Circuits and Circuit Theory

21.Form factor for a sine wave is

1. 1.414
2. 0.707
3. 1.11
4. 0.637

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22.Form Factor is the ratio of

1. average value/r.m.s. value
2. average value/peak value
3. r.m.s. value/average value
4. r.m.s. value/peak value

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23.If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

1. 42.42 sin 3141
2. 60 sin 25 t
3. 30 sin 50 t
4. 84.84 sin 25 t

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24.If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be

1. 0.001 s
2. 0.1 s
3. 10 s
4. 100 s

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25.If two sine waves of the same frequency have a phase difference of JT radians, then

1. both will reach their minimum values at the same instant
2. both will reach their maximum values at the same instant
3. when one wave reaches its maxi¬mum value, the other will reach its minimum value
4. none of the above

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26.If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

1. a sinusoid of the same frequency
2. a sinusoid of half the original frequency
3. a sinusoid of double the frequency
4. not a sinusoid

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27.In a circuit containing R, L and C, power loss can take place in

1. C only
2. L only
3. R only
4. all above

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28.In a highly capacitive circuit the

1. apparent power is equal to the actual power
2. reactive power is more than the apparent power
3. reactive power is more than the actual power
4. actual power is more than its reactive power

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29.In a loss-free R-L-C circuit the transient current is

1. oscillating
2. square wave
3. sinusoidal
4. non-oscillating

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30.In a parallel R-C circuit, the current always _________ the applied voltage

1. lags
2. leads
3. remains in phase with
4. none of the above

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