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MCQs

Analog Electronics

Total Questions : 482 | Page 9 of 49 pages
Question 81. 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 82. Asource follower using an FET usually has a voltage gain which is
  1.    Greater than +100
  2.    Slightly less than unity but positive
  3.    Exactly unity but negative
  4.    About -10
 Discuss Question
Answer: Option A. -> Greater than +100
Question 83. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are
  1.    5 Ω & 20 %
  2.    25 Ω & 20 %
  3.    5 Ω & 16.7 %
  4.    25 Ω & 16.7 %
 Discuss Question
Answer: Option B. -> 25 Ω & 20 %
Question 84. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250, are cascaded. The open circuit voltage gain of combined amplifier is
  1.    49dB
  2.    51dB
  3.    98dB
  4.    102dB
 Discuss Question
Answer: Option C. -> 98dB
Question 85. Class AB operation is often used in power large signal) amplifiers in order to
  1.    Get maximum efficiency
  2.    Remove even harmonics
  3.    Overcome a crossover distortion
  4.    Reducing collector dissipation
 Discuss Question
Answer: Option C. -> Overcome a crossover distortion
Question 86. In an OP-amp differentiator
  1.    The amplitude of output is proportional to rate of change of input
  2.    The amplitude of output is proportional to input
  3.    Output occurs when input is finite and constant
  4.    Polarity of input and output is the same
 Discuss Question
Answer: Option A. -> The amplitude of output is proportional to rate of change of input
Question 87. Which of the following amplifier circuit using junction transistor has the best gain?
  1.    Common base
  2.    Common emitter
  3.    Common collector
  4.    All have the same gain
 Discuss Question
Answer: Option B. -> Common emitter
Question 88. When a transistor is connected in common emitter mode, it with have
  1.    Negligible input resistance and high output resistance
  2.    High input resistance and low output resistance
  3.    Medium input resistance and high output resistance
  4.    Low input resistance as well as output resistance
 Discuss Question
Answer: Option C. -> Medium input resistance and high output resistance
Question 89. In all base driver amplifiers
  1.    ac collector voltage is 180° out of phase with ac base voltage
  2.    ac emitter voltage is 180° out of phase with ac base voltage
  3.    ac collector voltage is in phase with ac base voltage
  4.    none of the above
 Discuss Question
Answer: Option A. -> ac collector voltage is 180° out of phase with ac base voltage
Question 90. Which of the following statements is false?
  1.    Push pull signals are equal and opposite in phase
  2.    Class AB operation cannot be used for a push pull audio power output phase
  3.    A push pull output transformer has a centre-tapped primary
  4.    All of the above
 Discuss Question
Answer: Option B. -> Class AB operation cannot be used for a push pull audio power output phase

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