Electronic Circuits

111. The ear is not sensitive to _________ distortion.

  1. Frequency
  2. Amplitude
  3. Harmonic
  4. Phase

Correct answer: (A)
Frequency

112. The efficiency of class AB operation has a maximum of between _________ percent.

  1. 90 to 100%
  2. 60 to 80%
  3. 50 to 78.5%
  4. 40.5 to 60%

Correct answer: (C)
50 to 78.5%

113. The final stage of an amplifier uses _________ coupling.

  1. Direct
  2. RC
  3. Transformer
  4. Impedance

Correct answer: (C)
Transformer

114. The frequency of oscillation is _________ L and C in an LC oscillator.

  1. Inversely proportional to square root of
  2. Directly proportional to
  3. Independent of the values of
  4. Proportional to square of

Correct answer: (A)
Inversely proportional to square root of

115. The frequency of the ripple voltage at the output of a full-wave rectifier at 60 cycles.

  1. 120 cycles
  2. 60 cycles
  3. 240 cycles
  4. 480 cycles

Correct answer: (A)
120 cycles

116. The frequency response of the combined amplifier can be compared with

  1. An OR gate
  2. A negative feedback amplifier
  3. A positive filter
  4. An AND gate

Correct answer: (D)
An AND gate

117. The frequency response of transformer coupling is

  1. Good
  2. Excellent
  3. Poor
  4. Very good

Correct answer: (C)
Poor

118. The frequency stability of the oscillator output is maximum in _________ oscillator.

  1. LC
  2. Crystal
  3. Phase-shift
  4. Wien bridge

Correct answer: (D)
Wien bridge

119. The gain of an amplifier _________ when negative feedback is added.

  1. Increases
  2. Remains unchanged
  3. Reduces
  4. Becomes infinite

Correct answer: (C)
Reduces

120. The gain of an amplifier is expressed in dB unit because

  1. It is a simple unit
  2. Calculations become easy
  3. Human ear response is logarithmic
  4. It is the most appropriate unit

Correct answer: (C)
Human ear response is logarithmic

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