In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is

1. 36                       2. 26
3. 16                       4. 6

Subtopic:  Transistor (OLD NCERT) |
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If α = 0.98 and current through emitter ie = 20 mA, the value of β is 
(a) 4.9                  (b) 49
(c) 96                   (d) 9.6

Subtopic:  Transistor (OLD NCERT) |
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In an NPN transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, the emitter current (iE) and base current (iB) are given by 
(1) iE = –1 mA, iB = 9 mA
(2) iE = 9 mA, iB = – 1 mA
(3) iE = 1 mA, iB = 11 mA
(4) iE = 11 mA, iB = 1 mA

Subtopic:  Transistor (OLD NCERT) |
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Least doped region in a transistor 

(1) Either emitter or collector

(2) Base

(3) Emitter

(4) Collector

Subtopic:  Transistor (OLD NCERT) |
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The transistors provide good power amplification when they are used in 

(1) Common collector configuration

(2) Common emitter configuration

(3) Common base configuration

(4) None of these

Subtopic:  Applications of Transistor (OLD NCERT) |
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The transfer ratio of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 kΩ. The peak value for an A.C input voltage of 0.01 V peak is:

1. 100 μA

2. 0.01 mA

3. 0.25 mA

4. 500 μA

Subtopic:  Applications of Transistor (OLD NCERT) |
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A common emitter amplifier is designed with NPN transistor (α = 0.99). The input impedance is 1 KΩ and load is 10 KΩ. The voltage gain will be 

(1) 9.9                           

(2) 99
(3) 990                         

(4) 9900

Subtopic:  Applications of Transistor (OLD NCERT) |
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For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1, C = 0 then the logic states of output D are

(a) 0, 0
(b) 0, 1
(c) 1, 0
(d) 1, 1

Subtopic:  Logic gates |
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Bonding in a germanium crystal (semi- conductor) is

(1) Metallic                         

(2) Ionic
(3) Vander Waal's type         

(4) Covalent

Subtopic:  Types of Semiconductors |
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In a semiconductor, the concentration of electrons is 8×1014 cm3 and that of the holes is 5×1012 cm3. The semiconductor is

(1) P-type                   

(2) N-type
(3) Intrinsic                 

(4) PNP-type

Subtopic:  Types of Semiconductors |
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