Question # 1

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

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Capacitors

transformer

Inductor

Generator

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

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Small

Zero

Large

Infinite

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

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

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

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

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

The effective value of any sinusoidal alternating current or voltage is

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None of the above

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

Which consumes small power.

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Inductor

Resistor

Motor

All of these

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

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

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

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