Electronic Circuits

151. The voltage gain over mid- frequency range in an RC coupled amplifier

1. Changes instantly with frequency
2. Is constant
3. Is independent of the coupling
4. Is maximum

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152. To amplify dc signals, multistage amplifier uses what coupling?

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

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153. To obtain good gain stability in a negative feedback amplifier, AB is

1. Equal to 1
2. Very much greater than 1
3. Less than 1
4. Zero

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154. To obtain the frequency response curve of an amplifier _________ is kept constant.

1. Generator output level
2. Amplifier output
3. Generator frequency
4. Amplifier frequency

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155. To sustain oscillations, the power gain of the amplifier may be

1. Between 0.1 and 0.5
2. Any value form 0.5 upward
3. Equal to or greater than 1
4. Infinite

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156. Transformer coupling can be used in _________ amplifiers

1. Only power
2. Only voltage
3. Either power or voltage
4. Neither power nor voltage

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157. Transformer coupling introduces what type of distortion?

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

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158. Transformer coupling is generally employed when load resistance is

1. Large
2. Very large
3. Small
4. Zero

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159. Transformer coupling is used for _________ amplification.

1. Current
2. Power
3. Voltage
4. Signal

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160. Transformer coupling provides high gain because

1. Transformer is very efficient
2. Impedance matching can be achieved
3. Transformer steps up the voltage
4. Transformer steps up the current

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