Question # 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 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

The unit of impedance is

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Farad

Henry

Tesla

Ohm

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

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

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

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

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10⁶

0

10^∘

Maximum

Impedance is denoted by:

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A

Z

P

Q

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)

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

Choke consumes extremely small

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Current

Charge

Power

Potential

Which consumes small power.

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Inductor

Resistor

Motor

All of these

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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