Question # 1

The device which allows only the flow of D.C. is.

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Capacitors

transformer

Inductor

Generator

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

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Resistive

Capacitive

Inductive

Modulative

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

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

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

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

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0

π

-π

π/2

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

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

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

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

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