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LOGIC GATES MCQs

Total Questions : 93 | Page 5 of 10 pages
Question 41. . What are the pin numbers of the outputs of the gates in a 7432 IC?
  1.    3, 6, 10, and 13
  2.    1, 4, 10, and 13
  3.    3, 6, 8, and 11
  4.    1, 4, 8, and 11
 Discuss Question
Answer: Option C. -> 3, 6, 8, and 11
Question 42. . The output of a NOT gate is HIGH when ________.
  1.    the input is LOW
  2.    the input is HIGH
  3.    power is applied to the gate's IC
  4.    power is removed from the gate's IC
 Discuss Question
Answer: Option A. -> the input is LOW
Question 43. . A CMOS IC operating from a 3-volt supply will consume ________.
  1.    less power than a TTL IC
  2.    more power than a TTL IC
  3.    the same power as a TTL IC
  4.    no power at all
 Discuss Question
Answer: Option A. -> less power than a TTL IC
Question 44. .  If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be?
  1.    All inputs must be LOW.
  2.    All inputs must be HIGH.
  3.    At least one input must be LOW.
  4.    At least one input must be HIGH.
 Discuss Question
Answer: Option C. -> At least one input must be LOW.
Question 45. . Logically, the output of a NOR gate would have the same Boolean expression as a(n):
  1.    NAND gate immediately followed by an inverter
  2.    OR gate immediately followed by an inverter
  3.    AND gate immediately followed by an inverter
  4.    NOR gate immediately followed by an inverter
 Discuss Question
Answer: Option B. -> OR gate immediately followed by an inverter
Question 46. . How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?
  1.    any one of the inputs
  2.    any two of the inputs
  3.    any three of the inputs
  4.    all four inputs
 Discuss Question
Answer: Option D. -> all four inputs
Question 47. . A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?
  1.    The dim indication on the logic probe indicates that the supply voltage is probably low.
  2.    The output of the gate appears to be open.
  3.    The dim indication is the result of a bad ground connection on the logic probe.
  4.    The gate is a tristate device.
 Discuss Question
Answer: Option B. -> The output of the gate appears to be open.
Question 48. . 
Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?
  1.    NOR
  2.    NOT
  3.    NAND
  4.    AND
 Discuss Question
Answer: Option A. -> NOR
Question 49. . What is the Boolean expression for a three-input AND gate?
  1.    X = A + B + C
  2.    X = A · B · C
  3.    A – B – C
  4.    A $ B $ C
 Discuss Question
Answer: Option B. -> X = A · B · C
Question 50. . What is the difference between a 7400 and a 7411 IC?
  1.    7400 has two four-input NAND gates; 7411 has three three-input AND gates
  2.    7400 has four two-input NAND gates; 7411 has three three-input AND gates
  3.    7400 has two four-input AND gates; 7411 has three three-input NAND gates
  4.    7400 has four two-input AND gates; 7411 has three three-input NAND gates
 Discuss Question
Answer: Option B. -> 7400 has four two-input NAND gates; 7411 has three three-input AND gates

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