Multistage Transistor Amplifiers

11. If the power level of an amplifier reduces to half, the db gain will fall by __________

1. 5 db
2. 2 db
3. 10 db
4. 3 db

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12. In an RC coupled amplifier, the voltage gain over mid-frequency range __________

1. Changes abruptly with frequency
2. Is constant
3. Changes uniformly with frequency
4. None of the above

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13. In an RC coupling scheme, the coupling capacitor CC must be large enough __________

1. To pass d.c. between the stages
2. Not to attenuate the low frequencies
3. To dissipate high power
4. None of the above

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14. In obtaining the frequency response curve of an amplifier, the __________

1. Amplifier level output is kept constant
2. Amplifier frequency is held constant
3. Generator frequency is held constant
4. Generator output level is held constant

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15. In practice, voltage gain is expressed __________

1. In db
2. In volts
3. As a number
4. None of the above

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16. In RC coupling, the value of coupling capacitor is about __________

1. 100 pF
2. 0.1 μF
3. 0.01 μF
4. 10 μF

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17. In the initial stages of a multistage amplifier, we use __________

1. RC coupling
2. Transformer coupling
3. Direct coupling
4. None of the above

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18. In transistor amplifiers, we use __________ transformer for impedance matching

1. Step up
2. Step down
3. Same turn ratio
4. None of the above

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19. RC coupling is generally confined to low power applications because of __________

1. Large value of coupling capacitor
2. Low efficiency
3. Large number of components
4. None of the above

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20. RC coupling is not used to amplify extremely low frequencies because __________

1. There is considerable power loss
2. There is hum in the output
3. Electrical size of coupling capacitor becomes very large
4. None of the above

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