Question # 1

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

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

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

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

The natural frequency of L.C circuit is equal to

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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

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

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

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

The effective value of any sinusoidal alternating current or voltage is

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None of the above

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

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

Impedance is denoted by:

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A

Z

P

Q

Choke consumes extremely small

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Current

Charge

Power

Potential

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Which consumes small power.

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Inductor

Resistor

Motor

All of these

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

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Small

Zero

Large

Infinite

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