Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 20

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An AC ammeter is used to measure current in a circuit. When a given direct constant current passes through the circuit, the AC ammeter reads $3 A$ . When an alternating current passes through the circuit, the AC ammeter reads $4 A$ . Then the reading of this ammeter if DC and AC flow through the circuit simultaneously is,

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Important Questions on Alternating Current

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 21

Average power consumed in an A.C. series circuit is given by (symbols have their usual meaning);

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 22

A circuit with e.m.f.

E = 200 \sin ω t

, contains a capacitance and inductance, then the value of power factor will be-

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 23

If a chock coil of negligible resistance works on

220

V

source and

5 mA

current is flowing through it, then the loss of power in the chock coil is-

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 24

The value of current at half power point is-

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 25

Expressions for emf and current in an A.C. circuit are

E = 200 \sin 314 t volt

and

I = 100 \sin (314 t + \frac{π}{3}) amp

. The power factor is

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 26

In a series LR circuit, the voltage drop across inductor is

8

volt and across resistor is

6

volt. Then voltage applied and power factor of circuit respectively are:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 27

In an a.c. circuit the e.m.f.

(e)

and the current

(i)

at any instant are given respectively by:

e = E_{0} \sin ω t

i = I_{0} \sin (ω t - ϕ)

The average power in the circuit over one cycle of a.c. is :

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

The power factor of an AC circuit having resistance

(R)

and inductance

(L)

connected in series and an angular velocity

ω

is