Question # 1

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 value of capacitive reactance is given by

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Xc = VI

All of above

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

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

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Zero

1

-1

2

Resistance of choke is

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zero

Large

Very small

Infinite

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

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

If V_rms be the root mean square value of emf then its peak to peak value is given by

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

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Resistor only

Capacitor only

Inductor only

All of these

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

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

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

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1/2

sigma

Zero

sigma /4

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

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0

π

-π

π/2

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

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=∞

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

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Positive

Negative

Zero

Infinite

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