Electronic Circuits

241. Which of the following is NOT an oscillator requirement?

1. Attenuator
2. Amplifier
3. Tank circuit
4. Feedback

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242. Which of the following is provided by a CB transistor amplifier?

1. Voltage gain
2. Power gain
3. Current gain
4. Gain stability

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243. Which of the following is the other name of the output stage in an amplifier?

1. Load stage
2. Audio stage
3. Power stage
4. RF stage

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244. Which of the item below does not describe a common emitter amplifier?

1. High voltage gain
2. High current gain
3. Very high power gain
4. High input resistance

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245. Which of the items below is not a description of the two-stage amplifier?

1. The input resistance is equal to the input resistance of the first stage unless feedback is applied
2. Its output resistance is equal to the output resistance of the final stage unless feedback is applied
3. Its noise level is equal to the accumulated noise of the two stages, either by multiplying the noise voltage amplitudes together or by adding the noise decibel levels together
4. The output resistance is equal to the output resistance of the first stage unless feedback is applied.

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246. Which operation gives the maximum distortion?

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

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247. Which power amplifier has the highest collector efficiency?

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

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248. Which transistor configuration offers no phase reversal at the output?

1. Common-base
2. Common-collector
3. Common-emitter
4. Both A and B

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249. Why is it that the size of a power transistor is made considerably large?

1. To provide easy handling
2. To dissipate more heat
3. To simply construction
4. To facilitate connections

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250. Why is transformer coupling provides high frequency?

1. DC resistance is low
2. Collector voltage is stepped up
3. Collector voltage is stepped down
4. AC resistance is high

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