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LOGIC GATES MCQs

Total Questions : 93 | Page 6 of 10 pages
Question 51. . The output of an exclusive-OR gate is HIGH if ________.
  1.    all inputs are LOW
  2.    all inputs are LOW
  3.    the inputs are unequal
  4.    none of the above
 Discuss Question
Answer: Option C. -> the inputs are unequal
Question 52. . A 2-input NOR gate is equivalent to a ________.
  1.    negative-OR gate
  2.    negative-AND gate
  3.    negative-NAND gate
  4.    none of the above
 Discuss Question
Answer: Option B. -> negative-AND gate
Question 53. . Fan-out is specified in terms of ________.
  1.    voltage
  2.    current
  3.    wattage
  4.    unit loads
 Discuss Question
Answer: Option D. -> unit loads
Question 54. . The AND function can be used to ________ and the OR function can be used to ________ .
  1.    enable, disable
  2.    disable, enable
  3.    enable or disable, enable or disable
  4.    detect, invert
 Discuss Question
Answer: Option C. -> enable or disable, enable or disable
Question 55. . A clock signal with a period of 1 s is applied to the input of an enable gate. The output must contain six pulses. How long must the enable pulse be active?
  1.    Enable must be active for 0 s.
  2.    Enable must be active for 3 s.
  3.    Enable must be active for 6 s.
  4.    Enable must be active for 12 s.
 Discuss Question
Answer: Option C. -> Enable must be active for 6 s.
Question 56. . If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output
  1.    1
  2.    2
  3.    7
  4.    8
 Discuss Question
Answer: Option C. -> 7
Question 57. . One advantage TTL has over CMOS is that TTL is ________.
  1.    less expensive
  2.    not sensitive to electrostatic discharge
  3.    faster
  4.    more widely available
 Discuss Question
Answer: Option B. -> not sensitive to electrostatic discharge
Question 58. . 
What is the circuit number of the IC that contains four two-input AND gates in standard TTL?
  1.    7402
  2.    7404
  3.    7408
  4.    7432
 Discuss Question
Answer: Option C. -> 7408
Question 59. . How many input combinations would a truth table have for a six-input AND gate?
  1.    32
  2.    48
  3.    64
  4.    128
 Discuss Question
Answer: Option C. -> 64
Question 60. . The terms "low speed" and "high speed," applied to logic circuits, refer to the ________.
  1.    rise time
  2.    fall time
  3.    propagation delay time
  4.    clock speed
 Discuss Question
Answer: Option C. -> propagation delay time

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