Electronic Circuits

181. What is the main consideration in the output stage of an amplifier?

1. Power output
2. Voltage gain
3. Power gain
4. Current gain

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182. What is the maximum collector efficiency of a resistance loaded class A power amplifier?

1. 50%
2. 78.5%
3. 25%
4. 30%

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183. What is the maximum collector efficiency of a transformer coupled class A power amplifier?

1. 30%
2. 80%
3. 45%
4. 50%

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184. What is the maximum collector efficiency of class B?

1. 50%
2. 90%
3. 60.5%
4. 78.5%

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185. What is the most costly coupling?

1. RC coupling
2. Direct
3. Transformer
4. Inductive

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186. What is the most important characteristic of a common collector amplifier?

1. High input voltage
2. High input resistance
3. High output resistance
4. Its being an amplifier circuit

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187. What is the most important consideration in power amplifiers?

1. Collector efficiency
2. Biasing the circuit
3. To keep the transformer cool
4. Amplifier distortion

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188. What is the most stable sine-wave oscillator which uses piezo-electric quartz crystal?

1. Crystal oscillator
2. Wien-bridge oscillator
3. DC restorer
4. Hartley and Colpitts oscillator

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189. What is the operating point in the characteristic curve called?

1. Quiescent point
2. Load point
3. Biasing point
4. Saturation point

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190. What is the phase difference between the output and the input voltage of a CE amplifier?

1. 180°
2. 270°
3. 0°
4. 90°

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