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As the frequency of an alternating curre...

As the frequency of an alternating current increases, the impedance of the circuit

A

increases continuously

B

decreases continuously

C

remains constant

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D

Impedance first decreases, then increases. At resonance frequency `Z` is minimum.
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DC PANDEY-ALTERNATING CURRENT-Level - 1 Objective
  1. The term cosphi in an AC circuit is called

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  2. A DC ammeter cannot measure alternating current because

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  3. As the frequency of an alternating current increases, the impedance of...

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  4. Phasor diagram of a series AC circuit is shown in figure. Then,

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  5. The rms value of an alternating current

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  6. In an AC circuit, the applied potential difference and the current flo...

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  7. The impedasnce of sereis L-C-R circuit in an AC circuit is

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  8. If V0 and I0 are the peak current and voltage across the resistor in a...

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  9. A generator produces a time varying voltage given by V=240 sin 120 t, ...

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  10. An L-C-R series circuit has a maximum current of 5A. If L=0.5H and C=8...

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  11. The current and voltage functions in an AC circuit are i=100 sin 100...

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  12. A capacitor becomes a perfect insulator is

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  13. For an alternating voltave V=10 cos 100 pit volt, the instantenous vol...

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  14. In a purely resistive AS circuit,

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  15. Identify the graph which correctly reperesents the variation of capaci...

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  16. In an AC circuit, the impedance is sqrt3 times the reactance, then the...

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  17. Voltage applied to an AC circuit and current flowing in it is given by...

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  18. A current of 4A flows in a coil when connected to a 12V DC source. If ...

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  19. In the circuit shown in figureure, the reading of the AC ammeter is ...

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  20. An AC voltage is applied acrss a series combination of L and R. If the...

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