Digital Logic Circuits (DLC) MCQs with answers Page - 25

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Q. The S-R, J-K and D inputs are called

  • (A) asynchronous inputs
  • (B) synchronous inputs
  • (C) bidirectional inputs
  • (D) unidirectional inputs

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Q. The characteristic of J-K flip-flop is similar to

  • (A) s-r flip-flop
  • (B) d flip-flop
  • (C) t flip-flop
  • (D) gated t flip-flop

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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

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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

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Q. 48 MHz.

  • (A) 10.24 khz
  • (B) 5 khz
  • (C) 30.24 khz
  • (D) 15 khz

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Q. How many flip-flops are in the 7475 IC?

  • (A) 2
  • (B) 1
  • (C) 4
  • (D) 8

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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

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Q. Total number of inputs in a half adder is

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

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Q. In which operation carry is obtained?

  • (A) subtraction
  • (B) addition
  • (C) multiplication
  • (D) both addition and subtraction

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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

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