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MCQs

Total Questions : 133 | Page 2 of 14 pages
Question 11. . One example of the use of an S-R flip-flop is as a(n):
  1.    racer
  2.    astable oscillator
  3.    binary storage register
  4.    transition pulse generator
 Discuss Question
Answer: Option C. -> binary storage register
Question 12. . On a master-slave flip-flop, when is the master enabled?
  1.    when the gate is LOW
  2.    when the gate is HIGH
  3.    both of the above
  4.    neither of the above
 Discuss Question
Answer: Option B. -> when the gate is HIGH
Question 13. . What is the difference between the 7476 and the 74LS76?
  1.    the 7476 is master-slave, the 74LS76 is master-slave
  2.    the 7476 is edge-triggered, the 74LS76 is edge-triggered
  3.    the 7476 is edge-triggered, the 74LS76 is master-slave
  4.    the 7476 is master-slave, the 74LS76 is edge-triggered
 Discuss Question
Answer: Option D. -> the 7476 is master-slave, the 74LS76 is edge-triggered
Question 14. . What is another name for a one-shot?
  1.    Monostable
  2.    Multivibrator
  3.    Bistable
  4.    Astable
 Discuss Question
Answer: Option A. -> Monostable
Question 15. . With regard to a D latch, ________.
  1.    the Q output follows the D input when EN is LOW
  2.    the Q output is opposite the D input when EN is LOW
  3.    the Q output follows the D input when EN is HIGH
  4.    the Q output is HIGH regardless of EN's input state
 Discuss Question
Answer: Option C. -> the Q output follows the D input when EN is HIGH
Question 16. . A 555 operating as a monostable multivibrator has an R1 of 1 M. Determine C1 for a pulse width of 2 s.
  1.    1.8 F
  2.    18 F
  3.    18 pF
  4.    18 nF
 Discuss Question
Answer: Option A. -> 1.8 F
Question 17. . Which of the following is correct for a D latch?
  1.    The output toggles if one of the inputs is held HIGH.
  2.    Q output follows the input D when the enable is HIGH.
  3.    Only one of the inputs can be HIGH at a time.
  4.    The output complement follows the input when enabled.
 Discuss Question
Answer: Option B. -> Q output follows the input D when the enable is HIGH.
Question 18. . A J-K flip-flop with J = 1 and K = 1 has a 20 kHz clock input. The Q output is ________.
  1.    constantly LOW
  2.    constantly HIGH
  3.    a 20 kHz square wave
  4.    a 10 kHz square wave
 Discuss Question
Answer: Option D. -> a 10 kHz square wave
Question 19. . A correct output is achieved from a master-slave J-K flip-flop only if its inputs are stable while the:
  1.    clock is LOW
  2.    slave is transferring
  3.    flip-flop is reset
  4.    clock is HIGH
 Discuss Question
Answer: Option D. -> clock is HIGH
Question 20. . Which of the following describes the operation of a positive edge-triggered D flip-flop?
  1.    If both inputs are HIGH, the output will toggle
  2.    The output will follow the input on the leading edge of the clock.
  3.    When both inputs are LOW, an invalid state exists.
  4.    The input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock.
 Discuss Question
Answer: Option B. -> The output will follow the input on the leading edge of the clock.

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