STLD
1.
Any number with an exponent of zero is equal to: A. B. C. D.
zero one that number ten
Answer: Option B 2. In the decimal numbering system, what is the
MSD? A. B. C. D. The middle digit of a stream of numbers The digit
to the right of the decimal point The last digit on the right The
digit with the most weight
Answer: Option D 3. Which of the following statements does NOT
describe an advantage of digital technology? A. B. C. D. The values
may vary over a continuous range. The circuits are less affected by
noise. The operation can be programmed. Information storage is
easy.
Answer: Option A 4. The generic array logic (GAL) device is
________. A. B. one-time programmable reprogrammable
C. D.
a CMOS device reprogrammable and a CMOS device
Answer: Option B 5. The range of voltages between VL(max) and
VH(min) are ________. A. B. C. D. unknown unnecessary unacceptable
between 2 V and 5 V
Answer: Option C 6. What is a digital-to-analog converter? A. B.
C. D. It takes the digital information from an audio CD and
converts it to a usable form. It allows the use of cheaper analog
techniques, which are always simpler. It stores digital data on a
hard drive. It converts direct current to alternating current.
Answer: Option A 7. What are the symbols used to represent
digits in the binary number system? A. B. C. D. 0,1 0,1,2 0 through
8 1,2
Answer: Option A 8. A full subtracter circuit requires ________.
A. B. two inputs and two outputs two inputs and three outputs
C. D.
three inputs and one output three inputs and two outputs
Answer: Option D 9. The output of an AND gate is LOW ________.
A. B. C. D. all the time when any input is LOW when any input is
HIGH when all inputs are HIGH
Answer: Option B 10. Give the decimal value of binary 10010. A.
C. 610 1810 B. D. 910 2010
Answer: Option C 11. Parallel format means that: A. B. C. D.
each digital signal has its own conductor. several digital signals
are sent on each conductor. both binary and hexadecimal can be
used. no clock is needed.
Answer: Option A 12. A decoder converts ________. A. B. C. D.
Non coded information into coded form coded information into non
coded form HIGHs to LOWs LOWs to HIGHs
Answer: Option B
13. A DAC changes ________. A. B. C. D. an analog signal into
digital data digital data into an analog signal digital data into
an amplified signal none of the above
Answer: Option B 14. The output of a NOT gate is HIGH when
________. A. B. C. D. the input is LOW the input is HIGH the input
changes from LOW to HIGH voltage is removed from the gate
Answer: Option A 15. The output of an OR gate is LOW when
________. A. B. C. D. all inputs are LOW any input is LOW any input
is HIGH all inputs are HIGH
Answer: Option A 16. Which of the following is not an analog
device? A. B. C. D. Thermocouple Current flow in a circuit Light
switch Audio microphone
Answer: Option C 17. A de multiplexer has ________.
A. B. C. D.
one data input and a number of selection inputs, and they have
several outputs one input and one output several inputs and several
outputs several inputs and one output
Answer: Option A 18. A flip-flop has ________. A. B. C. D. one
stable state no stable states two stable states none of the
above
Answer: Option C 19. Digital signals transmitted on a single
conductor (and a ground) must be transmitted in: A. B. C. D. slow
speed. parallel. analog. serial.
Answer: Option D 20. In a certain digital waveform, the period
is four times the pulse width. The duty cycle is ________. A. C. 0%
50% B. D. 25% 100%
Answer: Option B
21. In positive logic, ________. A. B. C. D. a HIGH = 1, a LOW =
0 a LOW = 1, a HIGH = 0 only HIGHs are present only LOWs are
present
Answer: Option A 22. Convert the fractional binary number
0000.1010 to decimal. A. C. 0.625 0.55 B. D. 0.50 0.10
Answer: Option A 23. Digital representations of numerical values
of quantities may BEST be described as having characteristics: A.
B. C. D. that are difficult to interpret because they are
continuously changing. that vary constantly over a continuous range
of values. that vary in constant and direct proportion to the
values they represent. that vary in discrete steps in proportion to
the values they represent.
Answer: Option D 24. A common instrument used in troubleshooting
a digital circuit is a(n) ________. A. B. C. D. logic probe
oscilloscope pulser all of the above
Answer: Option D 25. The parallel transmission of digital data:
A. is much slower than the serial transmission of data.
B. C. D.
requires only one signal line between sender and receiver.
requires as many signal lines between sender and receiver as there
are data bits. is less expensive than the serial method of data
transmission.
Answer: Option C
26.
Convert the fractional decimal number 6.75 to binary. A. C.
0111.1100 0110.1100 B. D. 0110.1010 0110.0110
Answer: Option C 27. What is one relative disadvantage of serial
transfer? A. B. C. D. It requires too many conductors. Its
interconnect system is complex. It is slow. It can only be used
over very short distances.
Answer: Option C 28. Which format requires fewer conductors? A.
B. C. D. Parallel Serial Both are the same Cannot tell
Answer: Option B 29. A pulse has a period of 15 ms. Its
frequency is ________. A. B. 6.66 Hz 66.66 Hz
C. D.
666.66 Hz 15 Hz
Answer: Option B 31. The rise time is the time it takes a pulse
to go from ________. A. B. C. the base line to the maximum HIGH
voltage 10% of the pulse amplitude to the maximum HIGH voltage the
base line to 90% of the pulse amplitude 10% of the pulse amplitude
to 90% of the pulse amplitude D. Answer: Option D
32. What is an analog-to-digital converter? A. B. C. D. Answer:
Option B 33. A multiplexer has ________. A. B. C. D. one input and
several outputs one input and one output several inputs and several
outputs several inputs and one output It makes digital signals. It
takes analog signals and puts them in digital format. It allows the
use of digital signals in everyday life. It stores information on a
CD.
Answer: Option D 34. What is the decimal value of 23 ? A. 2 B.
4
C.
6
D.
8
Answer: Option D 35. An encoder converts ________. A. B. C. D.
noncoded information into coded form coded information into
noncoded form HIGHs to LOWs LOWs to HIGHs
Answer: Option A 36. What kind of logic device or circuit is
used to store information? A. C. Counter Inverter B. D. Register
Buffer
Answer: Option B 37. PLCC packages have leads on ________. A. B.
C. D. one side two sides three sides four sides
Answer: Option D 38. What is the typical invalid voltage for a
binary signal? A. B. C. D. 0.72.8 volts 0.83 volts 0.82 volts
0.72.5 volts
Answer: Option C 39. Convert the fractional binary number
0001.0010 to decimal.
A. C.
1.40 1.20
B. D.
1.125 1.80
Answer: Option B 40. Convert the fractional binary number
10010.0100 to decimal. A. C. 24.50 18.40 B. D. 18.25 16.25
Answer: Option B 41. How many binary bits are necessary to
represent 748 different numbers? A. C. 9 10 B. D. 7 8
Answer: Option C 42. A periodic digital waveform has a pulse
width (tw) of 6 ms and a period (T) of 18 ms. The duty cycle is
________. A. C. 3.3% 6% B. D. 33.3% 18%
Answer: Option B 43. Any number with an exponent of one is equal
to: A. B. C. D. zero. one. two. that number.
Answer: Option D 44. Serial format means digital signals are: A.
B. sent over many conductors simultaneously. sent over one
conductor sequentially.
C. D.
sent in groups of eight signals. sent in binary coded
decimal.
Answer: Option B 45. What is the decimal value of 21 ? A. C. 0.5
0.05 B. D. 0.25 0.1
Answer: Option A 46. Which format can send several bits of
information faster? A. B. C. D. Parallel Serial Both are the same
Cannot tell
Answer: Option A
47. The frequency of a pulse train is 2 kHz. The pulse period is
________. A. B. C. D. 5 ms 50 ms 500 2 s s
Answer: Option C
48. What has happened to the advances in digital technologies
over the past three decades? A. Slowed down considerably
B. C. D.
Continued to increase, but at a decreasing rate Made excellent
progress Nothing short of phenomenal
Answer: Option D A type of digital circuit technology that uses
bipolar junction transistors is ________. A. C. TTL LSI B. D. CMOS
NMOS
Answer: Option A
50. How many unique symbols are used in the decimal number
system? A. C. One Ten B. D. Nine Unlimited
Answer: Option C
51. The fraction (0.68)10 is equal to [ A. (0.010101)2 C.
(0.10101)2Answer: Option C
] B. (0.101)2 D. (0.10111)2
52. The Hexadecimal number A0 has the decimal value [ ] A. 80 B.
256 C. 100Answer: Option D
D. 160
53. Given two numbers A & B in sign magnitude representation
in an eight bit format A=00011110 & B=10011100, A XOR B gives [
] A. 10000010 B. 00011111 C. 10011101 D. 11100001Answer: Option
A
54. The value of binary 1111 is A. 23-1 C. 24Answer: Option
B
B. 24-1 D. none of these
55. The minimum number of bits required to represent negative
numbers in the range of -1 to -11 using 2s complement arithmetic is
A. 2 B. 3 C.4 D. 5Answer: Option D
56. The following code is not a BCD code. A. Gray code C. 8421
codeAnswer: Option A
B. Xs-3 code D. All of these
57. A 15-bit hamming code requires A. 4 parity bits C. 15 parity
bits
B. 5 parity bits D. 7 parity bits
Answer: Option A
58. If=5,the base(radix) of the number system is A. 5 C.
7Answer: Option A
B. 6 D. 8
59. Determine the value of base x if : (211)x = (152)8 A. 2 C.
8Answer: Option D
B. 10 D. 7
60. Determine the value of base x, if (193)x = (623)8 A. 16 C.
2
B. 4 D. 5
Answer: Option A
62. Which of the following are called Universal gates A.
NAND,NOR B. AND,OR C. XOR XNOR D. OR,XORAnswer: Option A
63. In bs complement method, the carry is ______ and in(b-1)s
complement method the carry is _______ A. discarded, added at the
end B. discarded, added at the end C. added, added D. discarded,
discardedAnswer: Option A
64. How many words does a 64 X 4 ROM consists of A. 4 C.
256Answer: Option D
B. 32 D. 64
65. Serial adder is an example of __________ circuit. A.
combinational C. both a and bAnswer: Option B
B. sequential D. flip flop
66. Which of the following is used for storage ? A. flip flop C.
OR gateAnswer: Option A
B. AND gate D. both b and c
67.
In a RS flip flop when the inputs are R=0 and S=1 then Q and
outputs are B. 0,0 D. invalid case
A. 0,1 C. 1 ,0Answer: Option C
68. In which circuit the output depends only on the present
state of the flip flops
A. mealy C. RS flipflopAnswer: Option D
B. JK flipflop D. moore
69. If all the transitions in a Mealy model to a particular
state are associated with only one type of output then in
corresponding Moore model that output becomes state output. This is
a rule in conversion of A. Mealy to Moore B. Moore to Mealy C. Rs
to JK flipflop D. both b and cAnswer: Option A
70. The SR flipflop can be converted to JK flipflop by using A.
two not gates C. OR+AND gatesAnswer: Option B
B. two AND gates D. cannot be converted
71. Which of the following is an application of flipflops? A.
can be used as memory element C. used in counters and
registersAnswer: Option D
B. used to eliminate debounce D. all the above
72. In a counter if the next state of some unused state is again
an unused state and if by chance the counter happens to find itself
in the unused states and never arrived at a used state then the
counter is said to be in A. unlock state B. damaged state C.
lockout state D. both a and bAnswer: Option C
73. When counter is clocked such that each flipflop in the
counter is triggered at the same time, the counter is A.
asynchronous C. activeAnswer: Option B
B. synchronous D. inactive
74. A PLA is a device with a programmable AND array and
programmable ______ array. A. AND B. OR C. NOT D. NOR
Answer: Option B
75. An n-stage ripple counter can count up ton n
A. C. n
2
B. 2 -1n-1
D. 2
Answer: Option B
76. A mod-13 counter must have A. 13 flip flops C. 4 flip
flopsAnswer: Option C
B. 3 flip flops D. synchronous clocking
77. Total no.of programmable fuses in n input m output PROM is
A. n C. 2nXmAnswer: Option C
B. nXmm
D. 2 Xn
78. The functional difference between an SR flip-flop and J-K
flip-flop is that A. J-K flip-flop is faster B. J-K flip-flop has
feedback C. J-K flip-flop accepts both inputs 1 D. J-K flip-flop
does not require clockAnswer: Option C
79. An Asynchronous counter differs from synchronous counter in]
A. Mod number B. Method of clocking C. the type of flip-flops used
D. the number of states in a sequenceAnswer: Option B
80. To serially shift a byte of data in to shift register there
must be A. 1 clock pulse B. one load pulse C. eight clock pulses D.
one clock pulse in each 1 in the dataAnswer: Option C
81. Programming a PLD device means A. writing software program
C. writing assembly language programAnswer: Option B
B. blowing electronic fuses D. writing C program
82. When power supply of ROM is switched off, its contents A.
becomes zero B. becomes all ones C. remains same D. are
unpredictableAnswer: Option C
83.
The characteristic equation of J-K flip flop is
______________
1
1
A.C.
JQ +K Q1
B. D.
J1Q+KQ1
JQ+K Q
JQ +KQ
Answer: Option A
84. A combinational PLD with programmable AND array and
programmable OR array is called A. PLA B. PROM C. PAL D. ROMAnswer:
Option A
85.
A counter that triggers all the flip-flops together is called
_______________ counter. A. ASYNCHRONOUS C.RIPPLE B. SYNCHRONOUS D.
MOD
Answer: Option B
86. A Jhonson counter uses __________ flip flops. A. T C.
DAnswer: Option C
B. JK D. SR
87. A. C.88.
A decision box in an ASM chart [ ] does not have exit paths has
two exit pathsA hamming code is a
B. have only one exit path D. has one entry and has one exit
path
Answer: Option C
A. Correcting code c. Both a and b Answer: Option C 89. What is
the even parity for 011000001111. A. 0 C. both Answer: Option B
B. detecting code D. none of these
B. 1 D. none
90. Base of hexadecimal number system is A. B.
16 10Answer: Option A 91. 9s complement of 99 is A. 0 C. 1
Answer: Option A B. 9 D. 10
B. 8 D. 15
92. What does MSB bit 1 signify in sign magnitude form? A.
positive B. same number
C. negativeAnswer: Option C
D.
none
93. Represent decimal 18 in hexadecimal form A. B B. 10 C. 12 D.
1F Answer: Option C 94. Output of XOR gate goes low when A. Both
inputs are same C. Both a and b Answer: Option A 95. Which gate is
also called as a Test Gate. A. AND B. NOT C. XOR D. EX-NOR Answer:
Option D 96. B. different D. does not exist
A. C.
A PLA is a device with a programmable AND array and programmable
______ array. AND B. OR NOT D. NOR
Answer: Option B 97. A. C. A PROM has AND array fixed Both a and
b B. OR array programmable D. And array programmable
Answer: Option C
98. Represent 54 in 3321 BCD code A. 1010 0101 C. 1011 1010
B. 0111 1010 D. 1000 0111
Answer: Option A 99. convert 110010 into its equivalent binary
A. 100010 B. 101011 C. 100011 D. 000011 Answer: Option C 100.
simplify BCD+ CD A. 0 C.c Answer: Option D B. 1 D. CD
