Question # 1

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

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

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Positive

Negative

Zero

Infinite

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

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

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Zero

1

-1

2

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

The value of capacitive reactance is given by

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Xc = VI

All of above

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

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

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10⁶

0

10^∘

Maximum

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

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

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

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 flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

Which consumes small power.

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Inductor

Resistor

Motor

All of these

The reactance of inductor depends upon

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L

All of the above

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

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