Question # 1

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The unit of impedance is

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Farad

Henry

Tesla

Ohm

The reactance of inductor depends upon

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L

All of the above

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

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

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

The effective value of any sinusoidal alternating current or voltage is

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None of the above

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

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

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

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Once

Twice

Thrice

Four time

If V_rms be the root mean square value of emf then its peak to peak value is given by

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

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zero

90 ^o

180 ^o

45^o

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

The highest value reached by the voltage or current in one cycle is called.

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Peak ot peak value

Peak value

Instantaneous value

Root mean square value

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

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

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10⁶

0

10^∘

Maximum

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