Question # 1

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

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

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

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

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Half

Two

Four times

One fourth

Which consumes small power.

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Inductor

Resistor

Motor

All of these

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

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

Impedance is denoted by:

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A

Z

P

Q

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

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

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

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

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Capacitors

transformer

Inductor

Generator

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

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

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 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

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

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