of continuity is
A J.dS= I B J.dS= Q
C J.dS= J D J.dS= v51
Intrinsic impedance of a medium is given by
A Sqrt(/ ) B Sqrt( j/ (+j)
C Sqrt(/) D Sqrt()
52 The characteristic impedance of free space is
A 277 B 120
C 377 D 1202
53The wave equation in free space is
A 2E = 0 0EEEE /ttttB 2E = 0 02222EEEE /tttt
C 2V = - v/ D 2E = 2222EEEE /tttt
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54E and H are always perpendicular to each other
A
Yes
B Some times
C Only for uniform plane wave D None of these
55 Velocity of propagation of a plane wave is
A / B /
C / f D f /
56 Attenuation of plane wave in free space is
A Zero B infinite
C Propagation constant D itself57
A medium is a good conductor if
A (/ ) >> 1 B (/ ) > 1 B (/ )
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CInversely proportional to squareroot of conductivity
DNot a function of conductivity
63
Phase velocityof uniform plane wave is
A Directly proportional to B Inversely proportional to
CNot a function of
DNot Inversely proportional to
square root of 64
Phase constant of a uniform plane wave in a medium is
A Directly proportional to frequency B Not a function of frequency
CIs inversely proportional to
frequencyD
Is inversely proportional to
square root of frequency65 The characteristic impedance of a medium is
A Sqrt(/ ) B Is a function of frequency
C Not a function of frequency D Is independent of , and f
66Poynting vector gives
A Instantaneous power density B Average power density
C Total power D Total power density
67 Standing waves are produced when
A There are no reflections B There are full reflections
C There is only transmission DThe waves are incident on good
dielectrics
68 The minimum value of voltage standing wave ratio is
A 0 B -1
C 1 D -
69When the load impedance ZL= Z0 , the VSWR is
A 10 B 1
C 0 D
70 Brewster angle is
AAngle of incidence for whichthere is no reflection
BAngle of refraction for whichthere is no reflection
C Equal to reflected angle D Equal to refraction angle
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71 The range of HF is
A
3-30 kHz
B 30-300 kHz
C 3-30 MHz D 30-300 MHz
72 The range of VHF is
A 3-30 MHz B 30-300 MHz
C 300 MHz-3 GHz D 300 kHz 300 MHz
73 The standard antenna for reference is
A Isotropic antenna B Half-wave dipole
C Dish antenna D Yagi Uda antenna
74The most common popular prevalent TV antenna is
A Dipole B Monopole
C dish D horn
75 Among the following the Broadband antenna is
A Log-periodic B dipole
C Yagi-Uda D Horn
76 Among the following the non-resonant antenna is
A dipole B Yagi-Uda
C Monopole D rhombic
77 The common microwave link antenna is
A dipole B Log-periodic
C Rhombic D Parabolic dish
78Antenna for direction finding is
A Yagi-Uda B Rhombic
C Parabolic dish D Loop
79 The directivity of half-wave dipole is
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A 10 B 1
C 1.5 D 1.64
80The directivity of current element is
A 1.64 B 1.5
C 2.0 D 5.0
81 Reflectors in Yagi-Uda antenna are
A 1 B More than 1
C 3 D 10
82 Directors in Yagi-Uda antenna are
A More than 1 B 1
C 5 D 3
83 Radar antenna is
A Parabolic dish B dipole
C Horn D waveguide
84 The length of the folded dipole in yagi uda antenna is
A 468/f (MHz) feet B 492/ f (MHz) feet
C 342/f (MHz) feet D 192/f (MHz) feet85
The impedance of folded dipole in yagi-uda antenna is
A Inductive reactance B Capacitive reactance
C Purely resistive D 73
86 The radiation resistance of a current element is
A 80 2( dl / )2 B 80 ( dl / )2
C 80 2( dl / ) D 80 ( dl / ) 87
Circularly polarized antenna is
A Dipole B Parabolic dish
C Yagi-uda D helical
88 If the current element is y-directed , the resultant vector magnetic potential is
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A y-directed B x-directed
C
z-directed
D
-directed89For time-varying fields
A E= - V B EEEE = -V - AAAA /tttt
C EEEE = -V - DDDD /tttt D EEEE = -V - HHHH /tttt100 poynting vector gives
ADirection of electric field
BPolarization of electromagnetic
wave
C Power flow D Rate of energy flow
101 The length of folded dipole in yagi-uda antenna is
A Frequency dependent B Frequency independent
C Equal to D Equal to 0.2
102The spacing between folded dipole and reflector is
A B /2
C > /2 D < /2
103 Voltage standing wave ratio is
A Vmin/ VmaxB Vmax/ Vmin
C Vreflected / Vincident D Vmax
104Antenna is a
A transducer B filter
C Regulator D amplifier
105 The radiation resistance of a half wave dipole close to earth is
A 73 B < 73
C > 73 D Infinity
106If the directivity is high , the beam width is
A High B low
C constant D Very high
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107 Director in yagi-uda antenna is
A
Active element
B Driven element
C Parasitic element D Identical to dipole
108 Reflector in yagi-uda antenna is
A Active element B Driven element
C Identical to dipole D Parasitic element
109 Log-periodic antenna is
A Narrow band B Wide band
C Frequency independent D Frequency dependent
110In vertical dipole , the electric field is
A Parallel to the dipole B Perpendicular to dipole
C - directed D circular
111 The effective length of a vertical radiator is
AIncreased by capacitive hat
BIncreased by loading with lumped
Inductance
C Increased by supplying more power D Increased by resistance loading
112The null-to-null beam width in end-fire array is
A 2 / N d B Sqrt(2 / N d )
C 2 sqrt(/ N d ) D 2 sqrt(2 / N d )
113
The null-to-null beam width in broad side array is
A 2 / N d B 2 sqrt(2 / N d )
C 2 2/ N d D Sqrt(N d / 2 )114
The length of resonant dipole is
A /2 B
C /4 D 2 115
The first side lobe level in uniform array is
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A 0.212 B 0.121
C 0.312 D 0.51
116The side lobe level in binomial array is
A Zero B -13.5 dB
C -20 dB D Zero dB
117 In binomial array the central elements are excited
A strongly B Weakly
C Uniformly D easily
118 In horizontal polarized waves the electric field is
A Parallel to the ground B Perpendicular to the ground
C In -direction D Elliptical
119 The maximum directive gain of current element is
A 1.76 dB B 2.15 dB
C 3 dB D 0 dB
120 Band width of an antenna is
A f0/ QB Q / f0
C f0Q D f02/ Q
121 Antenna can be used as
A Sound sensor B Light sensor
C Temperature sensor D Colour sensor
122For far field of z-directed current element
A H= - sin AAAAzzzz/rrrr B H= 0
C H= H D H= Hr
123 Induction and far fields have equal magnitudes at
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A r = / 2 B r = / 6
C
r = / D r =
124Induction and radiation fields have equal magnitudes at
A r = v0/ B r = v0/ 2
C r = v0/ D r = v0/
125 If the output signal power level is 1 W , power gain is
A 0 dB B 1 dB
C 10 dB D dB
126 LF antennas are usually used for
A Vertical polarization B horizontal polarization
C Circular polarization D Elliptical polarization127 The real part of antenna impedance consists of
A Rr onlyB Rrand Rl
C Rl onlyD Zero ohms of resistance
128 Power and field patterns are related as
A P E2 B P E
C P E D P E129
For radiation pattern measurement the distance of the far field region is
A r > 2 D2/ B r < D2/
C r=/ D r=D/
130 GTEM cell means
AGeometric transverse
electromagnetic cellB Giga Hertz TEM cell
C Grounded TEM cell D Geo TEM cell
131 Whetastone bridge is used to measure antenna impedance at a frequency of
A Giga hertz B Upto microwave frequency range
C Upto millimeter range D Upto 30 MHz
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132If the field measurements are made at r < 2 D
2/
A
Side lobe levels will be high
B Bandwidth will be small
CBand width and side lobe levels are
smallD No side lobes appear
133Null-to Null bandwith is
A Equal to 3 dB bandwith B Greater than 3 dB band width
C less than 3 dB band width D Not related to 3 dB band width
134Antenna efficiency is
A gp/ gdB gd/ gp
C gp D gd135
Phase difference is
A B /
C Path difference x D / 136 If the response of a vertical dipole is 1 for a unity normalized input power , the
polarization is
A Vertical B Horizontal
C Circular D elliptical
137 If the response of RCP helix is zero , the polarization of test antenna is
A LCP B RCP
C Horizontal D Vertical
138If the response of RCP helix is maximum , the polarization of test antenna is
A LCP B RCP
C Horizontal D Vertical
139If the response of LCP helix is maximum , the polarization of test antenna is
A LCP B RCP
C Horizontal D Vertical
140If the response of a horizontal dipole is maximum , the polarization of test antenna is
A Horizontal B Vertical
C Circular D elliptical
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141 If the response of any type of antenna is 0.5 for unity normalized power, the
polarization of test antenna is
ALinear
B Horizontal
C Vertical D unpolarised
142The excitation levels of a three element binomial array are
A 1,2,1 B 1,3,1
C 1,4,1 D 2,3,2143
The excitation levels of a four element binomial array are
A 1,3,1,1 B 1,2,2,1
C 1,3,3,1 D 1,4,4,1144
The basic transmission loss between transmitter and receiver is
A 10 log ( ( 4 d )/ )2 B 10 log ( / ( 4 d ))2
C 10 log ( GTXGRX ) D zero
145Actual transmission loss between transmitter and receiver is
A 10 log { ( /( 4 d ))2 * 1/ ( GT
GR) }B 10 log { ( ( 4 d )/ )
2 * 1/ ( GT
GR) }
C10 log { ( ( 4 d )/ ) * GTGR}
D 10 log { ( /( 4 d ))* ( GT
GR) }146 Friss formula is
A La= ( / ( 4 d ))2 B La= ( ( 4 d )/ )2
C La= 10log10( ( 4 d )/ )2 * 1/ (
GTGR)D La= 10log10( ( 4 d )/ )2
147 Noise figure of antenna is
A Te/ T0B 1 + (Te/ T0 )
C 1 - (Te/ T0 ) D 1 + (Te/ T0 )2
148 Actual transmission loss in dB between transmitter and receiver is
AGreater than basic transmission
lossB
less than basic transmission loss
C Equal to basic transmission loss D infinite
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149 Schelkunoff polynomial method gives
A
Nulls in the desired direction
B Nulls in undesired directions
C Desired side lobes D Desired beam width
150 Range of VSWR is
A 0 to 1 B 1 to
C 0 to D - to 151 Tchebyscheff polynomial method gives
A Desired side lobe ratio B Desired beam width
C Desired overall pattern D Desired phase function
152The advantage of uniform linear array is
AThe required number of sources
is oneB SLR is small
C Number of side lobes are less D Grating lobes are present
153 The current distribution in half-wave dipole is
A Sinusoidal B constant
C Triangular D parabolic
154When the array length high, the null to-null beam width is
A Small B High
C Constant D infinity
155Conducting properties of earth are
A Constant with frequency B Change with frequency
C Change with the type of antenna D Change with excitation of antenna
156 In conductor , if charge is not moving , the radiation is
A Very high B Zero
C The same as when charge moves D moderate
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157 If a charge is moving with a uniform velocity in an infinite straight wire , the
radiaton is
AInfinite
B Moderate
C Zero D high
158If the charge is moving in a curved wire , radiation
A Exists B Does not exist
C Is infinite D Same as when the wire is straight
159If the charge oscillates with time in a straight wire , it
A Radiates B Does not radiate
C Stores energy D oscillates
160If the charge accelerates , there exists
A No radiation B Radiation
C Stored energy D Acceleration of antenna
161If the charge deccelerates , radiation
A Is zero B Exists
C Does not exist in any antenna D Exists only in some wire antenna
162 The primary equation for electromagnetic radiation in a very thin z-directed wire of
length L
A L dIz/ dt = L LazB L dIz/ dt = L Lay
C L dIz/ dt = LayD L dIz/ dt = L L
163Radiation with broad frequency spectrum is very strong if
A pulses are of shorter duration B pulses are of longer duration
C Pulses have more amplitude D Pulses have small amplitude
164For frequency independent antennas , the band width is
A zero B
C Finite D Moderate
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165 The radiation intensity of an isotropic radiator is
A
Pr/ 4 r2
B
Pr/ 4 rC Pr/ 4 D Pr
166 An omni directional antenna from the following
A Parabolic dish B Dipole
C Horn D Yagi-uda antenna
167 Loop antenna is a
A Isotropic radiator B Directional radiator
C Omni-directional radiator D Point source
168Broad side arrays are
A Omni-directional B Point sources
C Directional antennas D Isotropic antennas169 In linear polarization , there exists
A Three components B Only one component
CTwo components differing by 90
0phase
DTwo components differing by 270
0phase
170 If there exists two orthogonal linear components which are in time phase,
polarization is
A Linear B Circular
C Elliptical D Not present
171 Effective area of an antenna is
ARatio of power delivered to load
to power density of incident waveB
Ratio of radiation intensity to
power density of incident wave
C gp/ gd D gd/ gp
172 Aperture efficiency , aof an antenna is
AThe ratio of gp and gd
BMaximum effective area to physical
area
C Effective area to physical area D Physical area to effective area
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173 In far-field region , the angular field distribution is independent of
A
Transmitter power
B Distance from the antenna
C Angular region D Antenna type
174 Fresnel region is
A Far-field region B Near-field region
C The region of constant field D The region of no field
175 Fraunhofer region is
A Far-field region B Near-field region
C The region of constant field D The region of no field
176Reactive near-field region exists when
A R > 0.62 * sqrt( D3/) B R < 0.62 * sqrt( D2/)
C R < 0.62 * sqrt( D3/) D R > 0.62 * sqrt( D2/)177 Fresnel region exists when
AR 0.62 * sqrt( D3/)
BR 0.62 * sqrt( D /) and R 2D2/ B R < 2D2/
C R 0.62 * sqrt( D3/) D R 0.62 * sqrt( D3/)
179Unit of directivity is
A Watts B Watts/m2
C Watts/m3 D nil
180 Unit of solid angle
A Degrees B Radian
C Sterradian D nil
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181 If h is the height of an antenna , the number of side lobes are
A
h/ B 2 h/
C 4 D 2 / h
182 Divergence factor of a field from earth is
A
Reflected field from flat earth /
reflected field from curved
surface
B
Reflected field from curved
surface / reflected field from flat
surface
C
Reflected field from curved earth
/ incident field from curved
surface
D
incident field from curved earth
/ reflected field from curved
surface183 If Rris radiation resistance , eis effective permeability of ferrite core , the
radiation resistance of ferrite loop is
A Rr (0/ e)2 B Rr (e/ 0)
2
C Rr D Rr 0
184 The resultant field of an array antenna is
AThe product of element pattern
and array factorB Array factor
C Sum of element patterns D Element pattern
185The excitation required to orient a beam in 0direction is
A kd cos 0B -kd cos 0
C -kd D kd
186 Super directivity of an array can be obtained by
A Reducing the spacing B Increasing the spacing
C Reducing the number of elements D Decreasing array length
187 Super directivity obtained by reducing the spacing and increasing the number of
elements results in
A High reactive power and Q B low reactive power and Q
C Small Q DHigh reactive power and lower
Q188
Circular antennas are most sensitive to
A Linearily polarized waves B Elliptically polarized waves
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C Circularly polarized waves D Unpolarised waves
189Circular antenna has usually a length of
A / 2 B
C 2 D / 4
190 The horizontal pattern of a circular antenna is
A Circle B Four equal lobe pattern
C Figure-eight pattern D Six equal lobe pattern
191Two end fire circular antenna elements with 90 phasing produce
A Unidirectional pattern B Figure eight pattern
C Multidirectional pattern D No radiation pattern
192Cirular antennas are widely used at
A VLF B HF
C Microwave frequency D UHF
193 Directors in yagi uda antenna
A
Reduces the characteristic
impedance of a driven antennaelement
B
increases the characteristic
impedance of a driven antennaelement
CHas no effect on the characteristic
impedance of driven elementD Act as open circuit
194Directors and reflectors are used to
A Reduce the impedance B increase the impedance
C Increase the gain D Form an array
195 Due to use of parasitic elements the bandwidth of yagi-uda antenna is
A Increased B Not affected
C Made ideal D Limited
196Yagi-uda antenna has
A Poor front to back ratio B good front to back ratio
C infinite front to back ratio D zero front to back ratio
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197 V-antenna yields
A
Bidirectional pattern
B Unidirectional pattern
CGood signal strength compared to
dipoleD Less band width compared to dipole
198V-antenna is popular for
A Satellite reception B FM reception
C Mobile reception D Radar signal reception
199If the power gain of an antenna is 0.5 dB , the power ratio is
A 0.216 B 12.6
C 1.26 D 1.06
200If the voltage gain of an antenna is 1.0 dB , the voltage ratio is
A 1.26 B 0.126
C 1.06 D 1.0
201If the power gain of an antenna is 30 dB , the power ratio is
A 1.477 B 1000
C 100 D 10
202If the power gain of an antenna is 20 , the power gain in dB is
A 13 B 130
C 20 D 200
203If a dipole is tilted forward , the band width becomes
A Zero B Infinite
C More D reduced
204 If a 300 line is terminated in 75 dipole , SWR is
A 4 B 0.25
C 8 D 2
205The power density at a distance of 1 km from 1 kW isotropic radiator is
A 795 mW / m2 B 79.5 mW / m
2
C 795 W / m2 D 79.5 W / m2
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206 For radio wave propagation , fresh water is considered to be
A
Very poor
B Poor
C Very good D average
207 For radio wave propagation , cities are considered to be
A Poor B Very poor
C Very good D good
208The phase velocity of a wave in medium whose r = 0 is
A B 0
C Finite D V0
209Antenna radiation efficiency is high when its length is
A / 2 B
C 3 / 2 D 210 Antenna resonates when its length is integer multiples of
A B / 2
C / 4 D / 3
211 For a 100 antenna with 2 A of current , radiated power is
A 400 watts B 200 watts
C 50 watts D 25 watts212
For a perfect conductor the power transmission coefficient is
A 1 B zero
C D Reflection coeeficient
213For a perfect conductor , the power transmission coefficient ||2 is
A Equal to transmission coefficient B 1 T
C 1 D 0
214 The Rayleigh criterion in the case of reflection of electromagnetic wave from semi-
rough surface is
A Cos i > / 8dB Cos i = / 8d
C Cos i < / 8dD Cos i = 0
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215 The percent bandwidth of an antenna with an optimum frequency of operation of 500
MHz and - 3 dB frequencies of 300 MHz and 350 MHz is
A20 %
B 100 %
C 500 % D 10 %
216 The received power of a receiving antenna whose effective area is 0.2 m2for an
available power density of 100 W / m2
A 200 B 20
C 50 D 500
217For an ideal antenna , the directivity is
A Power gain B 1
C 1.64 D 1.5
218 For an ideal antenna , the radiation resistance is
A 73 B 36.5
C 293 D Input impedance
219 The power gain in dB of isotropic radiator is
A 0 B 1
C 1.5 D 1.64
220The normalized power of a dipole is
A 1 B 1.5
C Sin2 D 1.64
221 If the resistance part of antenna is 100 , radiation resistance is 80 , the antennaefficiency is
A 0.8 B 10/8
C 0.4 D 8/18
222 If is the angle between the axis of a receiving dipole and the direction of electricfield , the polarization loss factor is
A Sin B cos
C tan D sec
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223 The effective length of a half wave dipole is
A
0.4 B
0.45 C / D 0.55
225 Effective area of a Hertzian dipole is
A 0.2 2 B 0.25 2
C 0.119 2 D 0.3 2226 Directive gain is equal to power gain if
A = B = 1
C = gp D = gd227
Directive gain and directivity are equal for
A Directional antenna B Dipole
C Parabolic dish D Isotropic antenna
228For an isotropic antenna operating at = sqrt(4 ) , the effective area is
A4 B 1
C(4 )2 D 2
229 Directivity is
Ainversely proportional to beam width
Binversely proportional to square of
beam width
C Directly proportional to beam width DDirectly proportional to square of
beam width
230 If the direction of propagation of an electromagnetic wave is in z-direction , the
polarization is in
A z-direction B y-direction
C x-direction D Circular polarization
231 If the quality factor of an antenna is 1000 , resonant frequency is 10 MHz its bandwidth is
A 100 kHz B 10 kHz
C 10 Hz D 10 MHz232 The maximum effective area of an antenna operating at = 10 cm with the
directivity of 100 is
A 1000 cm2 B (1/4 ) m
2
C 4 m2 D 10 m2
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233 The radiation resistance of an antenna which radiates 10 kW when a current of 10
ampere flows in it , is
A100
B1,000
C 10 D 100 k234 When an antenna radiates 10 kW in forward and 1 kW in backward directions , the
front-to-back ratio of an antenna is
A 1 dB B 10 dB
C 100 dB D 0 dB
235If a medium has r = 81 , = 2 mho/m , f = 10 GHz , it is
A A conductor B A bad conductor
C An insulator D A good insulator
236The radiated electric field is
A dl B (dl)2
C 1/ dl D 1/(dl)2237 Poynting vector has the unit of
A Watts / m3 B watts
C
Watts / m
2
D Volt-ampere
238 The current element has a directive gain of
A 3 / 2 B 2 / 3
C 1 D 1.64
239The polarization of horizontal dipole is
A Vertical B Horizontal
C - polarization D elliptical
240To receive horizontally polarized wave , the receiving antenna should be polarised
A Vertically B Horizontally
C Circularly D Elliptically
241The skin depth of an ideal conductor is
A B Zero
C Finite D Sqrt()
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242 The conducting properties of a medium depends on
A
OnlyB only
C f only D , and f
243 The surface current density of a good dielectric medium is
A Zero B Infinity
C Finite D - 1
244 The surface charge density of a good dielectric medium is
A -1 B Infinity
C Finite D Zero
245In the boundary condition Dn1- Dn2 = s, the unit of s is
A C / m3 B C / m2
C C / m D C246
In the boundary condition Ht1 Ht2= Js, the unit of Js
A Ampere B Amp/m
C Amp/m2 D H/m
247 In the boundary condition Bn1- Bn2 = 0 , the unit of Bn1 is
A Wb B Wb/m
C Tesla/m D Wb/m2
248In the boundary condition Et1 Et2= 0 , the unit of Et2 is
A Volt/m2 B Volt/m
C Volt D Volt-m
249H is
A x E B B /
C . BBBB D P / E
250The permittivity of a space is
A 1 B 0
C > 1 D
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251 The electric field of a circularly polarized wave is represented by
A
( ax+ j ay) e
j ( t - z )
B
( ax+ j ay) e
j ( t )
C ax e
j ( t - z ) D ayej ( t - z )
252 A qurter wave line yields
A Zero impedance B Infinite impedance
C Impedance inversion D Real and reactive impedance
253 The tangential electric field at a perfect conductor is
A 1 B
C Zero D - 254
An electromagnetic wave when incident on a perfect conductor is
A Reflected completely B Transmitted completely
C Reflected and transmitted D Refracted completely
255 The electric field of elliptically polarized electromagnetic wave is represented by
A ( ax+ j ay) ej ( t - z ) B ( Exax+ j Eyay) e
j ( t - z )
C Exax ej ( t - z ) D Eyay e
j ( t - z )
256 The transmission line can be converted into
A A dipole antenna B A dish antenna
C A horn D lens
257The length of the mobile antenna is a
A B /2
C /4 D >
258E.H of uniform plane wave is
A EH B 0
C E2 D None of these
259For static magnetic field
A X B= B X B= J
C . B= 0J D X B= 0
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260 Electric field in free space
A
D/ 0B D/ 0
C 0D D /0
261 For uniform plane wave in x-direction
A Ex= 0B Hx= 0
C Ex= 0 and Hx= 0D None of these
262 Displacement current density is
A D B J
C D/t D J/t263
Depth of penetration in free space is
A B 1/
C 0 D None of these
264 Complex pointing vector Pis
A P= - E x H* B P= E x H*
C P= E x H* D None of these
265 The time varying field is
A E= - V B E= - V -A/t
C E= - V -B D E= - V - D
266Uniform plane wave is
A Longitudinal in nature B Transverse in nature
C Neither transverse nor longitudinal D Vertically directed
267 The direction of propagation of EM wave is obtained from
A E x H B E.H
C E D H
268An electromagnetic field can exist if it satisfies
A Gausss law B Faradays law
C Coulombs law D All Maxwells equations
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269 If = 2.0 mho/m , E=10.0 V/m , the conduction current density is
A
5.0 A/m
2
B
20.0 A/m
2
C 40.0 A/m2 D 20 A
270 Maxwells equations give the relations between
A Different fields B Different Sources
C Different boundary conditions D None of these
271 The velocity of EM wave is
A Inversely proportional to B Inversely proportional to
C Directly proportional to D Directly proportional to 272
Velocity of a wave in a good conductor is
A Very small B Very large
C Moderate D None of these
273 If E = 2 V/m , of a wave in free space , (H) is
A 1 / 60 A/m B 60 A/m
C 120 A/m D 240 A/m
274If wet soil has = 10-2 /m , r=15 , r= 1 , f = 60 Hz , it is a
A Good conductor B Good dielectric
C Semi conductor D None of these
275If wet soil has = 10-2 /m , r=15 , r= 1 , f = 10 GHz , it is a
A Good conductor B Good dielectric
C Semi conductor D Semi dielectric
276 The cosine of the angle between two vectors is
ASum of products of the directionsof the two vectors
BDifference of products of thedirections of the two vectors
CProduct of products of the
directions of the two vectorsD None of these
277 The electric field intensity E at appoint (1,2,2)due to (1/9) nc located at (0,0,0) is
A 33 v/m B 0.333 V/m
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C 0.33 V/m D Zero
278If E is a vector , then . x EEEE is
A 0 B 1
C Does not exist D None of these
279The Maxwells equation .B = 0 is due to
A B= H B B= H /
C Non existence of a monopole D None of these
280 Velocity of EM wave in free space is
A Independent of f B Increases with increase in f
C Decreases with increase in f D None of these
281The direction of propagation of EM wave is given by
A The direction of E B The direction of H
C The direction of E x H D The direction of E.H282 For uniform plane wave propagating in z-direction
A Ex= 0B Hx= 0
C Hy= 0 , Ey= 0D Hz= 0 , Ez= 0
283For free space
A = B = 0
C J 0 D None of these
284 Velocity of propagation of EM wave is
A Sqrt(0 / 0 ) B 0 / 0
C 1/sqrt(0
0) D
0/
0
285 Electric field for time varying potentials
A E= - V B E= - V - A
C E= V D E= - V + A
286The intrinsic impedance of a medium whose = 0 , r= 9 , r= 1 Is
A 40 B 9
C 120 D 60
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287 For time varying EM fields
A
x HHHH = J= J= J= JB
x HHHH ==== D/t + JD/t + JD/t + JD/t + JC x EEEE = 0= 0= 0= 0 D None of these
288The wave length of a wave with a propagation constant = 0.1 + j 0.2
A 10 m B 20 m
C 30 m D 25 m
289 The electric field just above a conductor is always
A Normal to surface B Tangential to source
C Zero D 290
The normal components of Dare
AContinuous across a dielectric
boundaryB
Discontinuous across a dielectric
boundary
C Zero D
291 An antenna is a synonyms to a
A Generator B Transformer
C Regulator D Reflector
292A unipole is also known as
A Omnidirectional radiator B Unidirectional director
C Line radiator D None of the above
292The directive gain of an antenna is given by
A
Radiation intensity in a particular
direction / maximum radiatedpower
BAverage radiated power/maximum
radiated power
CRadiation intensity in a particular
direction / average radiated powerD
Average radiated power / radiation
intensity in a particular direction
293 The numeric value of directive gain may lie between
A - 1 And + 1 B 0 and 1
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C 0 and D 1 and
294Which of the following constitute the loss resistance of an antenna ?
A Dielectric loss B Leakage loss in insulation
C Loss in earth connection D All of the above
295 In case of antenna the ratio of the power radiated in desired direction to the powerradiated in the opposite direction is known as
A Transmission efficiency B Front to back ratio
C Loss coefficient D None of the above
296 Front-to-back ratio can be increased by
A Sacrificing gain B Increasing the size of conductor
CUsing the materials of high
conductivityD All of the above
297A half wave dipole used at a frequency of 300 MHz has a length of
A 10 m B 3 m
C 1 m D 50 cm
298A vertical earthed antenna is resonant when its physical height is equal to
A
B /2
C /4 D /8
299A folded dipole antenna is conveniently connected to
A Shielded line B Two wire line
C Coaxial line D Flat ribbon type transmission line
300The bandwidth of an antenna is
A Directly proportional to Q B Inversely proportional to Q
C Directly proportional to Q2 D Inversely proportional to Q
2
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1. F
A F T B F S
C L T D Z
2. Z
A 1 B 0
C D 1/
3. D F T
A D F
B C
C C
D N
4. C
A B
C D
5. 2 H . W
?
A 4 B 0.25
C 2.5 D 5
6. D
A
B
C
D N
7. F /
A F B I
C W
D N
8. F
A P B A
C Q D A
9. F ,
A ()=0 0
C ()=1 0
10. F LTI , (), () () ,
, ?
A ()=() () B ()=()*()
C ()=() () D ()= ()()
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11. L
A C B D
C B
D N
12. U ,
A V B
C M D
13. T L
A 1/ B 1/(+)
C /(+) D /(+)
14. T
A A B S
C O D S
15. F F
A S
WN
B P WN
C B
WN
C A WN
16. A
A N B A
C A
D N
17. T
A A B A
C A
1
D N
18. T
A 1 B 0
C D
19. T /
A H 2 ,
,=1,2,3,4
B H
C H /2 D H 2 ,
,
,=(+/) 1,2,3.
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20. T
A S/ B X
C / D X+
21. T
A T B G
C S D N
22. F ,
A L B F
C D H
23. T F
A B C
C S D O
24. T F
A O B E
C C D S
25. A
A A B A
C M
D I
26. T F 2/
A S B C
C S () D ()
27. T (/4)(1)
A 1/8 B 8
C 4 D 1/4
28. T
A P B N
C C D E
29. P
A L B N
C B
D SECOND ORDER SYSTEM
ONLY
30. F (), F()=
A 1/ B 2/
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C D 2
31. I LPF
A N B C
C FIR D U
32. ()=(M)
A B
C D
33. I () , F
F
A B
C D
34. I () , F
F
A B
C D
35. A
A ()=() B ()=()
C ()=() D N
36. O
A 1 B
C +1 D 1
37. M
F ?
A T B F
C D
38. D F /
A F B I
C P D P
2
39. F
A S
B I
C T
D N
40. I () , F()
A B V*
C V/ D V*2
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41. U
A A
B A
C A
D P
42. E N ,
,
A F B S
C M D A
43. R
A L B H
C N D B
44.
T ()=(1)
A 6 B 4
C 2 D 1
45. T F ()=
A A B A
C A D A
46. T T
A T.
B 2T.
C
T.
D
2T.
47. T F T = T
/ 2 = +T / 2
A . B .
C . D .
48. T ( ) = ( )+
A L B L >0
C L
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C 3 H D 4 H
51. T 1 () 2 () 2 () = 1 ( ). I
, ROC
A T B R
C N D C
52. T F (FT) () X (). T FT
( )/ A X()/ B 2 X( ).
C X() D X( )/( ).
53. I F ()
A 0.5 ()+1/() B ()+1/()
C 0.5 ()+1/(2) D ()+1/(2)
54. T () = () . T BIBO
A B A
C >1 D
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C 3 D 4
60. M (/)
A B /2
C 2 D /4
61. T
A U B R 1
C D R
62. I () T ()=( + T/2) ,
F ,
A
.
B
.
C
.
D
.
63. A
A A B A
B A D A
64. F , ROC
A E B I
C R D U
65. F , ROC
A E B I
C R D U
66. F , ROC
A E B I
C R D U
67. F
A B F
C I D DFT
68. I , =1
A A B A
C A D A
69. T ROC
A B
C P D
70. D F
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A T B P
C F D A
71. I , ()X(), ()
A X()/ B X()/
C D X()/
72. I N DFT,
A N
B 2N
C N/2
D N2
73. C
A L B P
C S D N
74. I ()=1,1,1,1, 4 DFT X(0)
A 0 B 4
C 1 D 2
75. DFT
A S DTFT B I DTFT
C S DTFT D S
76. T () () ( ), > 0
A B 1/
C 2 D 0.5
77. I () ,
A U B
C E D
78. F DTFT , ROC
A U B
C P (1,1) D N
79. T ROC
A A B A
C U D E
80. F ,
A B
C R/ D D/
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81. F ,
A B 0
C 2 D /2
82. P DTFT
A 2 B
C /2 D /4
83. I ()=(200 ) T=1/400 ,
()=
A S(/2) B S(/4)
C S (/8) D S (/2)
84. D T F T
A P
B A
C P
D A
85. T LTI ()=4()
A B
C N D FIR
86. T (/3) (4000 ) , T
A 1200 B 12000
C 120 D 12
87. I ()=(()),
A B N
C LTI D N
88. T
A B C
C P D E
89. A
A C B N
C C D C
90. A
A F B F
C D D F T
91. I
A ()=() B ()=(+)
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C ()=() D ()=()
92. DTFT
A S DFT B I DFT
C D DFT D N
93.
A C
B I
C I
D A
94. T ,
A B
C C D N
95. DFT
A E
B S
C F D A
96. D DFT
A G
B L
C E H
D
97. N. DTFT
A B
C N D 2N
98. DFT
A R B I
C C D I
99. DTFT
A C B C
C C
D C
100. FFT
A DFT B DTFT
C DFT
.
D
101. I , K
A R B C
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C L D 1/C
102. M
A R
B R
C R
D N
103. I ,
A B M
C E D
104. T
A B
C D V
105. A
A A
B A
C A
D A
106. I ,
A T
B T
C T
D N
107. W ?
A B
C D P
108. W ?
A B
C D B
109. F I ,
A 0 B 1
C D 1/K
110. F I ,
A 0 B 1
C D 1/K
111. F 0 ,
A 0 B 1
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C D 1/K
112. T 180
A P
B S
C F
D G
113. T . T
A V B
C V D
114. A
A G B G 1
C G 1
D G
180
115. I
A R B M
C B A B D N A B
116. T
A T B T
C T D T
117. A
. T
A B
C M D H
118. A
A S
B I
C I
D N
119. T
A S
B S
C M
D N
120. I , G()H()
A E
B O
C O
D T
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121. I ,
A L B E
C A
D N
122. I ,
A A
B A
C A
D A
123. T
A U
B D
C R D C
124. I ,
A B
C V D
125. F ,
A B
C D
126. T
A U
B D
C B A B D N
127. I ,
A 1 B M 1
C L 1 D
128. T
A H B B H B
C H B
D H B
129. A 1 98%
. I ,
A 1 B 0.5
C 0.25 D 0.1
130. A
A H B L
C B D B
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131. A
A V
B L
C H D N
132. PID
A P I
D
B P I
D
C A 3
D A 3
133. T
A S
B T
C 3 D S
134. O
A A B S
C I D N
135. N
A C B C
C M
D N
136. A ,
A G B G
C M
D D
137. T
A N B N
C B D R
138. M
A V B P
C C D F
139. R
A H B P
C E D N
140. I
A F B T
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C F D H
141. T
A B B B
C D
D D
142. I ,
A 1/ B
C 2 D +A
143. I ,
A D B N
C B
D N
144. I ,
A P B I
C N D
145. T G()=1/[(1+)(1+2)
A D B C
C C
=0.7 /
D C =1.4
/
146. A , 1/(1+T)
A 90 B 90
C 45 D 45
147. I B ,
(1+T)
A 20 B/ B 10 B/
C 20 B / D 10 B/
148. A
A O
B T
C T
D Z
149. A 12 2 . I
A 200 B/ B 240 B/
C 280 B/ D 320 B/
150. M
A N
B I
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C C
D A
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1 A 300 K
= 0.21 0.18 .
A 0.69 B 0.83
C 0.61 D 0.88
2 A = 300 K ND = 1014 3 NA=10
173.
A 0.63 B 0.93
C 0.026 D 0.038
3 A . ,
90% ,
A 59.6 B 2.7
C 30.4 D 12.0
4 A = 300 K N A
=10173 ND= 5 10153, F
A 0.1 B 0.2
C 0.3 D 0.4
5 A .
, 9,
A 83 B 59
C 43 D 31
6 A
A B
C D
7 I ,
A
B
C
D
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8 I ,
A B
C ( )/2 D ( )/2
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9 (
K)
A B 1.5
C 2 D 1/
10 (
K)
A B 1.5
C 2 D 1/
11 I
/
A 2.5 / C B 2.5 / C
C 25 / C D 25 / C
12 I
A B C D 1
13 I
A B C
/ D
1
14 I C ( )A B C
1 D 15
A ln B ln
C
ln D
ln
16 FE
A
B
C
D
17 %
A + 100% B 100%
C 100% D + 100%
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18 A
2 B 2C
D
2
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19 A
2 B 2C
D
2
20 A
2 B 2C
D 2 21
A2 B 2
C
D
2 22 (F) A 0.406 B 0.286
C 0.693 D 0.512
23 (F)
A 0.406 B 0.286
C 0.693 D 0.512
24 ()
A 1.41 B 0.48
C 1.11 D 1.21
25 ()
A 0.48 B 0.68
C 0.28 D 1.21
26 ()
A 23.1% B 40.6%
C 46.1% D 20.1%
27 ()
A 68.1% B 81.2%
C 40.6% D 92.1%
28 I ,
A
/2 B
C 2 D 3
29 F .
= 0. C
.
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A B
C D
30 F .
= 0. C
.
A B
C D
31 I , 1 2 .
A 0, 4 A B 4 A, 0
C 0, 8 A D 8 A,
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32 F . A = 0.
A B
C D
33 I ,
0.6 . ON
A 1 B 2
C 1 2 D
34 F , = 0. 4 . ,
A 6.25 B 12.50
C 25 D N
35 I
A 1.4 A B 2.3 A
C 1.8 A D 2.6 A
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36 A
A B
C
D
37 I ,
A 100 A0 B 0.1
C 1 D 5
38 I ,
A 1 103 B 1 105
C 1 107 D 1 109
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39
A B
C
D
40 I ,
( )A B 1C
1 D 141
A B
C D
42
A
B
C
D
43 A 250 C, 2 , 500 C
A 2 B 1
C 2 D 2
44 ON FE :
A B
C
D
45 D FE A 1
B 1
C 1 D 1 46 FE
A 2 1 B 2 1
C 2 1 /
D . /
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47 I JFE
A 1 B 10
C 10 M D 100 M
48 M JFE
A B
C D
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49 I N ,
A B
C
D
50 A ,
A B
C D
51 :
( B E )
A = 1 B 1C
1 D = 552 I BJ , ,
A B
C D
53 BJ
A 0.01 B 1
C 100 D 10
54 I BJ , A
1 + B 1 C
1 + D 1 55 I BJ
( E C )
A
B
C
D
56 I BJ, = 1 = 0.99 A 0.01 B 0.1 C 1 D 100
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57 I BJ, = 0.98 A 49 B 98
C 0.49 D 980
58 I BJ, = 100 A 99 B 0.99
C 1.0 D 1.01
59 I BJ,
A 10 B 100
C 1 D 1
60 I
A B
C D,
61 I BJ, (E) , (B)
(C)
A E > C > B B B > C > E
C C > E > B D E = C > B
62 BJ
A , B ,
C ,
D
,
63 EM CB A = + B = + C = + / 1 D = + / 1
64 , 1 A ,
CE :
A = 100 = 10 = 50 = 1 B = 5 = 10 = 200 = 20 C
= 5 = 0 = 20 = 3 D = 100 = 10
= 100 = 10 65
E . H,
A B
C
D
66
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A
B
C
D
67
BJ
A
B
C
D
68 A IC 110 .
A I B MI
C LI D LI
69 I JFE , ,
A = B = C = . D = .
70 JFE A 1 B 1
C 100 D 1000
71 JFE A 1 B 10
C 500 D 100 M
72 MOFE A 10 B 500
C 10 M D 100 M
73 MOFE
A 0.01 B 1
C 10 D 100
74
A JFE B BJ
C MOFE D
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75 JFE
A B
C
D
76 FE
A B
C D
77 ED
(E )
A NN B N
C JFE D MOFE
78 A (FE)
A B
C
D
79 FE
A = 0 = 0 B = = 0C =
= 0 D 80 I MOFE A B
C
D
81 I BJ
A B
C
D
82 A BJ
A
B
C D
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84 F JFE
( )
A
B
C D
85 A MOFE
A 2 B 3
C 4 D 5
86 F MOFE,
A B
C
D
87 C :
( MOFE 1. 2. 3. I
O
A 3 B 1 2
C 1 3 D 2
88 ( MOFE A
B
C
D
89
A B
C D
90 CE
A B + 1C
1 + 1 D + 191 CE
A + 1 1 + + 1 + B + 1 + 1 +
C1 +
+ 1 + D
+ 1
+ 1 +
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92 ( = = A = B = C = D = 93 I CE , A =2 B >2 C
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101
A CB B CE
C CC D
102 C
A1 + B 1 +
C1 + D 1 +
103 C
( )A B C
D
104
A
B
C
D
105 O CC
A CE CB
B
C CE CB
D
106 I CC
A
B
C D
107 I CE , A
B
C D 108 I CE ,
A B + C / D /
109 I CE ,
CC
A 3 B 100
C 1000 D 0.01
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110 CE 1 2 A
2+ B + C + D + 111 A
B 2C
2 D 112 I CE ,
A
B
C
D
113 A A B
C,
D
,
114 I AB ,
A B
C L D
115 I C CE ,
A B
C
D
116 I C CE , 3B
A
B
C
D
117 3B
A2 1 B 2 1
C
D
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118
A B
C D
119
A C B D
C D I
120 I
A
B
C D
121
A CA B CB
C CC D CAB
122
A CA B CB
C CC D CAB
123 C ,
A
B
C
D
124 I C ,
A B
C D C
125 I ,
A B 1 C 1 + D 11 +
126 I ,
A
B
C
D
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127 FE
A B C
C D C
128 BJ C
A1 B 3 16 + 4
C1 129 D 1 16 + 4
129 I BJ C
A B 1 .
C 1 + .
D 1 .
130 F BJ C 3
C , ( = )A > 29 B >4 + 23 + 29C >4 + 29 D >23 + 29
131 F
A L B
CM
D D
132 I , 0.2 .
A 6 B 8
C 6 D 8
133 C , I = 2 ,
A 4 B 6
C 3 D 6
134 F OA B
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A B
C G D
135 F OA ,
A 2 B 1
C 0.5 D 0.5
136 F BJ , = 0.7 . BJ
A B
C D
137
A B
C D
138 F = = 50.
A 0.9 B 1.19
C 2.14 D 2.84
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139 555
A 0.69 + 2. B 0.69 + . C
0.69 . D
1.44
140 F 555
A 1.44 / + 2. B 1.44 / + . C . D 1.44
141 O
A 1.34 . B 1.1 . C . D 1.7 .
142
A
B
C D
143 A
A B
C
D
144 E
A B
C
D
145 C
A B
C D
146I ,
A CB B CE
C CC D
147 A CB
A B
C D
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148 C
A B
C D
149 N
A ,
B ,
C , D ,
150
A B
C D
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1 R
A B
C D
2 A
A B
C D
3
A B
C D
4 A
A
B
C D
5 A
A B
C D
6 F
A K' B
C M D N
7 D.C.
A
B D.C.
C
D N
8 A
A D.C.
B
D.C.
C
D.C.
D
9 B
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A B
C D
10 I A ,
A
B
C D
11 F ,
A B M D '
C D A
12 F
A A B M'
C H D A
13 I 80,
A 10 B 80
C 120 D 170
14 I
A B 1
C 5 D 10
15
I
A
B
C
D A
16
A B
C D
17
A B
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C D
18 C
A B
C D
19 F ,
A M' B M
C H' D A
20
A B
C D
21
A B
C D
22 Q :
A
R
.
BR
.
CR
.D .
23
A B O
C /O D O/
24 PMMC DA
A DC B AC
C B DC & AC D N
25
A P B
C R D A
26
A E B O
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C E D I
27
A A B
C D A
28
A D B C
C D D A
29 A
.
A B
C D
30 A
A B
C D
31 A
A
B
C
D
32
A B M
C C D A
33 I
A B
C D
34 A
A B
C D
35 .
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A A B P
C D I
36 , LD
A A B P
C A D P
37 A
AM
B
Pressure into a change of resistance
C F DForce into a displacement
38 P .
A M BVibrations
C I D H
39 I LD,
AA
B
Vary unequally depending on the core
position
CVary equally depending onthe core position
D Are always in phase quadrature
40 LD
A J B F
C L D H
41 LDR .
A R B I
C R D D
42
A B E
C D LD
43 LD
ASelf inductance
B M
C R D P
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44 1: .
2: .
A 1 & 2 B 2 & 1
C B 1 & 2 D B 1 & 2
45
AD
B
D
C
C
DMovement of magnetic field producesvariation in resistance of material
46
A LDR B P
C P D P
47 BH C :
A H B I
C E D B () (
48 I CRO
A B
C E D B
49
AA C
B DC
C 50 H 60 H D
50 H B :
A I Q>10 B I Q
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C 0.92 D 0.25
52
I ?
A M B
C L D H
53
?
A F B
C D P
54
?
A B E
C D LD
55
A B
C D
56
A Electrometer B Galvanometer
C Voltmeter D Coulometer
57
A 10 ,
.F
A 20/3 B 10/3
C 203 D 103
58
A
A Low internal resistance B High internal resistance
C Electrostatic plates D A sensitive amplifier
59
A Highly inductive B Highly resistive
C Purely resistive D Purely inductive
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60
CRO . I ,
. .
A The signals are not sinusoidal BThe amplitudes of the signals are very
close but not equal
C
The signals are sinusoidal with
their frequencies very close but
not equalD
There is a constant but small phase
difference between the signals
61
I ,
,
A P B P
C P 0.5 D P 0.5
62
A
AG
B
I , ,
CG
DG
63
A
B
CF
DB
64
A B
C N D
65
?
A A B Aperture droop
C F D Acquisition jitter
66 ,
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A Drawing graph B Indicating direction
C Calculating length D Measuring at a distance
67
C
A Frequency modulation B Pulse amplitude modulation system
C Impulse counting system D Impulse frequency system
68
AMechanical displacement in to a
change in resistanceB
Resistance in to a change in
mechanical displacement
CCurrent in to a change in
resistanceD None of this
69
I CR , ,
A The spot screw B Holding switch
C The control grid D First anode
70
I
A Quadrupole lens B Increasing current
C Control grid D Deflection plates
71
A Voltage and curent B Current and inductance
C Voltage and frequency D All of above
72
A 1 A 100
0 100 A .
A 9.10 B 1.01
C 0 D 10
73 R
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A Power factor B Form factor
C Phase value D N
74
D ()
A Low B High
C Value does not affect sensitivity D None of this
75
CR
A Meter/Volt B Volts
C Volts/Meter D Volts/Time
76
A Ratio of rms value to peak value B Ratio of value of current to rms value
CRatio of value of current to value
of peak valueD Ratio of peak value to rms value
77
A Less than 100 mV B Greater than 1 V
CThermocouples vary resistance,
not voltageD None of this
78
?
AFor extremely low-voltage
applicationsB
To provide power to a circuit when
power is lost
C To control low-voltage circuits D
To reduce radiation of high
frequencies during turn-on of a high
current to a load
79
A Thermocouples B RTDs
C thermistors D All of the above
80
Ato decrease temperature
sensitivityB to increase voltage output
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Cto cancel unwanted voltage
output of a thermocoupleD used for high-temperature circuits
81 .
A A B
C P D I
82
A PMMC B M
C I D N
83E :
A H B L
C L D H
84M :
A H B L
C H D L
85
A LDR B P
C P D P
86 :
A M B H
C PMMC D E
87LD
A B F
C A D C
88
?
A F B
C D P
89 :
A B L
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C D N
90
, LD A A B A
C P D P
91
C
.
A P B
C P D P
92
LD
A B R
C M D P
93A
A A B D
C A D P
94A
A A
B
E
CE
D
E
95 :
AH
B M
CH
DM
96 P :
A I B C
C C D R
97P
A
B
C
D
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98 :
A
B
A C M D
99I ,
A
BC
CC
DC
100 :
A
I
BI
C I D I
101
LDR .
A R B R
C I D D
102D
:
A
H
B
C)
D
A
103
A H B H
C B D F
104 LD
A J B L
C F D H
105A O :
A B A
A D N
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106P
A B R
C
D
F
107
A ) I B )
C ) R D ) P
108 A :
A) H
B) L
C ) E D ) L
109A :
A) D
B) B
C ) A D ) /
110 C
A ) B )
C ) D D ) B
111 ?
A ) B )
C ) E D ) LD
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1
A a
A Daaec aea B Feaec aea
C Paaaec aea D Deecc aea
2
Reae eeab f A
A 1.00000065 B 1.00000079
C 1.00004 D 1.0001
3 Ba ca
A 1.381 X 1023 J/K B 1.381 X 1023 J/K
C 1.381 X 1023 V/K D 1.381 X 1023 V/K
4 Cdc f Se ed ae de ____/ee
A 3.82 X 107 B 4.10 X 107
C 5.80 X 107 D 6.17 X 107
5
Cdc f Gd ed ae de ____/ee
A 3.82 X 107 B 4.10 X 107
C 5.80 X 107 D 6.17 X 107
6
IEEE cae feec bad K ______GH ae
A 8.000 12.000 B 12.000 18.000
C 18.000 27.000 D 27.000 40.000
7 IEEE cae feec bad X ______GH ae
A 8.000 12.000 B 12.000 18.000
C 18.000 27.000 D 27.000 40.000
8 A cdc f _____ cdc ad ____ eeab a c
edace.
A L, L B L, H
C H, L D H, H
9 Pce adaae f cae e feec
A Iceaed badd B Iceaed ac
C Ab e a,
dec aea
D A f e abe
10 Mcae ae efeed f TV a becae
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A Of a S/N a B Te dce e ae
d
C Te ae eae
ceae
D Te ae fee f e
e
11 Ra d aea cae caed de
A Scae f cae
b ae d f ecfc
e
B. Scae f cae b a
cec f de ac f
a e bd
C Ab f cae
b ae cee
ea f e d
D Ab f cae b
ae a e
aee
12 Sadad ac cae cc ae SWR f
A 0.5 : 1 2 : 1 B 1 : 0 2 : 1
C 1.2 : 1 2 : 1 D 1.33 : 1 2 : 1
13 I cae e ae e eee a
A Led cc eee B Dbed cc eee
C B a ad b D Ne f e abe
14 Mcae eeae ae ca 50 aa
A Becae f ea
cae
B Becae f aec
aea
C Becae f bee a
D T ee a e aed dcae ecee
15 We e feeace aee f a a ea e c ff
aee f de
A Te ec f e
a bece e.
B Te ae