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Assertion: Chock coil is the prefered ov...

Assertion: Chock coil is the prefered over a resistor to adjust current in an `AC` circuit.
Reason: Power factor for inductance is zero.

A

If both the assertion and reason are true and reason is a true explantion of the assertion.

B

If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.

C

If the assertion is true but reason false

D

If both the assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
If resistor is used in controlling `AC` supply, electrical energy will be wasted in the from of heat energy across the resistance wire. However, `AC` supply can be controlled with choke without any wastage of energy. This is because, power factor `(cos phi)` for resistance is unity and is zero for an inductance. `[P=EI cos phi]`
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A2Z-ALTERNATING CURRENT-Section B - Assertion Reasoning
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  6. Assertion: When capacitive reactance is smaler than the inductive reac...

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  7. Statement 1: An alternating current shown magnetic effect. Statemen...

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  8. Assertion: The alternating current lags behined the e.m.f. by a phase ...

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  10. Assertion: When capacitive reactance is smaler than the inductive reac...

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  11. Assertion: Chock coil is the prefered over a resistor to adjust curren...

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  12. Statement 1: An alternating current shown magnetic effect. Statemen...

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  13. Statement 1: Both dc and ac can be measured by a hot wire instrument. ...

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  14. Assertion: AC is more dangerous than DC Reason: Frequency of AC is ...

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  17. Assertion: When AC circuit contain resistor only, its power is minimum...

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