Question # 1

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

At high frequency the value of reactance of capacitor will be.

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Small

Zero

Large

Infinite

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

Impedance is denoted by:

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A

Z

P

Q

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