| 1. | The unit of frequency of an A.C. signal is ? | |
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cycle
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cycle-seo
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hertz/sec
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hertz
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Report Question| 2. | In a series resonant circuit, the impedance of the circuit is ? | |
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maximum
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minimum
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zero
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infinite
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| 3. | At very low frequencies a series R-C circuit behaves as almost purely ...... ? | |
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resistive
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inductive
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capacitive
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none of the above
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| 4. | In any A.C. circuit always ? | |
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apparent power is more than actual power
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reactive power is more than apparent power
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actual power is more than reactive power
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reactive power is more than actual power
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| 5. | While drawing vector diagram for a series circuit, the reference vector is ? | |
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voltage
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current
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power
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phase angle
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| 6. | The inductance of a coil can be increased by ? | |
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increasing core length
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decreasing the number of turns
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decreasing the diameter of the former
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choosing core material having high relative permeability
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| 7. | When an alternating current passes through an ohmic resistance the electrical power converted into heat is ? | |
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apparent power
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true power
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reactive power
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none of the above
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| 8. | ln a series L-C circuit at the resonant frequency the ? | |
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current is maximum
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current is minimum
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impedance is maximum
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voltage across C is minimum
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| 9. | Power factor of electric bulb is ? | |
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zero
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lagging
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leading
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unity
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| 10. | Capacitors for power factor correction are rated in ? | |
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kW
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kV
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kVA
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kVAR
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