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Transformers are used...

Transformers are used

A

In DC circuits.

B

in AC circuits.

C

in both DC and AC circuits.

D

neither in DC nor in AC circuits.

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Transformer is a device based on mutual induction . When current in the primary coil continuously changes then emf is induced in the secondary coil. Alternating emf are applied to transformer .Hence option (b) is corrent.
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MODERN PUBLICATION-ALTERNATING CURRENT -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) A. (MUTIPLE CHOICE QUESTIONS)
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  2. A capacitor acts as an infinite resistance for

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  3. Transformers are used

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  4. What inductance should be connected in series with a capacitor of 20 m...

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  5. Alternating current with peak value 20sqrt(2) A is used to produce req...

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  6. Coil P is connected to a bulb and coil Q is connected to an AC source....

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  7. AC source represented as V = V(0) sin omegat is applied to a circuit a...

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  8. A constant current of magnitude sqrt(2) A is flowing through a resisto...

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  9. Select possible correct option for a circuit with net reactance zero.

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  10. Series LCR circuit is connected to an AC source of angular frequency o...

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  11. An electric bulb is rated to give correct brightness at 24 V DC. It is...

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  12. An inductor in connected to an AC source . Magnetic field energy store...

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  13. A resistance of 300 Omega is connected in series with inductor of self...

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  14. A circuit has a self inductance of 1H and carries a current of 2A. To ...

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  15. In an LCR circuit, the voltages across the components are V(L) , V(C) ...

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  16. An AC source of variable frequency f is connected to an LCR series cir...

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  17. A coil and a bulb are connected in series with a dc source, a soft iro...

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  18. A bulb and an air-cored coil are connected in series with a 20 V DC so...

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  19. Frequency of AC source is continuously increased, impedance of LCR ser...

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  20. Power factor of an ideal choke coil (i.e. R = 0) is

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