Question # 1

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

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

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Half

Two

Four times

One fourth

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

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 three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.

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100 Ohm

10 Ohm

1000 Ohm

1 Ohm

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

The natural frequency of L.C circuit is equal to

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A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

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

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Peak ot peak value

Peak value

Instantaneous value

Root mean square value

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

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

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

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

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1/2

sigma

Zero

sigma /4

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

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