Solid State Devices

281. Which of the following has the highest input impedance

1. FET
2. BJT
3. MOSFET
4. Crystal diode

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282. Which of the following has the least noise level?

1. FET
2. BJT
3. Triode
4. Tetrode

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283. Which of the following is considered a unipolar device?

1. Capacitor
2. Inductor
3. FET
4. BJT

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284. Which of the following is considered as the best conductor?

1. Gold
2. Silicon
3. Germanium
4. Mica

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285. Which of the following is NOT one of the three distinct regions in the characteristic curve of a diode?

1. Forward bias region
2. Reverse bias region
3. Breakdown region
4. Saturation region

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286. Which of the following is the equivalent circuit for a diode for third approximation?

1. A switch only
2. A switch in series with a battery in series with a resistance
3. A switch in series with battery
4. A switch in series with a resistance

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287. Which of the following is true about the emitter follower circuits?

1. The output signal is 180° out of phase with the input signal
2. The output signal is in phase with the input signal
3. The input signal is always equal to the output signal
4. An emitter follower circuit is equivalent to a common emitter connection

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288. Which of the following items is not a type of material?

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

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289. Which of the following materials has the smallest leakage current?

1. Germanium
2. Carbon
3. Sulfur
4. Silicon

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290. Which of the item below does not mean a VARACTOR diode?

1. VOLTACAPS
2. VARICAPS
3. Voltage variable capacitors
4. Variable resistance diode

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