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Assertion: At resonance, power factor of...

Assertion: At resonance, power factor of series L-C-R circuit is zero.
Reason: At resonance, current function and voltage functions are in same phase.

A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
At resonance, `phi = 0`
`therefore cosphi =1` or power factor =1
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Knowledge Check

  • Assertion: At resonance, power factor of L-C-R series circuit is 1. Reason: At resonance, X_(C) = X_(L)

    A
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
    B
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
    C
    If Assertion is true but Reason is false.
    D
    If Assertion is false but Reason is true.

  • A series L-C-R circuit is operated at resonance . Then

    A
    voltage across R is minimum
    B
    impedance is minimum
    C
    impedance is maximum
    D
    current amplitude is minimum

  • The power factor of a series LCR circuit at resonance will be

    A
    1
    B
    0
    C
    `(1)/(2)`
    D
    `(1)/(sqrt(2))`

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    Power factor in a series R-L-C resonant circuit is

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