Question # 1

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

The effective value of any sinusoidal alternating current or voltage is

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None of the above

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

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

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 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

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 resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

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

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

Choke consumes extremely small

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Current

Charge

Power

Potential

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

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

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

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