Question # 1

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

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

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

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

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

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

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

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zero

90 ^o

180 ^o

45^o

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

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 value of capacitive reactance is given by

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Xc = VI

All of above

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

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

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

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