Digital Principles and System Design MCQs with answers Page - 12

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Q. What is the indication of a short to ground in the output of a driving gate?

  • (A) only the output of the defective gate is affected
  • (B) there is a signal loss to all load gates
  • (C) the node may be stuck in either the high or the low state
  • (D) the affected node will be stuck in the high state

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Q. For the device shown here, assume the D input is LOW, both S inputs are LOW and the input is LOW. What is the status of the Y’ outputs?

  • (A) d
  • (B) a
  • (C) c
  • (D) b

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Q. Which of the following combinations of logic gates can decode binary 1101?

  • (A) one 4-input and gate
  • (B) one 4-input and gate, one inverter
  • (C) one 4-input and gate, one or gate
  • (D) one 4-input nand gate, one inverter

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Q. The carry propagation can be expressed as

  • (A) cp = ab
  • (B) cp = a + b
  • (C) all but y0 are low
  • (D) all but y0 are high

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Q. The basic building blocks of the arithmetic unit in a digital computers are

  • (A) subtractors
  • (B) adders
  • (C) multiplexer
  • (D) comparator

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Q. A digital system consists of types of circuits.

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

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Q. In a sequential circuit, the output at any time depends only on the input values at that time.

  • (A) past output values
  • (B) intermediate values
  • (C) both past output and present input
  • (D) present input values

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Q. The design of an ALU is based on

  • (A) sequential logic
  • (B) combinational logic
  • (C) multiplexing
  • (D) de-multiplexing

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Q. If the two numbers are unsigned, the bit conditions of interest are the carry and a possible result.

  • (A) input, zero
  • (B) output, one
  • (C) input, one
  • (D) output, zero

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Q. If the two numbers include a sign bit in the highest order position, the bit conditions of interest are the sign of the result, a zero indication and

  • (A) an underflow condition
  • (B) a neutral condition
  • (C) an overflow condition
  • (D) one indication

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