Solid State Devices

231. What is the principal characteristic of a zener diode?

1. A constant current under conditions of varying voltage
2. A high forward current rating
3. A constant voltage under conditions of carrying current
4. A very high PIV

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232. What is the reason why a common collector is used for impedance matching?

1. Its output impedance is very high
2. Its output impedance is very low
3. Its input impedance is very low
4. Its input impedance is very high

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233. What is the reason why FET has high input impedance?

1. Because its input is a forward biased
2. Because of the impurity atoms
3. Because its input is reverse biased
4. Because it is made of semiconductor material.

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234. What is the resistivity of an extrinsic semiconductor?

1. 1 n-cm
2. 2 Ω-em
3. 3 n-cm
4. 4 n-cm

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235. What is the typical bulk resistance of rectifier diodes?

1. Less than 10
2. Greater than1n
3. Equal to 1n
4. It depends on the doping level

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236. What is the typical operating current of an LED?

1. 50 mA
2. 10 mA
3. 20 mA
4. 5 mA

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237. What line is drawn between the open-circuit current on a JFET characteristic curve?

1. Operating point
2. Load line
3. Tangent line
4. Quiescent point

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238. What occurs in pn diodes when the electric field in the depletion layer increases to the point where it can break covalent bonds and generate electron hole pairs?

1. Covalent breakdown
2. Diffusion
3. Zener breakdown
4. Avalanche effect

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239. What occurs in pn diodes when the minority carriers that cross the depletion region under the influence of the electric field gain sufficient kinetic energy to be able to break covalent bonds in atoms with which they collide?

1. Drift
2. Avalanche breakdown
3. Diffusion
4. Saturation

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240. What orbit controls the electrical property of the atom?

1. Valence orbit
2. First orbit
3. Fourth orbit
4. M shell

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