Question # 1

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

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)

The unit of impedance is

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Farad

Henry

Tesla

Ohm

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

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

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1

0

I2

Nil

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

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Once

Twice

Thrice

Four time

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 combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

The reactance of inductor depends upon

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L

All of the above

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