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MCQs

Analog Electronics

Total Questions : 482 | Page 48 of 49 pages
Question 471. Which power amplifier can deliver maximum load power?
  1.    Class A
  2.    Class AB
  3.    Class B
  4.    Class C
 Discuss Question
Answer: Option D. -> Class C
Question 472. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
  1.    surge resistor
  2.    surge inductor
  3.    surge capacitor
  4.    both (a) and (b)
 Discuss Question
Answer: Option A. -> surge resistor
Question 473. Which of the following oscillators is suitable for frequencies in the range of mega hertz?
  1.    RC phase shift
  2.    Wien bridge
  3.    Hartley
  4.    Both (a) and (c)
 Discuss Question
Answer: Option C. -> Hartley
Question 474. How is BJT used as a faster switch?
  1.    By operating it in the saturation and cut-off region
  2.    By operating it in the active and cut-off region
  3.    By using it in strong saturation
  4.    By decreasing its ON resistance
 Discuss Question
Answer: Option B. -> By operating it in the active and cut-off region
Question 475. Thermal runaway is not possible in FET because as the temperature of FET increases
  1.    The mobility decreases
  2.    The transconductance increases
  3.    The drain current increases
  4.    None of the above
 Discuss Question
Answer: Option A. -> The mobility decreases
Question 476. The encapsulation of transistor is necessary for
  1.    Preventing radio interference
  2.    Preventing photo-emission effects
  3.    Avoiding loss of free electrons
  4.    Mechanical ruggedness
 Discuss Question
Answer: Option D. -> Mechanical ruggedness
Question 477. In a transistor leakage current mainly depends on
  1.    Doping of base
  2.    Size of emitter
  3.    Rating of transistor
  4.    Temperature
 Discuss Question
Answer: Option D. -> Temperature
Question 478. The early effect in a bipolar junction transistor is caused by
  1.    Fast turn-on
  2.    Fast turn-off
  3.    Large collector-base reverse bias
  4.    Large emitter-base forward bias
 Discuss Question
Answer: Option C. -> Large collector-base reverse bias
Question 479. The bandwidth of an RF tuned amplifier is dependent on
  1.    Q –factor of the tuned o/p circuit
  2.    Q –factor of the tuned i/p circuit
  3.    Quiescent operating point
  4.    Q-factor of the o/p and i/p circuits as well as quiescent operating point
 Discuss Question
Answer: Option A. -> Q –factor of the tuned o/p circuit
Question 480. A change in the value of the emitter resistance Re in a differential amplifier
  1.    Affects the difference mode gain Ad
  2.    Affects the common mode gain Ac
  3.    Affects both Ad and Ac
  4.    Does not effect either Ad and Ac
 Discuss Question
Answer: Option B. -> Affects the common mode gain Ac

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