Question # 1

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

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Once

Twice

Thrice

Four time

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

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50 Hz

60 Hz

45 Hz

70 Hz

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

The natural frequency of L.C circuit is equal to

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In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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

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

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Resistive

Capacitive

Inductive

Modulative

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

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 modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

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

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

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

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