Electronic Devices and Circuits MCQs with answers Page - 29

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Q. Unused inputs on TTL, AND, and NAND gates

  • (A) degrade the gates noise immunity.
  • (B) if left open will have the same effect as high inputs.
  • (C) should be tied high.
  • (D) all of the above are correct.

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Q. The lower transistor of a totem-pole output is OFF when the gate output is

  • (A) high.
  • (B) malfunctioning.
  • (C) low.
  • (D) over driven.

A

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Q. The input transistor on a TTL circuit is unusual in that it has

  • (A) multiple bases.
  • (B) no collector.
  • (C) no base.
  • (D) multiple emitters.

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Q. The difference between VOH and VIH voltages is known as

  • (A) input margin.
  • (B) noise margin.
  • (C) output differential.
  • (D) input level.

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Q. The upper transistor of a totem-pole output is OFF when the gate output is

  • (A) logic 1.
  • (B) malfunctioning.
  • (C) high.
  • (D) low.

A

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Q. The major advantage of TTL logic circuits over CMOS is

  • (A) lower propagation delay.
  • (B) the ability to output higher voltages.
  • (C) more modern design.
  • (D) very low power consumption

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Q. The maximum current for a HIGH output on a standard TTL gate is

  • (A) -10 µa.
  • (B) -400 µa.
  • (C) -1 µa.
  • (D) -10 ma.

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Q. The maximum current for a LOW output on a standard TTL gate is

  • (A) 16 µa.
  • (B) 40 ma.
  • (C) 100 µa.
  • (D) 16 ma.

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Q. The major advantage of CMOS logic circuits over TTL is

  • (A) very low power consumption.
  • (B) the ability to produce several output voltage levels.
  • (C) lower propagation delay.
  • (D) much higher propagation delay.

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Q. Comparing the size of BJT and FET, choose the correct statement ?

  • (A) BJT is larger than the FET
  • (B) BJT is smaller than the FET
  • (C) Both are of same size
  • (D) Depends on application

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