Transistor Audio Power Amplifiers MCQ

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

• The driver stage usually employs___________
  ক

  Class A power amplifier

  খ

  Push-pull amplifier

  গ

  Class C amplifier

  ঘ

  None of the above
• Power amplifiers generally use transformer coupling because transformer per-mits
  ক

  Cooling of the circuit

  খ

  Impedance matching

  গ

  Distortionless output

  ঘ

  Good frequency response
• A power amplifier has comparatively ___________ ß
  ক

  Small

  খ

  Large

  গ

  Very large

  ঘ

  None of the above
• If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
  ক

  Amplitude

  খ

  Intermodulation

  গ

  Frequency

  ঘ

  None of the above
• Low efficiency of a power amplifier results in ___________
  ক

  Low forward bias

  খ

  Less battery consumption

  গ

  More battery consumption

  ঘ

  None of the above
• When a transistor is cut off___________
  ক

  Maximum voltage appears across transistor

  খ

  Maximum current flows

  গ

  Maximum voltage appears across load

  ঘ

  None of the above
• A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
  ক

  5 kΩ

  খ

  20 kΩ

  গ

  100 kΩ

  ঘ

  10 kΩ
• What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts?
  ক

  20%

  খ

  80%

  গ

  40%

  ঘ

  50%
• For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
  ক

  10 W

  খ

  4 W

  গ

  8 W

  ঘ

  None of the above
• The pulsating d.c. applied to power amplifier causes ___________
  ক

  Burning of transistor

  খ

  Hum in the circuit

  গ

  Excessive forward voltage

  ঘ

  None of the above
• Power amplifiers handle ___________ signals compare to voltage amplifiers
  ক

  Small

  খ

  Very small

  গ

  Large

  ঘ

  None of the above
• The output stage of a multistage amplifier is also called ___________
  ক

  Mixer stage

  খ

  Power stage

  গ

  Detector stage

  ঘ

  F stage
• If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________
  ক

  1V

  খ

  100V

  গ

  20V

  ঘ

  10V
• The size of a power transistor is made considerably large to ___________
  ক

  Provide easy handling

  খ

  Dissipate heat

  গ

  Facilitate connections

  ঘ

  None of the above
• What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 Ω?
  ক

  2

  খ

  7

  গ

  3

  ঘ

  None of the above
• The most important consideration in power amplifier is ___________
  ক

  Biasing the circuit

  খ

  Collector efficiency

  গ

  To keep the transformer cool

  ঘ

  None of the above
• The maximum efficiency of transformer coupled class A power amplifier is ___________
  ক

  30%

  খ

  50%

  গ

  80%

  ঘ

  45%
• A class A power amplifier uses ___________
  ক

  Two transistors

  খ

  Three transistors

  গ

  One transistor

  ঘ

  None of the above
• The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
  ক

  10 W

  খ

  15 W

  গ

  5 W

  ঘ

  20 W
• An AF amplifier is shielded to ___________
  ক

  Keep the amplifier cool

  খ

  Protect from rusting

  গ

  Prevent induction due to stray magnetic fields

  ঘ

  None of the above
• Class ___________ operation gives the maximum distortion
  ক

  A

  খ

  B

  গ

  C

  ঘ

  AB
• Class C power amplifier has the highest collector efficiency
  ক

  C

  খ

  A

  গ

  B

  ঘ

  AB
• The maximum collector efficiency of class B operation is ___________
  ক

  50%

  খ

  90%

  গ

  5%

  ঘ

  5%
• If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ___________
  ক

  5 W

  খ

  33 W

  গ

  75 W

  ঘ

  1 W
• When no signal is applied, the approximate collector efficiency of class A power amplifier is
  ক

  10%

  খ

  0%

  গ

  25%

  ঘ

  50%
• The most costly coupling is ___________ coupling
  ক

  RC

  খ

  Direct

  গ

  Impedance

  ঘ

  Transformer
• The push-pull circuit must use ___________ operation
  ক

  Class A

  খ

  Class C

  গ

  Class B

  ঘ

  Class AB
• If a transistor is operated in such a way that output current flows for 60° of the input signal, then it is ___________ operation
  ক

  Class A

  খ

  Class B

  গ

  Class C

  ঘ

  None of the above
• A class A power amplifier is sometimes called ___________ amplifier
  ক

  Symmetrical

  খ

  Single-ended

  গ

  Reciprocating

  ঘ

  Differential
• A 2-transistor class B power amplifier is commonly called ___________ amplifier
  ক

  Dual

  খ

  Push-pull

  গ

  Symmetrical

  ঘ

  Differential