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Two coils A and B are connected in serie...

Two coils `A` and `B` are connected in series across a `240V ,50 `Hz supply The resistance of A is `5Omega` and the inductance of `B` is 0.02 H The power factor is `0.75` The impedance of the circuit is (if power consumed is 3kW) .

A

`0.144 omega`

B

`1.44 omega`

C

`14.4 omega`

D

`144 omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`P = (E_(v)^(2) cos phi)/(Z)`
`P = 3000 = ((240)^(2)(0.75))/(Z) d Rightarrow Z = 14.4 Omega`
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