Digital Techniques (DTE) 22320 MCQ I-scheme pdf with answers
4.Sequential Logic circuit
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
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