Question # 1

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 in circuit is called:

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Impedance

Inductance

Capacitance

None of above

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

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

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

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

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

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

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

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Zero

1

-1

2

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

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

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zero

90 ^o

180 ^o

45^o

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

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