Question # 1

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

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Conductor

Amplifier

Oscillator

Rectifier

For full wave rectification, the minimum number of diodes used is:

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1

2

3

4

The power output of a full wave rectifier is:

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Equal to H.W.R

Twice of H.W.R

Half of H.W.R

Four times of H.W.R

The method by which only one half of A.C cycle is converted into direct current is called

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half wave amplification

half wave rectification

Full wave rectification

full wave amplification

A certain noninverting amplifier has R1 of 1 kΩ and R2 of 100 kΩ. The closed-loop voltage gain is ………

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100,000

100

1000

101

The efficiency of full wave rectifier is:

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25.6%

81.2%

81.6%

71.2%

A pure semiconductor has:

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An infinite resistance at 0^oC)

A finite resistance which does not depend upon temperature

A finite resistance which decreases with temperature

A finite resistance which increase with temperature

Inverting amplifier circuits have

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A very high input impendance

A very low input impendance

A low output impendance

Both A and C

The diodes works on

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A.C

D.C

both A and B

None of these

The diode charactristics curve is plot between

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I & t

V& t

V& I

None

A circuit that converts Pulsating DC into smooth DC contain :

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Filter

Capacitor

Inductor

LC circuit

A diode characteristics curve is a graph plotted between;

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse current

In a full wave rectifier:

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DC current is twice that of half wave rectifier

DC pulses are twice per cycle that of half wave rectifier

DC voltage is twice that of half wave rectifier

All are correct

The efficiency of half wave rectifier is:

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25.6%

1.2%

40.6%

66.6%

A non-conducting semiconductor diode is:

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Forward biased

Poorly biased

Reverse biased

None of them

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