Question # 1

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

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Decreases

Increases

Does not change

Momentarily goes to zero

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

Which of the following has a great concentration of impurity

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base

emitter

collector

none of these

In frequency modulation (FM), the carrier waves amplitude

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Remains constant

Increase

Decreases

None of these

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

An A.C varies as a function of

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Current

Voltage

Time

Charge

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

Which of the following diode is used for the detection of light

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photo diode

light emitting diode

photo voltaic cell

all of them

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

Alternating current can be transmitted:

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To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

The power factor of resonant series circuit is

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1

0

-1

0.5

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

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