Antenna and Microwave Engineering MCQs with answers Page - 9

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Q. are used in the final stages of radar and radio transmitters to increase the radiated power level.

  • (A) power amplifiers
  • (B) oscillators
  • (C) transistors
  • (D) attenuators

A

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Q. Important factors to be considered for power amplifier design are:

  • (A) efficiency
  • (B) gain
  • (C) thermal effect
  • (D) all of the mentioned

A

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Q. 1 MICROWAVE PASSIVE COMPONENTS: DIRECTIONAL COUPLER, POWER DIVIDER, MAGIC TEE ATTENUATOR, RESONATOR

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. Gain of power amplifiers with increase in operating frequency.

  • (A) increases
  • (B) decreases
  • (C) increases exponentially
  • (D) decreases exponentially

A

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Q. amplifiers are linear circuits, where the transistor is biased to conduct over the entire range of the input signal cycle.

  • (A) class a amplifiers
  • (B) class b amplifiers
  • (C) class c amplifiers
  • (D) none of the mentioned

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Q. A class B amplifier consists of transistors in order to conduct the input signal over the entire cycle.

  • (A) 1
  • (B) 2
  • (C) 4
  • (D) 6

A

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Q. Power amplifiers in the increasing order of efficiency is:

  • (A) class a, b, c
  • (B) class c, a, b
  • (C) class b, a, c
  • (D) efficiency of all the 3 amplifiers is the same

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Q. Behavior of a transistor in power amplifiers is unpredictable at all input signal levels.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. If the output power of an amplifier is 10 V, and the input power supplied to the amplifier is 0.229 V given that the DC voltage used is

  • (A) 25%
  • (B) 50%
  • (C) 75%
  • (D) 35%

A

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Q. If a power amplifier has an output power of 10 W, and an amplifier gain of 16.4 dB, then the input drive power is:

  • (A) 400 mw
  • (B) 225 mw
  • (C) 229 mw
  • (D) 240 mw

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