Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 24

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If an AC main supply is given to be $220 V$ . What would be the average emf during a positive half-cycle ?

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Important Questions on Alternating Current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 25

The hot wire ammeter measures:

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 26

Frequency of A.C. in India is,

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 27

For an alternating current

I = I_{0} \cos ω t,

What is the rms value and peak value of current :-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 28

If a step-up transformer have turn ratio

5

, frequency

50 Hz

, root-mean-square value of potential difference on primary

100 V

and the resistance of the secondary winding is

500 Ω

, then the peak value of voltage in secondary winding will be (the efficiency of the transformer is

100 %

),

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 29

A resonant AC circuit contains a capacitor of capacitance

10^{- 6} F

and an inductor of

10^{- 4} H

. The frequency of electrical oscillations will be :-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 30

A resistance of

300 Ω

and an inductance of

1 / π

henry are connected in a series to an

A C

voltage of

20 V

and

200 Hz

frequency. The phase angle between the voltage and current is

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 32

A

12 Ω

resistor and a

0.21 H

inductor are connected in series to an AC source operating at

20 V, 50 Hz

. The phase angle between the current and the source voltage is

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 33

A

110 V, 60 W

lamp is run from a

220 V AC

mains using a capacitor in series with the lamp, instead of a resistor. The voltage across the capacitor is about