Question # 1

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 Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

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=∞

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

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

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

Choke consumes extremely small

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Current

Charge

Power

Potential

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

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

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

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

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

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