In a common emitter transistor amplifier, the audio signal voltage across resistance of 1 kΩ is 2V. If the base resistance is 200Ω and the current amplification factor is 50, the input signal voltage will be

(1) 4 mV

(2) 8 mV

(3) 16 mV

(4) 32 mV

 

Subtopic:  Transistor (OLD NCERT) |
 69%
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If α be the current gain of a transistor in common base mode and β be the current gain in
common emitter mode then-

1.  α < 1 

2.  β > 1 

3.  α = β1 + β

4.  All of these

 

Subtopic:  Transistor (OLD NCERT) |
 74%
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In semiconductors, which of the following gives the law of mass action?
(where symbols have their usual meanings.)
1. \(n_i=n_e=n_h\)
2. \(n_i^2=n_en_h\)
3. \(n_h>> n_e\)
4. \(n_h<<n_e\)

Subtopic:  Types of Semiconductors |
 83%
From NCERT
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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 

Subtopic:  Types of Semiconductors |
 66%
From NCERT
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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

Subtopic:  PN junction |
 60%
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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

Subtopic:  Transistor (OLD NCERT) |
 58%
From NCERT
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In the given circuit power 
developed in 1 resistor is

     

1.  36 mW

2.  12 mW

3.  144 mW

4.  64 mW

 

Subtopic:  Applications of PN junction |
 65%
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A semiconductor is known to have an electron concentration of 8×1013 cm-3 and a hole concentration of 5×102 cm-3. The semiconductor is:

1.  n-type

2.  p-type

3.  intrinsic

4.  insulator

Subtopic:  Types of Semiconductors |
 87%
From NCERT
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The given electrical network is equivalent to 

1. AND gate 

2. OR gate

3. NOR gate

4. NOT gate 

 

Subtopic:  Logic gates |
 66%
From NCERT
NEET - 2017
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In a common-emitter transistor amplifier, the audio signal voltage across the collector is 3 V. The resistance of the collector is 3 kΩ. If the current gain is 100 and the base resistance is 2 kΩ, the voltage and power gain of the amplifier are:

1. 200 and 1000

2. 15 and 200

3. 150 and 15000

4. 20 and 2000

Subtopic:  Applications of Transistor (OLD NCERT) |
 77%
From NCERT
NEET - 2017
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