Question # 1

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

Resistance of choke is

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zero

Large

Very small

Infinite

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

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

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

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

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

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The effective value of any sinusoidal alternating current or voltage is

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None of the above

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

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

Choke consumes extremely small

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Current

Charge

Power

Potential

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

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

Which consumes small power.

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Inductor

Resistor

Motor

All of these

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 of inductor depends upon

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L

All of the above

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

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