Question

The coefficient of induction of a choke coil is 0.1 H and resistance is 12 Ω. If it is connected to an a.c source of frequency 60Hz. Then the power factor will be ______.

पर्याय

• 0.35

• 0.30

• 0.28

• 0.24

Answer 1

The coefficient of induction of a choke coil is 0.1 H and resistance is 12 Ω. If it is connected to an a.c source of frequency 60Hz. Then the power factor will be 0.30.

Explanation:

As we know,

`cos phi = "R"/"Z" = "R"/(sqrt("R"^2 + omega^2"L"^2))`

`= 12/(sqrt((12)^2 + 4 xx pi^2 xx (60)^ xx (0.1)^2))`

cos Φ = 0.30