Solid State Devices

271. When the number of free electrons is increased in doped semiconductor, it becomes a/an _________ semiconductor.

1. N type
2. P type
3. PN type
4. NP type

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272. When the transistors are used in video amplifiers, its main limitation is

1. Low peak voltage
2. Poor frequency response
3. Low peak current
4. Poor filtering of signals

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273. When transistor applications call for a temperature operating condition which exceeds 185°F, which element is most suitable?

1. Gallium
2. Antimony
3. Silicon
4. Impossible to operate transistor above 185°F

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274. Which is a donor atom?

1. Trivalent atom
2. Aluminum
3. Boron
4. Pentavalent atom

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275. Which of the choices below does not describe a clipper circuit?

1. Limiter
2. Amplitude selector
3. Slicer
4. Baseline stabilizer

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276. Which of the choices below is another name for a photoconductive cell?

1. Varicap
2. Varistor
3. Photoresistive device
4. Photodiode

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277. Which of the following choices is an advantage of a MOSFET over a BJT in an RF amplifier circuit?

1. Low voltage operation
2. Low noise
3. Low amplification of signals
4. Compatibility

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278. Which of the following doping elements have a valence of 3?

1. Gallium
2. Boron
3. Aluminum
4. Phosphorous

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279. Which of the following doping elements have a valence of 4?

1. Arsenic
2. Gallium
3. Aluminum
4. Silicon

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280. Which of the following doping elements have a valence of 5?

1. Gallium
2. Boron
3. Aluminum
4. Phosphorous

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