Question # 1

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

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Maximum

Minimum

Zero

Infinite

The natural frequency of L.C circuit is equal to

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A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

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

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Resistor

Inductor

Capisitor

Transistor

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

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

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

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 main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

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

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

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

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

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10⁶

0

10^∘

Maximum

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

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

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

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Once

Twice

Thrice

Four time

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

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

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

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