Question # 1

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

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zero

90 ^o

180 ^o

45^o

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The reactance of inductor depends upon

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L

All of the above

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

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 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 main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

Impedance is denoted by:

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A

Z

P

Q

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

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0

π

-π

π/2

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

The natural frequency of L.C circuit is equal to

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If V_rms be the root mean square value of emf then its peak to peak value is given by

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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

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