Question # 1

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

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

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

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

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Voltage

Current

Charge

Botha a and b

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

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0

π

-π

π/2

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

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

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Decreased

Increased

Becomes half

Becomes 4 times

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

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

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

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

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

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

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

Choke consumes extremely small

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Current

Charge

Power

Potential

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

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