Multistage Transistor Amplifiers(Electrical Engineering ) Questions and Answers

Question 1. The gain of an amplifier is expressed in db because ___________
  1.    It is a simple unit
  2.    Calculations become easy
  3.    Human ear response is logarithmic
  4.    None of the above
Explanation:-
Answer: Option C. -> Human ear response is logarithmic
Question 2. A current amplification of 2000 is a gain of ___________
  1.    3 db
  2.    66 db
  3.    20 db
  4.    200 db
Explanation:-
Answer: Option B. -> 66 db
Question 3. If the power level of an amplifier reduces to half, the db gain will fall by .
  1.    5 db
  2.    2 db
  3.    10 db
  4.    3 db
Explanation:-
Answer: Option D. -> 3 db
Question 4. The number of stages that can be directly coupled is limited because
  1.    Changes in temperature cause thermal instability
  2.    Circuit becomes heavy and costly
  3.    It becomes difficult to bias the circuit
  4.    None of the above
Explanation:-
Answer: Option A. -> Changes in temperature cause thermal instability
Question 5. RC coupling is not used to amplify extremely low frequencies because
  1.    There is considerable power loss
  2.    There is hum in the output
  3.    Electrical size of coupling capacitor becomes very large
  4.    None of the above
Explanation:-
Answer: Option C. -> Electrical size of coupling capacitor becomes very large
Question 6. RC coupling is used for ___________ amplification
  1.    Voltage
  2.    Current
  3.    Power
  4.    None of the above
Explanation:-
Answer: Option A. -> Voltage
Question 7. In the initial stages of a multistage amplifier, we use ___________
  1.    RC coupling
  2.    Transformer coupling
  3.    Direct coupling
  4.    None of the above
Explanation:-
Answer: Option A. -> RC coupling
Question 8. The lower and upper cut off frequencies are also called ___________ frequencies
  1.    Sideband
  2.    Resonant
  3.    Half-resonant
  4.    Half-power
Explanation:-
Answer: Option D. -> Half-power
Question 9. Transformer coupling is used for ___________ amplification
  1.    Power
  2.    Voltage
  3.    Current
  4.    None of the above
Explanation:-
Answer: Option A. -> Power
Question 10. A radio receiver has ___________ of amplification
  1.    One stage
  2.    Two stages
  3.    Three stages
  4.    More than one stages
Explanation:-
Answer: Option D. -> More than one stages
© Lakshya_Education.com, All Right Reserved.
Contact Us services