Question # 1

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

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

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Zero

1

-1

2

Electron vibrating 94,000 times each second will produce radio waves of frequency.

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94 Hz

940 HZ

94 Hz

490 Hz

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

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

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

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

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 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 internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

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

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Once

Twice

Thrice

Four time

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

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