Question # 1

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

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 natural frequency of L.C circuit is equal to

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High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

The value of capacitive reactance is given by

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Xc = VI

All of above

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

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

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 power factor of RL series circuit is.

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0

1

Less then 1

More than one

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 dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

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

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

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Once

Twice

Thrice

Four time

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

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

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

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

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