Electrical Circuits

241. What refers to the lowest voltage across any insulator that can cause current flow?

1. Conduction voltage
2. Critical voltage
3. Breakdown voltage
4. Voltage capacity

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242. What theorem is generally used in the analysis of vacuum tubes?

1. Superposition theorem
2. Millman's theorem
3. Thevenin's theorem
4. Norton's theorem

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243. What theorem is usually used in the analysis of transistor circuit?

1. Superposition theorem
2. Millman's theorem
3. Thevenin's theorem
4. Norton's theorem

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244. What value of R is needed with a 0.05 μF C for an RC time constant of 0.02 s?

1. 400 Ω
2. 400 MΩ
3. 400 GΩ
4. 400 k Ω

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245. When capacitors are connected in parallel, the total capacitance is

1. Greater than the largest capacitor
2. Smaller than the largest capacitor
3. Smaller than the smallest capacitor
4. Greater than the smallest capacitor

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246. When capacitors are connected in series, the total capacitance is

1. Smaller than the smallest capacitor
2. Smaller than the largest capacitor
3. Greater than any of the capacitor
4. Greater than the largest capacitor

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247. When current and voltage arte in phase in an ac circuit, the is equal to zero.

1. Resistance
2. Reactance
3. Inductance
4. Capacitance

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248. When frequency of an ac wave decreases, the value of XL in a coil

1. Approaches zero
2. Gets larger positively
3. Gets larger negatively
4. Stays constant

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249. When resistance are connected in parallel, the total resistance is

1. Less than the smallest resistance in the connection
2. Greater than the smallest resistance in the connection
3. Between the smallest and greatest resistance in the connection
4. Increasing and decreasing depending upon the supply voltage

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250. When the movable plates of a gang capacitor completely overlap the fixed plates, the capacitance of the capacitor is

1. Halfway between maximum and minimum
2. Maximum
3. Minimum
4. Zero

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