Digital Electronics MCQs of Engineering Questions. This mcqs are useful in your university SPPU exams 2020, placements exams, GATE and others all exams.
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1. Which of the following circuits come under the class of combinational logic circuits? 1. Full adder 2. Full subtractor 3. Half adder 4. J-K flip-flop 5. Counter
Select the correct answer from the codes given below:
a. 1 only
b. 3 and 4
c. 4 and 5
d. 1, 2 and 3
Ans: d
2. Which of the following circuits come under the class of sequential logic
circuits? 1. Full adder 2. Full subtractor 3. Half adder 4. J-K flip-flop 5. Counter
Select the correct answer from the codes given below:
a. 1 and 2
b. 2 and 3
c. 3 and 4
d. 4 and 5
Ans: d
3. Clock is a---- signal.
a. rectangular
b. triangular
c. pulse
d. Any other
Ans: a
4. A flip flop is a
a. combinational circuit
b. memory element
c. arithmetic element
d. memory or arithmetic
Ans: b
5. The basic storage element in a digital system is
a. flip flop
b. counter
c. multiplexer
d. encoder
Ans: a
6. ____FF is used to provide delay in ciruit.
a. SR
b. D
c. JK
d. any other
Ans: b
7. In a D latch
a. a high D sets the latch and low D resets it
b. a low D sets the latch and high D resets it
c. race can occur
d. none of above
Ans: a
8. ____ is basically group of FFs
a. counter
b. register
c. latch
d. Any other
Ans: b
9. The simplest register is
a. buffer register
b. shift register
c. controlled buffer register
d. bidirectional register
Ans: a
10. The basic shift register operations are
a. serial in serial out
b. serial in parallel out
c. parallel in serial out
d. all of above
Ans: d
11. SIPO stands for-----
a. serial in parallal out
b. serial in serial out
c. serial
d. Any other
Ans: a
12. A universal shift register can shift
a. from right to left
b. from left to right
c. both from right to left and left to right
d. none of above
Ans: c
13. An 8 bit binary number is to be entered into an 8 bit serial shift register. The
number of clock pulses required is
a. 1
b. 2
c. 4
d. 8
Ans: d
14. An 8 bit binary number is to be entered into an 8 bit parallel-in shift register.
The number of clock pulses required is
a. 1
b. 2
c. 4
d. 8
Ans: a
15. The digital circuit used for counting pulse is known as_____.
a. counter
b. FF
c. register
d. any other
Ans: a
16. A counter is a
a. Sequential ckt
b. Combinational ckt
c. both combinational and sequential ckt
d. none of above
Ans: a
17. IC counters are
a. synchronous only
b. asynchronous only
c. both synchronous and asynchronous
d. none of above
Ans: c
18. A counter has 4 flip flops. The total number of states are
a. 8
b. 10
c. 16
d. 15
Ans: c
19. A counter has N flip flops. The total number of states is
a. N
b. 2N
c. N2
d. 4N
Ans: b
20. A 3 bit up-down counter can count from
a. 000 to 111
b. 111 to 000
c. 000 to 111 and also from 111 to 000
d. none of above
Ans: c
21. A 4 bit down counter can count from
a. 0000 to 1111
b. 1111 to 0000
c. 000 to 111
d. 111 to 000
Ans: b
22. A mod 4 counter will count
a. from 0 to 4
b. from 0 to 3
c. from any number n to n+4
d. none of above
Ans: b
23. A counter has modulus of 10. The number of flip flops is
a. 10
b. 5
c. 4
d. 3
Ans: c
24. The number of flip flops needed for Mod 7 counter are
a. 7
b. 5
c. 3
d. 1
Ans: c
25. A three-bit up-down binary counter is in the down mode and in the 000 state.
After 3 clock pulses, to what state does the counter go?
a. 101
b. 011
c. 111
d. 110
Ans: a
26. A three-bit up-down binary counter is in the up mode and in the 110 state.
After 3 clock pulses, to what state does the counter go?
a. 010
b. 011
c. 001
d. 110
Ans: c
27. A decade counter skips
a. binary states 1000 to 1111
b. binary states 0000 to 0011
c. binary states 1010 to 1111
d. binary states 1111 and higher
Ans: c
28. Which parts of the computer perform arithmetic calculations?
a. ALU
b. Registers
c. Logic bus
d. none of above
Ans: a
29. _________ is used to identify particular location in main memory where
data is store.
a. Data Bus
b. Control Bus
c. Address Bus
d. Any other
Ans: c
30. Each box in memory has __________ address.
a. unique
b. alterable
c. two
d. double
Ans: a
31. Accumulator's main purpose is _________.
a. temporary data storage
b. keeping track of the next instruction to be executed
c. selecting which peripheral should be addressed
d. storing instructions
Ans: a
32. Microprocessor communicates with the outside world through the ______.
a. memory
b. I/O devices
c. ALU
d. NONE OF THE ABOVE
Ans: b
33. ______ register gives the address of the memory location from where the next instruction is to be fetched.
a. Accumulator
b. SP
c. PC
d. any of the above
Ans: c
This is the end of Digital Elctronics MCQs set.
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