Question # 1

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

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

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

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

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

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

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Voltage

Current

Charge

Botha a and b

When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.

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100 Ohm

10 Ohm

1000 Ohm

1 Ohm

The value of capacitive reactance is given by

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Xc = VI

All of above

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

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

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

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Half

Two

Four times

One fourth

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

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

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Peak ot peak value

Peak value

Instantaneous value

Root mean square value

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

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