Question # 1

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

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

In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is.

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Maximum

Minimum

Zero

Negative

In three phase A.C. generator the phase difference between each pair of coil is.

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45^o

90^o

120^o

60^o

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

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

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

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

Resistance of choke is

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zero

Large

Very small

Infinite

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

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Voltage

Current

Charge

Botha a and b

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 Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

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

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Small

Zero

Large

Infinite

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

The natural frequency of L.C circuit is equal to

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The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

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

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

Choke consumes extremely small

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Current

Charge

Power

Potential

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

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