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In a series LCR A.C. circuit, by keeping...

In a series LCR A.C. circuit, by keeping resistance constant, power factor can be increased by decreasing .......

A

inductance

B

capacitance

C

both (A) and (B)

D

`|X_L-X_C|`

Text Solution

Verified by Experts

The correct Answer is:
B
We have , power factor,
cos `delta=R/Z`
`therefore cos delta=R/sqrt(R^2+(X_L-X_C)^2)`
`rArr` When we decrease `|X_L-X_C|` , power factor cos`delta` will increase. (That is why when `X_L -X_C = 0` i. when `X_L = X_C` we have resonance in the circuit which causes maximum power transfer between source and load due to maximum power factor.
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KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (DARPAN BASED ON TEXTBOOK)
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