Digital Electronics and Logic Design MCQs with answers Page - 53

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Q. A multiplexer with a register circuit converts

  • (A) serial data to parallel
  • (B) parallel data to serial
  • (C) serial data to serial
  • (D) parallel data to parallel

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Q. in , all the columns in the same row are either read or written.

  • (A) sequential access
  • (B) mos access
  • (C) fast mode page access
  • (D) none of given options

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Q. How many flip-flops are required to produce a divide-by-32 device?

  • (A) 2
  • (B) 5
  • (C) 6
  • (D) 4

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Q. A reduced state table has 18 rows. The minimum number of flip flops needed to implement the sequential machine is

  • (A) 18
  • (B) 9
  • (C) 5
  • (D) 4

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Q. Advantage of synchronous sequential circuits over asynchronous ones is

  • (A) faster operation
  • (B) ease of avoiding problems due to hazard
  • (C) lower hardware requirement
  • (D) better noise immunity

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Q. The characteristic equation of a JK flip flop is

  • (A) qn+1=j.qn+k.q n
  • (B) qn+1=j.q’n+ k’.qn
  • (C) qn+1=qnj.k
  • (D) qn+1=(j+k )qn

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Q. WHEN BOTH THE INPUTS OF EDGE-TRIGGERED J-K FLOP-FLOP ARE SET TO LOGIC ZERO -------

  • (A) the flop- flop is triggered
  • (B) q=0 and q‟=1
  • (C) q=1 and q‟=0
  • (D) the output of flip- flop remains unchang ed

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Q. In Q output of the last flip-flop of the shift register is connected to the data input of the first
flip-flop of the shift register.

  • (A) moore machine
  • (B) meally machine
  • (C) johnson counter
  • (D) ring counter

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Q. 5-BIT JOHNSON COUNTER SEQUENCES THROUGH STATES

  • (A) 7
  • (B) 10
  • (C) 32
  • (D) 25

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Q. AT T0 THE VALUE STORED IN A 4-BIT LEFT SHIFT WAS “1”. WHAT WILL BE THE VALUE OF REGISTER AFTER THREE CLOCK PULSES?

  • (A) 2
  • (B) 4
  • (C) 6
  • (D) 8

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