Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 49

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A resistor $R$ , an inductor $L$ , a capacitor $C$ and voltmeters $V_{1}, V_{2} and V_{3}$ are connected to an oscillator in the circuit as shown in the adjoining diagram. When the frequency of the oscillator is increased up to resonance frequency, the voltmeter reading (at resonance frequency) is zero in the case of,

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Important Questions on Alternating Current

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 50

In the series $LCR$ circuit as shown in figure, the voltmeter and ammeter readings are,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 51

A power transformer (step up) with an

1 : 8

turn ratio has

60 Hz, 120 V

across the primary. The load in the secondary is

10^{4} Ω

. The current in the secondary is,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 52

A transformer is used to light a

140 watt, 24 volt

lamp from

240 V

AC mains. The current in the main cable is

0.7 amp

. The efficiency of the transformer is,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 53

In a step-up transformer, the voltage in the primary is

220 V

and the current is

5 A

. The secondary voltage is found to be

22000 V

. The current in the secondary (neglect losses) is,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 54

The core of a transformer is laminated to reduce,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 55

A capacitor is a perfect insulator for,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 56

A choke coil should have,

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Alpha Question Bank for Engineering: Physics>Chapter 28 - Alternating Current>Exercise - 1>Q 57

With increase in frequency of an AC supply, the inductive reactance,