Digital Principles and System Design MCQs with answers Page - 10

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Q. In which of the following gates the output is 1 if and only if at least one input is 1?

  • (A) and
  • (B) nor
  • (C) nand
  • (D) or

A

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Q. The time required for a gate or inverter to change its state is called

  • (A) rise time
  • (B) decay time
  • (C) propagation time
  • (D) charging time

A

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Q. What is the minimum number of two input NAND gates used to perform the function of two input OR gates?

  • (A) one
  • (B) two
  • (C) three
  • (D) four

A

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Q. Odd parity of word can be conveniently tested by

  • (A) or gate
  • (B) and gate
  • (C) nand gate
  • (D) xor gate

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Q. The number of full and half adders are required to add 16-bit number is

  • (A) 8 half adders, 8 full adders
  • (B) 1 half adders, 15 full adders
  • (C) 16 half adders, 0 full adders
  • (D) 4 half adders, 12 full adders

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Q. Which of the following will give the sum of full adders as output?

  • (A) three point major circuit
  • (B) three bit parity checker
  • (C) three bit comparator
  • (D) three bit counter

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Q. An OR gate can be imagined as

  • (A) switches connected in series
  • (B) switches connected in parallel
  • (C) mos transistor connected in series
  • (D) bjt transistor connected in series

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Q. How many full adders are required to construct an m-bit parallel adder?

  • (A) m/2
  • (B) m
  • (C) m-1
  • (D) m+1

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Q. Boolean Function is of the form of

  • (A) truth values
  • (B) k=f(x,y,x)
  • (C) algebraic expression
  • (D) truth table

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Q. The result of X+X.Y is X.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

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