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MCQs

Total Questions : 24 | Page 1 of 3 pages
Question 1.  The output of an exclusive-NOR gate is 1. Which input combination is correct?
  1.    A = 1, B = 0
  2.    A = 0, B = 1
  3.    A = 0, B = 0
  4.    none of the above
 Discuss Question
Answer: Option C. -> A = 0, B = 0
Question 2.  One positive pulse with tw = 75 µs is applied to one of the inputs of an exclusive-OR circuit. A second positive pulse with tw = 15 µs is applied to the other input beginning 20 µs after the leading edge of the first pulse. Which statement describes the output in relation to the inputs?
  1.    The exclusive-OR output is a 20 s pulse followed by a 40 s pulse, with a separation of 15 s between the pulses.
  2.    The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, with a separation of 40 s between the pulses.
  3.    The exclusive-OR output is a 15 s pulse followed by a 40 s pulse.
  4.    *The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, followed by a 40 s pulse.
 Discuss Question
Answer: Option D. -> *The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, followed by a 40 s pulse.
Question 3.  The inverter can be produced with how many NAND gates?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option A. -> 1
Question 4.  How many NOT gates are required to implement the Boolean expression, X = ABC + ABC ?
  1.    1
  2.    2
  3.    4
  4.    5
 Discuss Question
Answer: Option B. -> 2
Question 5.  How many AND gates are required to implement the Boolean expression, X = ABC + ABC + ABC ?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option C. -> 3
Question 6.  A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct?
  1.    A = 0, B = 0, C = 0, D = 0
  2.    A = 0, B = 1, C = 1, D = 0
  3.    A = 1, B = 1, C = 0, D = 0
  4.    A = 1, B = 0, C = 0, D = 0
 Discuss Question
Answer: Option C. -> A = 1, B = 1, C = 0, D = 0
Question 7.  A 4-variable AND-OR circuit produces a 0 at its Y output. Which combination of inputs is correct?
  1.    A = 0, B = 0, C = 1, D = 1
  2.    A = 1, B = 1, C = 0, D = 0
  3.    A = 1, B = 1, C = 1, D = 1
  4.    A = 1, B = 0, C = 1, D = 0
 Discuss Question
Answer: Option D. -> A = 1, B = 0, C = 1, D = 0
Question 8. . How many 2-input NOR gates does it take to produce a 2-input NAND gate?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option D. -> 4
Question 9.  Implementation of the Boolean expression X = ABC
+ AB + AC results in ________.
  1.    three AND gates, one OR gate
  2.    three AND gates, one NOT gate, one OR gate
  3.    three AND gates, one NOT gate, three OR gates
  4.    three AND gates, three OR gates
 Discuss Question
Answer: Option B. -> three AND gates, one NOT gate, one OR gate
Question 10.  One possible output expression for an AND-OR-Invert circuit having one AND gate with inputs A, B, and C and one AND gate with inputs D and E is ________.
  1.    ABC + DE
  2.    A + B + C + D + E
  3.    (A + B + C)(D + E)
  4.    (A + B + C) (D + E)
 Discuss Question
Answer: Option C. -> (A + B + C)(D + E)

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