To get an output Y=1 in given circuit, which

of the following input will be correct ?

      A     B      C                   A     B     C

1.  1     0       0             2.  1     0     1

3. 1      1       0             4.  0     1     0

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Symbolic representation of four logic gates

are shown as

(i) 

(ii) 

(iii) 

(iv) 

Pick out which ones are for AND, NAND and 

NOT gates, respectively.

(a) (iii), (ii)and (i)

(b) (iii), (ii) and (iv)

(c) (ii), (iv) and (iii)

(d) (ii), (iii) and (iv)

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If a small amount of antimony is added to germanium crystal

(a) the antimony becomes an acceptor atom

(b) there will be more free electrons than holes in the semiconductor

(c) its resistance is increased

(d) it becomes a p-type semiconductor

Concept Questions :-

Types of semiconductors
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In forward biasing of the p-n junction 

(a) the positive terminal of the battery is connected to n-side and the depletion region becomes thin

(b) the positive terminal of the battery is connected to n-side and the depletion region becomes thick

(c) the positive terminal of the battery is connected to p-side and the depletion region becomes thin

(d) the positive terminal of the battery is connected to p-side and the depletion region becomes thick

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A transistor is operated in common emitter configuration at VC=2 V such that a change in the base current from 100 μA to 300 μA produces a change in the collector current from 10 mA to 20 mA. The current gain is 

1. 75                                               2. 100

3. 25                                                4. 50

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In the following figure, the diodes which are forward biased, are

                                                                    

                                                                  

(1) C and D only

(2) A and C only

(3) B only

(4) Band D only

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Pure Si at 500 K has equal number of electron (ne) and hole (nh) concentrations of 1.5×1016m-3. Doping by indium increases nh to 4.5×1022 m-3. The doped semiconductor is of 

(a) n-type with electron concentration ne=5×1022 m-3

(b) p-type with electron concentration ne=2.5×1023 m-3

(c) n-type with electron concentration ne=2.5×1010 m-3

(d) p-type with electron concentration ne=5×109 m-3

Concept Questions :-

Types of semiconductors
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A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. The current through the diode is :

                      

1. 10 mA                                                    2. 15 mA

3. 20 mA                                                     4. 5 mA

 

 

Concept Questions :-

Applications of PN junction
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Which one of the following statement is false?

(a) Pure Si doped with trivalent impurities gives a p-type semiconductor 

(b) Majority carries in a n-type semiconductor are holes

(c) Minority carries in a p-type semiconductor are electrons

(d) The resistance of intrinsic semiconductor decreases with increase of temperature 

Concept Questions :-

Types of semiconductors
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The device that can act as a complete electronic circuit is

1. Junction diode

2. Integrated circuit

3. Junction transistor

4. Zener diode

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