Consider an NPN transistor amplifier in the common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current?
1. 1.1 mA                     

2. 1.01 mA

3. 0.01 mA                   

4. 10 mA

Subtopic:  Transistor (OLD NCERT) |
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In a common base amplifier the phase difference between the input signal voltage and the output voltage is

(1) 0                     

(2) π/4

(3)π/2                  

(4) π

Subtopic:  Transistor (OLD NCERT) |
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In NPN transistor the collector current is 10 mA. If 90% of electrons emitted reach the collector, then

(1) Emitter current will be 9 mA

(2) Emitter current will be 11.1 mA

(3) Base current will be 0.1 mA

(4) Base current will be 0.01 mA

Subtopic:  Transistor (OLD NCERT) |
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In a transistor in CE configuration, the ratio of power gain to voltage gain is 
(1) α                                     

(2) β/α 

(3) βα                                     

(4) β 

Subtopic:  Transistor (OLD NCERT) |
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Given below are symbols for some logic gates

The XOR gate and NOR gate respectively are 
(a) 1 and 2                  (b) 2 and 3
(c) 3 and 4                  (d) 1 and 4

Subtopic:  Logic gates |
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Given below are four logic gate symbol (figure). Those for OR, NOR and NAND are respectively 

(a) 1, 4, 3                     (b) 4, 1, 2
(c) 1, 3, 4                     (d) 4, 2, 1

Subtopic:  Logic gates |
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The following truth table corresponds to the logic gate

A  0  0  1  1
B  0  1  0  1
X  0  1  1  1

(1) NAND                     

(2) OR

(3) AND                       

(4) XOR

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The combination of ‘NAND’ gates shown here under (figure) are equivalent to

1. An OR gate and an AND gate respectively
2. An AND gate and a NOT gate respectively
3. An AND gate and an OR gate respectively
4. An OR gate and a NOT gate respectively.

Subtopic:  Logic gates |
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A truth table is given below. Which of the following has this type of truth table 

A  0  1  0  1
B  0  0  1  1
y  1  0  0  0

(1) XOR gate

(2) NOR gate

(3) AND gate

(4) OR gate

Subtopic:  Logic gates |
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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

(1) 0, 0

(2) 0, 1

(3) 1, 0

(4) 1, 1

Subtopic:  Logic gates |
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