Question # 1

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

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 phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

The unit of impedance is

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Farad

Henry

Tesla

Ohm

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is.

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Maximum

Minimum

Zero

Negative

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

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Resistor

Inductor

Capisitor

Transistor

In three phase A.C. generator the phase difference between each pair of coil is.

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45^o

90^o

120^o

60^o

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

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

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Zero

1

-1

2

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

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

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

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50 Hz

60 Hz

45 Hz

70 Hz

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

Which consumes small power.

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Inductor

Resistor

Motor

All of these

The natural frequency of L.C circuit is equal to

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The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

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