Top 350+ Solved Digital Logic Circuits (DLC) MCQ Questions Answer
Q. A J-K flip-flop can be obtained from the clocked S-R flip-flop by augmenting
a. two and gates
b. two nand gates
c. two not gates
d. two or gates
Q. What is the significance of the J and K terminals on the J-K flip-flop?
a. there is no known significance in their designations
b. the j represents “jump,” which is how the q output reacts whenever the clock goes high and the j input is also high
c. the letters were chosen in honour of jack kilby, the inventory of the integrated circuit
d. all of the other letters of the alphabet are already in use
Q. In parts of the processor, adders are used to calculate
a. addresses
b. table indices
c. increment and decrement operators
d. all of the mentioned
Q. In which operation carry is obtained?
a. subtraction
b. addition
c. multiplication
d. both addition and subtraction
Q. If A and B are the inputs of a half adder, the sum is given by
a. a and b
b. a or b
c. a xor b
d. a ex-nor b
Q. If A and B are the inputs of a half adder, the carry is given by
a. a and b
b. a or b
c. a xor b
d. a ex-nor b
Q. Half-adders have a major limitation in that they cannot
a. accept a carry bit from a present stage
b. accept a carry bit from a next stage
c. accept a carry bit from a previous stage
d. accept a carry bit from the following stages
Q. The difference between half adder and full adder is
a. half adder has two inputs while full adder has four inputs
b. half adder has one output while full adder has two outputs
c. half adder has two inputs while full adder has three inputs
d. all of the mentioned
Q. If A, B and C are the inputs of a full adder then the sum is given by
a. a and b and c
b. a or b and c
c. a xor b xor c
d. a or b or c
Q. If A, B and C are the inputs of a full adder then the carry is given by
a. a and b or (a or b) and c
b. a or b or (a and b) c
c. (a and b) or (a and b)c
d. a xor b xor (a xor b) and c
Q. For subtracting 1 from 0, we use to take a from neighbouring bits.
a. carry
b. borrow
c. input
d. output