Digital Logic Circuits (DLC) MCQs with answers Page - 26

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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

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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

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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

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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

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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

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Q. Half subtractor is used to perform subtraction of

  • (A) 2 bits
  • (B) 3 bits
  • (C) 4 bits
  • (D) 5 bits

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Q. For subtracting 1 from 0, we use to take a from neighbouring bits.

  • (A) carry
  • (B) borrow
  • (C) input
  • (D) output

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Q. How many outputs are required for the implementation of a subtractor?

  • (A) 1
  • (B) 2
  • (C) 3
  • (D) 4

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Q. Let the input of a subtractor is A and B then what the output will be if A = B?

  • (A) 0
  • (B) 1
  • (C) a
  • (D) b

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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

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