Question # 1

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

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Zero

1

-1

2

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

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

The natural frequency of L.C circuit is equal to

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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

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

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

Which consumes small power.

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Inductor

Resistor

Motor

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

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

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