In the given circuit power developed in 1 resistor is

     

1.  36 mW

2.  12 mW

3.  144 mW

4.  64 mW

 

Concept Questions :-

Applications of PN junction
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A semiconductor is known to have an electron concentration of 8 x 1013 cm-3 and hole concentration of 5 x 1012 cm-3. The semiconductor is

1.  N-type

2.  P-type

3.  intrinsic

4.  insulator

Concept Questions :-

Types of semiconductors
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In a common-emitter transistor, the phase difference between input and output is:

1.  Zero

2.  π/2

3.  π/3

4.  π

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The current through an ideal p-n junction diode shown in the circuit will be -

                                       

1.  5 A

2.  0.2 A 

3.  0.6 A

4.  Zero

Concept Questions :-

Applications of PN junction
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A transistor is used in common emitter mode in an amplifier circuit. When a signal of 10 mV is added to the base-emitter voltage, the base current changes by 15 μA and the collector current changes by 1.5 mA. The current gain b will be

1.  50

2.  48

3.  100

4.  200

Concept Questions :-

Applications of Transistor
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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)

Concept Questions :-

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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 conductivity of an n-type semiconductor whose density of conduction electrons is ne, Density of holes is nh, Mobility of conduction electrons is meand 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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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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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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