Question # 1

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

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

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10⁶

0

10^∘

Maximum

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

The reactance of inductor depends upon

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L

All of the above

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

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0

π

-π

π/2

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

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50 Hz

60 Hz

45 Hz

70 Hz

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

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

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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 internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

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

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

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