Question # 1

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

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

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

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

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 peak to peak value of alternating voltage is

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2V_o

V_o

None of these

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

At high frequency the value of reactance of capacitor will be.

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Small

Zero

Large

Infinite

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

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

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

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

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