Question # 1

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

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

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

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

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

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50 Hz

60 Hz

45 Hz

70 Hz

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

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Once

Twice

Thrice

Four time

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

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

An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

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

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Positive

Negative

Zero

Infinite

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

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

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

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Resistor only

Capacitor only

Inductor only

All of these

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

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

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

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