PAPER-2(ECE) ESE-2017 Solution SET-D
1. (A) Refer Page-18 of Advance Electronics book and it was discussed in class also
It describes the areas where thin oxides are needed to implement the transistor gates and allow implantations
to form p/n type diffusions. A thin layer of SiO2i s grown and covered with SiN and this is used as mask.
The bird's bead must be taken into account while designing thin-ox
2. (D) Direct Question from Class Notes
Same concept was discussed in class notes as shown below:
3. (A) Refer Page-80 of Advance Electronics Book and discussed in class also
4. (B) Refer Page-154 of Advance Electronics Book and discussed in class also
5.(C)
6.(B)
7.(D)
8.(A)
Same concept was discussed in class notes as shown below:
9.(D) Refer Page-53 of Advance Electronics book and discussed in class also
10.(D) Same question was discussed in class notes as follows
11.(A) Same concept was discussed in class notes as follows:
12.(B) Same concept was discussed in class notes as follows:
13.(A) Same concept was discussed in class notes as follows:
14.(B)
15.(C)
16.(D) Refer Page-75 Advance Electronics Class notes
17(B) Same concept was discussed in class notes as follows:
18.(C) Induced EMF is proportional to Inductance so statement -2 is wrong .
Same concept was discussed in class given below.
19(D)
There exists a definite relation between the direction of the induced current, the direction of the flux and the
direction of motion of the conductor. The direction of the induced current may be found easily by applying
either Fleming's Right-hand Rule or Lenz's Law. Fleming's rule is used where induced EMF is due to,
flux cutting (i.e. dynamically induced. EMF) and Lenz's when it is due to change by flux linkages (i.e.
statically induced Emf).
Fleming's Right-Hand Rule: “Hold out your right hand with forefinger, second fingure, and thumb at right
angles to one another. If the forefinger represents the direction of the field, and the thumb represents the
direction of the motion then, the second finger represents the direction of the induced emf in the coil”.
20(D)
A photo relay or light activated relay is a circuit which opens and closes the relay contacts according to the
light. Here a photo diode is used to sense the light. The photo diode offers a high resistance when there is no
light falling on it. Here the photo diode is connected in reverse biased condition. The only current flowing
through it will be due to the minority carriers. When light falls on it, the current due to the minority carriers
increase and the diode offers a low resistance. As a result the voltage across the diode will not be sufficient
to make the transistor Q1 forward biased and the relay will OFF.When there is darkness the photo diode
resistance increases and the voltage across it will become enough to forward bias the transistor Q1 making
the relay ON. The diode D2 is used as a freewheeling diode to protect the transistor from transients
produced to the switching of relay. By this way the load connected through the relay contacts can be
switched ON and OFF according to the light falling on the photo diode.
21.(B)
Refer Basic Electrical Book topic “Auto Transformer”
22.(B) Refer Page-80 of Advance Electronics Book and discussed in class also
23(A) Refer Page-212 Basic Electrical Book
Base Load Power Plants: Plants that are running continuously over extended periods of time are said to be
base load power plant. The power from these plants is used to cater the base demand of the grid. A power
plant may run as a base load power plant due to various factors (long starting time requirement, fuel
requirements, etc.). Examples of base load power plants are:
1. Nuclear power plant
2. Coal power plant
3. Hydroelectric plant
4. Geothermal plant
5. Biogas plant
6. Biomass plant
7. Solar thermal with storage
8. Ocean thermal energy conversion
24(B) Solar insolation is a measure of solar radiation energy received on a given surface area in a given time. It is
commonly expressed as average irradiance in watts per square meter (W/m2) or kilowatt-hours per square
meter per day (kW•h/(m2•day)) (or hours/day). In the case of photovoltaic it is commonly measured as
kWh/(kWp•y) (kilowatt hours per year per kilowatt peak rating).The object or surface that solar radiation
strikes may be a planet, a terrestrial object inside the atmosphere of a planet, or any object exposed to solar
rays outside of an atmosphere, including spacecraft. Some of the solar radiation will be absorbed, while the
remainder will be reflected. Usually the absorbed solar radiation is converted to thermal energy, causing an
increasing in the object’s temperature. Some systems, however, may store or convert a portion of the solar
energy into another form of energy, as in the case of photovoltaic or plants. The amount of insolation
received at the surface of the Earth is controlled by the angle of the sun, the state of the atmosphere, altitude,
and geographic location.
25.(C) Resolution is not related with accuracy.
26.(C) Discussed in control system classes
27.(A) Discussed in control system classes
28.(B) RAM&ROM was discussed in class in digital electronics
29.(B)
30.(C) Discussed in class in advance electronics speech processing
31.(C) It is based upon basic super position theorem.
32.(A) When light falls then new EHPs are created.
Same concept was discussed in class notes as shown below
33.(A) Same question was done in class notes as shown below.
34(D) Same formula was discussed in class.
35 (A) Discussed in class notes as given above.
36(C) Direct question from class notes
37(B) Since frequencies are very low so DC amplifier will be preferred.
38.(B) Virtual ground concept is due to high value of open loop gain and high value of input
impedance. Same concept was discussed in class notes as shown below.
39 (D) Same concept was discussed in class notes:
40(D) Same concept was discussed in class notes.
The illumination characteristics of a typical photoconductive cell are shown from which it is obvious that
when the cell is not illuminated its resistance may be more than 1 00 kilo ohms. This resistance is called
the dark resistance. When the cell is illuminated, the resistance may fall to a few hundred ohms. Note that
the scales on the illumination characteristic are logarithmic to cover wide ranges of resistance and illu-
mination that are possible. Cell sensitivity may be expressed in terms of the cell current for a given voltage
and given level of illumination.
The illumination characteristics of a typical photoconductive cell are shown from which it is obvious that
when the cell is not illuminated its resistance may be more than 1 00 kilo ohms. This resistance is called
the dark resistance. When the cell is illuminated, the resistance may fall to a few hundred ohms. Note that
the scales on the illumination characteristic are logarithmic to cover wide ranges of resistance and illu-
mination that are possible. Cell sensitivity may be expressed in terms of the cell current for a given voltage
and given level of illumination.
41(C) Same concept was discussed in class notes.
42(C) Same concept was discussed in class.
43(C) Direct question
44(D) Same concept has discussed in Q.19
45(B) In case of motional EMF it is vbl sinα
Discussed in class notes.
46(A) discussed in class notes as shown below
47.(C) Similar type of questions discussed in Machine subject
48.(C) Similar type of questions discussed in Machine subject
49.(C) Similar type of questions discussed in Machine subject
50.(D) Similar type of questions discussed in Machine subject
51.(B) Similar type of questions discussed in Machine subject
52.(D) Just solve by dimension only and has done these type of questions in class
53.(D) Same question was done in class notes
54(B) Ceramic material discussed in class notes in detail.
55.(B) Same question was done in class
56.(B) Same type of question done in class
57.(B) Same question was done in class.
58.(A) Same concept was done in class.
59.(B) For LED material should be direct band gap type material
60.(C) These methods were discussed in Nano Material class notes
61.(C) Repeated question and was discussed in class
62.(C) Repeated question and was discussed in class
63.(D) Repeated question and was discussed in class
64.(D) Repeated question and was discussed in class
65.(B) Repeated question and was discussed in class
66.(C) Repeated question and was discussed in class
67.(A) Repeated question and was discussed in class
68.(A) Repeated question and was discussed in class
69.(B)
70.(B) Same type of question discussed in cache memory
71.(D)
72.(D) direct question Loss=10log(NF) has done in class notes
73.(C)
74.(D) By definition of operating system has discussed in class
75.(D) Discuss same type of question in class notes.
76.(A) Discussed same concept in class notes
77.(B) Same type of question was discussed in class notes.
78.(A) Concept was discussed in class notes
79.(C)
80.(D) Same type of question was discussed in class
81(B)
82(C) Same Formula was discussed in class notes
83.(C) Same type of question discussed in class notes.
84.(D)
85.(C) Similar type of question was discussed
86. It should be N0/2
87.(C) such type of Qs were discussed in class
88.(D) Repeated question of assignment and was done in class
89.(B) Repeated question of assignment and was done in class
90.(D) Repeated question of assignment and was done in class
91.(C)
92.(B) Refer Measurement Notes
93(A) Refer Measurement Notes
94(A) Refer Measurement Notes
95(A) Refer Measurement Notes
96(D) Refer Measurement Notes
97(B) Refer Measurement Notes
98(B) Refer Measurement Notes
99(B) Refer Measurement Notes
100(C) Refer Measurement Notes
101.(B) Direct Question based upon formula
102.(D) Refer Measurement Notes
103(D) Refer Measurement Notes
104(D) Refer Measurement Notes
105(B) Refer Measurement Notes
106(A) Discuss in detail in TDM
107(A) Refer Measurement Notes
108(B) Refer Measurement Notes
109(D)
110(B) There are two types of Networks distributed and lumped networks.
111(C)
112(B)
113(D) Similar type Of Qs were discussed
114(D)
115(B) Not exact answer but matching with this.
116(B) Repeated Question From Class Notes
117(B) Inductor behaves like an open circuit at t=0
118(A) Refer Series RLC in Network class Notes
119(D) discussed in class notes
120(C)
121(A)
122(A)
123(D) Similar type of Qs was discussed in class notes
124(B) Similar type of Qs was discussed in class
125(C) Similar type of Qs was discussed in class.
126(C) Direct question on K-Map from Class notes
127(C) Direct Question from Class notes
128(D)
It is Mod-8 Counter so output will be f/8 .Many similar type of Qs discussed in class.
129(C) Many such type of questions were discussed in class notes.
130(B)
131(B) Same Question was discussed in class notes.
132(B) Ceramic Properties were discussed in class
133(B) Discussed in Machine class
134(D) Discussed in class notes
135(C) discussed in class notes
136(D) discussed in class notes
137(A) Same concept was discussed in class.
138(C) This concept was discussed in detail in class
139(B)
140(C)
141(D) It is direct formula discussed in class
142(C) Same Q was discussed in class
143(B) PCM is used for conversion from Analog to Digital at base band and pass band level only.
144(D)
145(C) Refer control system class notes
146(C) Refer control system class notes
147(A) Refer control system class notes
148(C) Direct formula for Entropy discussed in class notes
149(A) Refer control system class notes
150(B) Refer control system class notes