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A choke coil is preferred to a resistanc...

A choke coil is preferred to a resistance for reducing current in an ac circuit because .

A

choke s cheap

B

there is no wastage of energy

C

current becomes wattless

D

current strength increases

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The correct Answer is:
B
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DISHA PUBLICATION-ALTERNATING CURRENT -Exercise - 1 : CONCEPT BUILDER (Topic 3 : Transformers and LC Oscillations)
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  3. Eddy currents in the core of transformer can't be developed by

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  4. A transformer is used to light a 140 W, 24 V lamp from 240 V AC mains....

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  5. A generator supplies 100 V to the primary - coil of a transformer of 5...

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  6. A transistor-oscillator using a resonant circuit with an inductor L ( ...

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  7. A capacitor in an LC oscillator has a maximum potential difference of ...

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  8. In an oscillating LC circuit with L = 50 mH and C = 4.0 mu F, the cur...

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  9. An alternating current emf device has a smaller resistance than that o...

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  10. A choke coil and capacitor are connected in series and the current thr...

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  11. In an oscillating LC circuit the maximum charge on the capacitor is Q....

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  12. If the total charge stored in the LC circuit is Q(0), then for tgt= 0

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  13. At t lt 0, the capacitor is charged and the switch is opened.At t = 0 ...

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  14. In an ideal transformer, the voltagae and the current in the primary c...

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  15. The tuning circuit of a radio receiver has a resistance of 50Omega , a...

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  16. A step-down transformer is connected to 2400 volts line and 80 amperes...

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  17. The primary winding of a transformer has 100 turns and its secondary w...

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  18. Figure shows an iron-cored transformer assumed to be 100% efficient. T...

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  19. The output of a step-down transformer is measured to be 24 V when conn...

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