| 1. | The period of a sine wave is 5 seconds. Its frequency is ? | |
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20 Hz
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30 Hz
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40 Hz
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50 Hz
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Report Question| 2. | Ohm is unit of all of the following except ? | |
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inductive reactance
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capacitive reactance
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resistance
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capacitance
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| 3. | In a purely inductive circuit ? | |
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actual power is zero
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reactive power is zero
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apparent power is zero
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none of above is zero
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| 4. | Form factor for a sine wave is ? | |
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1.414
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0.707
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1.11
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0.637
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| 5. | In a circuit containing R, L and C, power loss can take place in ? | |
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C only
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L only
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R only
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all of the above
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| 6. | Power factor of magnetising component of current of a transformer is ? | |
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0.8 lag
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0.8 lead
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zero
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unity
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| 7. | For the same peak value, which of the following wave bas the least mean value ? | |
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half wave rectified sine wave
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triangular wave
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sine wave
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square wave
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| 8. | All the rules and laws of D.C. circuit also apply to A.C. circuit containing ? | |
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capacitance only
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inductance only
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resistance only
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all of the above
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| 9. | The frequency of domestic power supply in India is ? | |
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200 Hz
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100 Hz
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60 Hz
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50 Hz
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| 10. | The power factor of a D.C. circuit is always ? | |
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less than unity
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unity
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greater than unity
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zero
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