Power Amplifiers MCQ

Test your knowledge with important Power Amplifiers MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Power Amplifiers MCQs at Bissoy

• Determine the work done by the intercom system depending on the position of the switch
  ক

  Remote speaker act as microphone

  খ

  Master speaker act as microphone

  গ

  Remote and master speaker act as microphone

  ঘ

  None of the mentioned
• A LM380 power amplifier is used in a intercom system with amplifier gain = 50 and the transformer turns ratio is given as 35.Find the overall gain of the circuit.
  ক

  1880

  খ

  1750

  গ

  1370

  ঘ

  1580
• Which amplifier provides twice output swing as that of LM380 amplifier?
  ক

  Hybrid power amplifier

  খ

  Bridge power audio amplifier

  গ

  Monolithic power audio amplifier

  ঘ

  Dual power amplifier
• Bridge power audio amplifier can deliver power upto
  ক

  Twice as much as output of single LM380 amplifier

  খ

  Thrice as much as output of single LM380 amplifier

  গ

  Four times as much as output of single LM380 amplifier

  ঘ

  Half of the output of single LM380 amplifier
• Which among the following is ideal for consumer applications?
  ক

  NE5018

  খ

  LM380

  গ

  MC1408

  ঘ

  SE5018
• Find the IC that can be used for short circuit proof protection?
  ক

  All of the mentioned

  খ

  IC LM384

  গ

  ICL8063

  ঘ

  ICLM380
• Burr-Brown 3553 power amplifier is suited for
  ক

  Line driving applications

  খ

  Power supply requirement

  গ

  Bandwidth adjustments

  ঘ

  High frequency application
• What is the power dissipation of power transistor?
  ক

  ≅ 0.5W

  খ

  ≤ 0.5W

  গ

  > 0.5W

  ঘ

  ≠ 0.5W
• Which type of power transistor is chosen for a discrete power booster?
  ক

  Collector follower stage

  খ

  Emitter follower stage

  গ

  Base follower stage

  ঘ

  None of the mentioned
• Output current in general purpose op-amp can be increased using
  ক

  Power comparator

  খ

  Power amplifier

  গ

  Power resistor

  ঘ

  Power booster
• 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:
  ক

  400 mW

  খ

  225 mW

  গ

  229 mW

  ঘ

  240 mW
• 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 38.5 V, efficiency of the power amplifier is:
  ক

  25%

  খ

  50%

  গ

  75%

  ঘ

  35%
• Behavior of a transistor in power amplifiers is unpredictable at all input signal levels.
  ক

  True

  খ

  False
• Power amplifiers in the increasing order of efficiency is:
  ক

  Class A, B, C

  খ

  Class C, A, B

  গ

  Class B, A, C

  ঘ

  Efficiency of all the 3 amplifiers is the same
• A class B amplifier consists of _______ transistors in order to conduct the input signal over the entire cycle.
  ক

  1

  খ

  2

  গ

  4

  ঘ

  6
• ___________ amplifiers are linear circuits, where the transistor is biased to conduct over the entire range of the input signal cycle.
  ক

  Class A amplifiers

  খ

  Class B amplifiers

  গ

  Class C amplifiers

  ঘ

  None of the mentioned
• Gain of power amplifiers __________ with increase in operating frequency.
  ক

  Increases

  খ

  Decreases

  গ

  Increases exponentially

  ঘ

  Decreases exponentially
• Amplifier efficiency is the ratio of RF output power to DC input power. This parameter determines the performance of an amplifier.
  ক

  True

  খ

  False
• Important factors to be considered for power amplifier design are:
  ক

  Efficiency

  খ

  Gain

  গ

  Thermal effect

  ঘ

  All of the mentioned
• _______________ are used in the final stages of radar and radio transmitters to increase the radiated power level.
  ক

  Power amplifiers

  খ

  Oscillators

  গ

  Transistors

  ঘ

  Attenuators