Electronic Circuits

61. If Av is 50 Ai is 200, what is the power gain of a common emitter amplifier?

1. 1000
2. 10000
3. 100
4. 100000

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62. If gain without feedback and feedback factor are A and β respectively, then gain with negative feedback is given by

1. Al 1-A β
2. A/ 1+ A β
3. 1+A β l A
4. (1+A β) A

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63. If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain

1. Increases
2. Decreases
3. Becomes erratic
4. Remains the same

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64. If the noise factor of an ideal amplifier expressed in dB, then it is

1. 0
2. 0.1
3. 1
4. 10

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65. If you move towards an oscillating circuit, its frequency changes because of

1. Hand capacitance
2. Movement of the body
3. Noise of foot
4. Stray capacitance

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66. In a class A amplifier, the output signal is

1. Distorted
2. The same as the input
3. Clipped
4. Smaller in amplitude than the input

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67. In a Colpitt's oscillator, feedback is obtained

1. By magnetic induction
2. By a tickler coil
3. From the center of split capacitors
4. From the center of split inductors

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68. In a multistage amplifier, if the stages have R and C component only, _________ operation is apparent.

1. Class B
2. Class C
3. Class A
4. Class AB

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69. In a phase shift oscillator, 180° phase-shift is obtained

1. A transformer
2. LC tank circuit
3. Three RC sections
4. Three LC sections

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70. In a phase-shift oscillator, _________ RC sections are generally used.

1. Three
2. Four
3. Two
4. Five

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