Electronic Circuits

131. The number of transistor in a single stage amplifier is

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

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132. The operating frequency of a Wien-bridge oscillator is given by

1. 1/(2η√Lc)
2. 1/2ηRc
3. 1/(4η Lc)
4. 1/29Rc

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133. The operating point in a transistor amplifier moves along _________ when an ac signal is applied

1. dc load line
2. ac load line
3. both dc and ac load lines
4. cut-off

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134. The operating point is generally located at _________ of dc load line in class A operation

1. The middle
2. Saturation point
3. Cut off point
4. End point

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135. The output power of a transistor amplifier is more than the input power due to additional power supplied by

1. Transistor
2. Collector supply
3. Emitter supply
4. Base supply

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136. The output signal of a common-collector amplifier is always

1. Larger than the input signal
2. In phase with the input signal
3. Out of phase with the input signal
4. Exactly equal to the input signal

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137. The output signal of CE amplifier is always

1. Out of phase with the input signal
2. Equal to the input signal
3. In phase with the input signal
4. Larger than the input signal

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138. The output transformer used in a power amplifier is alan _________ transformer

1. 1:1 ratio
2. Step-down
3. Step-up
4. Isolation

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139. The power input to a power amplifier is _________ quantity.

1. ac
2. Pulsating dc
3. dc
4. sinusoidal

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140. The push-pull circuit must use _________ operation.

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

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