Question # 1

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

In LR circiut which one of the following statements is correct?

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L and R opposes each other

R value increases with frequency

The inductive reactance increases with frequency

The inductive reactance decreases with frequency

Resistance of choke is

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zero

Large

Very small

Infinite

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

If V_rms be the root mean square value of emf then its peak to peak value is given by

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The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

Which consumes small power.

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Inductor

Resistor

Motor

All of these

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

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 most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

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

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

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