Solid State Devices

251. What type of diode is used for tuning receivers and is normally operated with reverse bias and derived its name from voltage variable capacitor?

1. Hot-carrier diode
2. Varactor diode
3. Tunnel diode
4. Zener diode

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252. What type of diode is used for tuning receivers; operate with reverse bias and derived its name from voltage-variable capacitor?

1. Zener diode
2. Tunnel diode
3. Varactor diode
4. Crystal diode

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253. What type of material usually has four valence electrons?

1. Insulator
2. Semiconductor
3. Conductor
4. IGFET

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254. What type of material usually has one valence electron?

1. Insulator
2. Semiconductor
3. Conductor
4. Transistor

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255. When a diode is forward biased, the recombination of free electrons and holes may produce _________ ?

1. Heat
2. Light
3. Radiation
4. All of the above

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256. when a factor a junction transistor is 0.98,the factor would be equivalent to _________ value of transistor's beta.

1. 49
2. 60
3. 20
4. 38

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257. When a JFET is cut-off, the depletion layers are

1. Touching
2. Separated
3. Very far apart
4. Close together

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258. When a transistor is fully saturated,

1. The emitter current is at its minimum value
2. The transistor alpha is at its maximum value
3. The beta of the transistor is at minimal value
4. The collector current is at its maximum value

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259. When an atom has bound electrons, it is described as

1. All charges do recombination
2. Valence electrons disappear due to vaporization
3. Filled or saturated since valence orbit can hold not more than 8 electrons
4. Merging of electrons and other particles

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260. When both emitter and collector junction are forward biased, the transistor is said to be at _________ region.

1. Active
2. Cut-off
3. Breakdown
4. Saturation

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