Question # 1

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

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0

π

-π

π/2

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

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Capacitors

transformer

Inductor

Generator

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

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

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Small

Zero

Large

Infinite

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

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

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

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

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

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

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

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

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

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

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