Question # 1

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

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

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1/2

sigma

Zero

sigma /4

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

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

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Once

Twice

Thrice

Four time

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 sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

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)

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

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Half

Two

Four times

One fourth

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

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

The unit of impedance is

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Farad

Henry

Tesla

Ohm

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

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

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

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

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

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