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) |
 86%
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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) |
 84%
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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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A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

(1) Resistance of each increases

(2) Resistance of each decreases

(3) Resistance of copper increases while that of germanium decreases

(4) Resistance of copper decreases while that of germanium increases

Subtopic:  Types of Semiconductors |
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