Question # 1

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

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 condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

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

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Motor

Cell

Generator

Thermo couple

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

Choke consumes extremely small

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Current

Charge

Power

Potential

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

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

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Once

Twice

Thrice

Four time

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

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zero

90 ^o

180 ^o

45^o

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 combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

The effective value of any sinusoidal alternating current or voltage is

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None of the above

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

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

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