Single Stage Transistor Amplifiers(Electrical Engineering ) Questions and Answers

Question 1. A CE amplifier is also called ___________ circuit
  1.    Grounded emitter
  2.    Grounded base
  3.    Grounded collector
  4.    None of the above
Explanation:-
Answer: Option A. -> Grounded emitter
Question 2. A transistor amplifier has high output impedance because ___________
  1.    Emitter is heavily doped
  2.    Collector has reverse bias
  3.    Collector is wider than emitter or base
  4.    None of the above
Explanation:-
Answer: Option B. -> Collector has reverse bias
Question 3. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of ___________
  1.    RC + RL
  2.    RC || RL
  3.    RL
  4.    RC
Explanation:-
Answer: Option D. -> RC
Question 4. An amplifier has a power gain of 100. Its db gain is ___________
  1.    10 db
  2.    20 db
  3.    40 db
  4.    None of the above
Explanation:-
Answer: Option B. -> 20 db
Question 5. A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ___________
  1.    RC
  2.    RC || RE
  3.    RC - RE
  4.    RC + RE
Explanation:-
Answer: Option D. -> RC + RE
Question 6. If the input capacitor of a transistor amplifier is short-circuited, then
  1.    Transistor will be destroyed
  2.    Biasing conditions will change
  3.    Signal will not reach the base
  4.    None of the above
Explanation:-
Answer: Option B. -> Biasing conditions will change
Question 7. The purpose of a coupling capacitor in a transistor amplifier is to ___________
  1.    Increase the output impedance of transistor
  2.    Protect the transistor
  3.    Pass a.c. and block d.c.
  4.    Provide biasing
Explanation:-
Answer: Option C. -> Pass a.c. and block d.c.
Question 8. The purpose of capacitors in a transistor amplifier is to ___________
  1.    Protect the transistor
  2.    Cool the transistor
  3.    Couple or bypass a.c. component
  4.    Provide biasing
Explanation:-
Answer: Option C. -> Couple or bypass a.c. component
Question 9. The phase difference between the output and input voltages of a CE amplifier is ___________
  1.    180°
  2.    0°
  3.    90°
  4.    270°
Explanation:-
Answer: Option A. -> 180°
Question 10. The ratio of output impedance of a CE amplifier is ___________
  1.    About 1
  2.    Low
  3.    High
  4.    Moderate
Explanation:-
Answer: Option D. -> Moderate
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