Question # 1

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

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 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

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

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Capacitors

transformer

Inductor

Generator

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

Which consumes small power.

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Inductor

Resistor

Motor

All 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 peak to peak value of alternating voltage is

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2V_o

V_o

None of these

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

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

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0

π

-π

π/2

When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.

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100 Ohm

10 Ohm

1000 Ohm

1 Ohm

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

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

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