Electronic Circuits

71. In an LC circuit, when the capacitor energy is maximum, the inductor energy is

  1. Maximum
  2. Minimum
  3. Half-way between maximum and minimum
  4. Zero

Correct answer: (B)
Minimum

72. In an LC oscillator, if the value of L is increased four times, then the frequency of oscillation is

  1. Decreased 2 times
  2. Decreased 4 times
  3. Increased 2 times
  4. Increased 4 times

Correct answer: (A)
Decreased 2 times

73. In an LC oscillator, the frequency of oscillations is given by

  1. 1/(2n√Lc)
  2. 2η/√Lc
  3. √Lc/2η
  4. 2η/√Lc

Correct answer: (A)
1/(2n√Lc)

74. In order to have more voltage gain from a transformer amplifier the transistor used should have

  1. Thin collector
  2. Thin base
  3. Wide emitter
  4. Thin emitter

Correct answer: (B)
Thin base

75. In phase-shift oscillator, what are the frequency determining elements?

  1. L and C
  2. R, L and C
  3. R and C
  4. R and L

Correct answer: (C)
R and C

76. In practice, what is normally varied in order to change the frequency of oscillation?

  1. Capacitance
  2. Inductance
  3. Resistance
  4. Impedance

Correct answer: (A)
Capacitance

77. In the initial stages of a multistage amplifier, _________ coupling is used.

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

Correct answer: (B)
RC

78. In transistor amplifiers, what transformer is used for impedance matching?

  1. Step up
  2. Power
  3. Step down
  4. Isolation

Correct answer: (C)
Step down

79. Ina common emitter amplifier, the capacitor from emitter to ground is called the

  1. Coupling capacitor
  2. Bypass capacitor
  3. Decoupling capacitor
  4. Tuning capacitor

Correct answer: (B)
Bypass capacitor

80. Increasing the overall Beta is an advantage of

  1. Clap oscillator
  2. Crystal oscillator
  3. Darlington pair
  4. CE amplifier

Correct answer: (C)
Darlington pair

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