Question # 1

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

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zero

90 ^o

180 ^o

45^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

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

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

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Maximum

Minimum

Zero

Infinite

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

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

Impedance is denoted by:

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A

Z

P

Q

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 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

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

The reactance of inductor depends upon

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L

All of the above

In LR circiut which one of the following statements is correct?

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L and R opposes each other

R value increases with frequency

The inductive reactance increases with frequency

The inductive reactance decreases with frequency

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

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

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Once

Twice

Thrice

Four time

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

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Motor

Cell

Generator

Thermo couple

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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