Question # 1

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

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

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Inductor

Battery

Thermistor

Capacitor

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 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 electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

The unit of impedance is

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Farad

Henry

Tesla

Ohm

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

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 metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

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

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Once

Twice

Thrice

Four time

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

The reactance of inductor depends upon

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L

All of the above

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

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1

0

I2

Nil

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

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Resistor

Inductor

Capisitor

Transistor

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

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

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10⁶

0

10^∘

Maximum

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

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