Question # 1

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

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

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0

π

-π

π/2

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

Which consumes small power.

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Inductor

Resistor

Motor

All of these

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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

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Maximum

Minimum

Zero

Infinite

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 value of capacitive reactance is given by

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Xc = VI

All of above

The natural frequency of L.C circuit is equal to

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The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

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

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

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Motor

Cell

Generator

Thermo couple

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

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

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

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Once

Twice

Thrice

Four time

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

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zero

90 ^o

180 ^o

45^o

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

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