When a p-n junction is forward biased:

1.  Depletion region becomes thick

2.  p-side is at a higher potential than n side

3.  Current flowing is zero

4.  Effective resistance is of the order of 106W

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When a transistor is used as a switch it is in:

1.  Active state

2.  Cut off state

3.  Saturation state

4.  Both cut off state and saturation state are possible

Concept Questions :-

Applications of Transistor
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Use of transistor as an amplifier works in the region -

1.  Cut off region

2.  Saturation region

3.  Passive region

4.  Active region

Concept Questions :-

Applications of Transistor
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Which of the following is correct for n-type semiconductor?

1.  Electron is majority carriers and trivalent atoms are dopants.

2.  Electrons are majority carriers and pentavalent atoms are dopants.

3.  Holes are majority carriers and pentavalent atoms are dopants.

4.  Holes are majority carriers and trivalent atoms are dopants.

Concept Questions :-

Applications of PN junction
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If α be the current gain of a transistor in common base mode and β be the current gain incommon emitter mode then-

1.  α < 1 

2.  β > 1 

3.  α = β1 + β

4.  All of these

 

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For a transistor amplifier, the power gain and voltage gain are 150 and 10 respectively. The current gain is-

1.  110 

2.  115

3.  15

4.  1500

 

 

Concept Questions :-

Applications of Transistor
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In semiconductors, which of the following gives the law of mass action (where symbols have their usual meanings)-

1.  n1 = ne = nh  

2.  ni2 = nenh  

3.  nh >> ne  

4.  nh << ne

 

Concept Questions :-

Types of semiconductors
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The conductivity of an n-type semiconductor whose density of conduction electrons is ne, Density of holes is nh, Mobility of conduction electrons is m and Mobility of holes is mh, will be

1.  enemh + neme 

2.  eneme + nhme  

3.  eneme + mh  

4.  eneme + nhmh 

Concept Questions :-

Types of semiconductors
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When the temperature of the silicon sample is increased from 27° C to 100° C, the conductivity of silicon will be

1.  Increased

2.  Decreased

3.  Remain same

4.  Zero

 

Concept Questions :-

Types of semiconductors
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The output Y of the logic gate circuit shown in figure is best represented as

(1) A+(A.B)

(2) A+(A+B)

(3) A+(A.B)

(4) A+(A.B)

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