Question # 1

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

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

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Capacitors

transformer

Inductor

Generator

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

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

Which consumes small power.

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Inductor

Resistor

Motor

All of these

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

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

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

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 frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

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

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