Question # 1

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

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

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

In three phase A.C. generator the phase difference between each pair of coil is.

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45^o

90^o

120^o

60^o

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

The reactance of inductor depends upon

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L

All of the above

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

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Zero

1

-1

2

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

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

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