Electrical Circuits

231. What is the specific resistance of a pure silicon?

1. 55 Ω-mm
2. 55 Ω-m
3. 55 Ω -cm
4. 55 kΩ-m

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232. What is the temperature coefficient of the resistance Eureka?

1. Infinity
2. Negative
3. Almost zero
4. Positive

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233. What is the time constant for L of 240 mH in series with R of 20 Ω ?

1. 12 ms
2. 4.8 s
3. 83.3 s
4. 12 s

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234. What is the total capacitance of 10 capacitors, each of 20 μF in series?

1. 200 μF
2. 2 μF
3. 100 μF
4. 0.5 μF

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235. What is the total effective capacitance of two 0.25 μF capacitors connected in series?

1. 0.125 μF
2. 1.25 μF
3. 0.50 μF
4. 2.5 if

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236. What is the total resistance of a two equal valued resistors in series?

1. The difference of both
2. The product of both
3. Twice as one
4. The sum of their reciprocals

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237. What is the value of a carbon composition resistor with the following color code: Brown, white, orange, red

1. 190 n; 10 %
2. 19 k Ω ; 2 %
3. 19 kn; 20 %
4. 1.9 kn; 2 %

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238. What maximum voltage can be applied across the capacitor for very short period of time?

1. Working voltage
2. Surge voltage
3. Stray voltage
4. Peak voltage

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239. What rating of a resistor determines its ability to absorb heat?

1. Wattage
2. Ohmic
3. Current
4. Voltage

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240. What refers to such work at very low temperatures, near absolute zero?

1. Cryogenics
2. Superconductivity
3. Subsonic
4. Thermionic

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