Electrical Circuits

191. Thevenin's theorem is what form of an equivalent circuit?

1. Current
2. Voltage
3. Both current and voltage
4. Neither current nor voltage

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192. Transient period is considered over after

1. 5 -τ
2. 1 τ
3. 100 τ
4. 6 τ

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193. Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is

1. Positive
2. Negative
3. Zero
4. Infinite

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194. Two capacitors of capacitance 9 μF and 18 μF in series will have a total capacitance of

1. 27 μF
2. 162 μF
3. 6 μF
4. 180 μF

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195. Two complex numbers or phasors are said to be conjugate if they

1. Differ only in the algebraic sign of their quadratic components
2. Differ only in the algebraic sign of their real components
3. Are equal in their real and quadrature components including algebraic signs
4. Are equal in their real components but differ in their quadrature components including algebraic signs.

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196. Under the conditions of maximum power transfer, a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?

1. 60 W
2. 30 W
3. 15 W
4. 4 W

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197. VL = VC in a series RLC circuit when

1. The value of the impedance is minimum
2. The power factor is zero
3. The current leads the total voltage by 90°
4. The total voltage is zero

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198. Voltage resonance means

1. Series resonance
2. Parallel resonance
3. Current magnification
4. Gain magnification

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199. What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?

1. Smith chart
2. Reactance chart
3. Impedance chart
4. Resonance chart

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200. What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?

1. Surge
2. Stray
3. Natural
4. Normal

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