Question # 1

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

In which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

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

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A rectifier

Detector

Oscillator

An amplifier

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

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RMS value

Instantaneous value

Valued average over a cycle

Zero

Both (B) and (C)

The RMS value of alternating current is:

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0.7 times at the peak value

0.5 times the peak value

0.7 times the Instantaneous value

Equal to maximum voltage

None of these

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

The power factor of resonant series circuit is

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1

0

-1

0.5

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

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X-rays

Ultraviolet rays

y-rays

Cosmic rays

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

A resonance curve for RLC series circuit is a plot of frequency versus

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Voltage

Current

Impedance

Reactance

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

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

Chock consumes externally small

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Charge

Current

Power

Potential

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