Question # 1

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

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Voltage

Current

Charge

Botha a and b

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 electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

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

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10⁶

0

10^∘

Maximum

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 device which allows only the continuous flow of AC through it is.

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Inductor

Battery

Thermistor

Capacitor

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

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Small

Zero

Large

Infinite

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

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

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

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1

0

I2

Nil

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

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0

π

-π

π/2

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

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 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

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

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

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