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MCQs

Analog Electronics

Total Questions : 482 | Page 47 of 49 pages
Question 461. The coupling capacitor in amplifier circuits
  1.    affects dc biasing
  2.    does not affect dc biasing
  3.    affects dc biasing to some extent
  4.    both (a) and (c)
 Discuss Question
Answer: Option B. -> does not affect dc biasing
Question 462. The cascade amplifier is a multistage configuration of
  1.    CC-CB
  2.    CE-CB
  3.    CB-CC
  4.    CE-CC
 Discuss Question
Answer: Option B. -> CE-CB
Question 463. For high frequencies a capacitor like
  1.    an open circuit
  2.    a short circuit
  3.    either open circuit or short circuit
  4.    none of the above
 Discuss Question
Answer: Option B. -> a short circuit
Question 464. What will happen if doping of an intrinsic semiconductor with pentavalent impurity atom ?
  1.    Fermi level not change
  2.    Fermi level fall
  3.    Fermi level raises
  4.    All of the above
 Discuss Question
Answer: Option C. -> Fermi level raises
Question 465. Which of the following power amplifiers has highest efficiency?
  1.    Class A
  2.    Class AB
  3.    Class B
  4.    Class C
 Discuss Question
Answer: Option D. -> Class C
Question 466. The input voltage for starting oscillations in an oscillator is caused by
  1.    negative feedback
  2.    positive feedback
  3.    noise voltage in resistors
  4.    a special generator
 Discuss Question
Answer: Option C. -> noise voltage in resistors
Question 467. In a push pull circuit
  1.    each transistor conducts for 180°
  2.    each transistor conducts for more than 180° but less than 360°
  3.    each transistor conducts for less than 180°
  4.    the period of conduction of each transistor depends on circuit configuration
 Discuss Question
Answer: Option A. -> each transistor conducts for 180°
Question 468. In a half wave diode rectifier circuit the current flows in the load circuit for
  1.    90° in each cycle
  2.    180° in each cycle
  3.    270° in each cycle
  4.    360° in each cycle
 Discuss Question
Answer: Option B. -> 180° in each cycle
Question 469. An RC oscillator uses
  1.    one RC combination
  2.    two RC combinations
  3.    at least three RC combinations
  4.    either (a) or (b)
 Discuss Question
Answer: Option C. -> at least three RC combinations
Question 470. In a CE amplifier the input impedance is equal to the ratio of
  1.    ac base voltage to ac base current
  2.    ac base voltage to ac emitter current
  3.    ac emitter voltage to ac collector current
  4.    ac collector voltage to ac collector current
 Discuss Question
Answer: Option A. -> ac base voltage to ac base current

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