Top 550+ Solved Digital Principles and System Design MCQ Questions Answer
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. 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. How many AND, OR and EXOR gates are required for the configuration of full adder?
a. 1, 2, 2
b. 2, 1, 2
c. 3, 1, 2
d. 4, 0, 1
Q. Let A and B is the input of a subtractor then the output will be
a. a xor b
b. a and b
c. a or b
d. a exnor b
Q. Let A and B is the input of a subtractor then the borrow will be
a. a and b’
b. a’ and b
c. a or b
d. a and b
Q. The full subtractor can be implemented using
a. two xor and an or gates
b. two half subtractors and an or gate
c. two multiplexers and an and gate
d. two comparators and an and gate
Q. The output of a subtractor is given by (if A, B and X are the inputs).
a. a and b xor x
b. a xor b xor x
c. a or b nor x
d. a nor b xor x
Q. The decimal number system represents the decimal number in the form of
a. hexadecimal
b. binary coded
c. octal
d. decimal
Q. The output sum of two decimal digits can be represented in
a. gray code
b. excess-3
c. bcd
d. hexadecimal
Q. The addition of two decimal digits in BCD can be done through
a. bcd adder
b. full adder
c. ripple carry adder
d. carry look ahead