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Electrical Oscillations

The power fac...

Question

The power factor of a yard choke is :

A

Nearly zero

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B

Exactly zero

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C

Nearly one

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D

Exactly one

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Solution

The correct option is C Exactly zero
Power factor
$c o s ϕ = \frac{R}{Z}$
In choke coil, $ϕ = 90^{o}$
So, $C o s ϕ = 0$

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Similar questions

"choke is used to cut currents with minimal power loss" is this statement even true? Considering the fact that when power factor is unity it has less line loss, a choke seems to only create more power loss by decreasing the power factor? Or does choke have no relation to power factor?

(A)

: Power loss in an ideal choke coil will be zero.

Reason

(R)

: Ideal choke coil has zero power factor.

39.37079

inches, shew by the theory of continued fractions that

32

metres is nearly equal to

35 y a r d s

Q. Given below are two statements.

Assertion : A choke coil is preferred over a resistor to adjust current in an AC circuit.

Reason : Power factor for inductance is zero, so, power loss is also zero for a full cycle.

Based on the above statements, choose the correct alternative.

Q. An arc lamp consumes

10 A

40 V

. If the power factor is

\frac{x}{10}

when it is connected with a suitable value of choke coil required to run the arc lamp on ac mains of

200 V

50 H z

x

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