CBSE
Multiple Choice QuestionsThe truth table given below is for (A and B are the inputs, Y is the output)
| A | B | Y |
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
NOR
AND
XOR
NAND
The truth table for the following logic circuit is
The transfer ratio B of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 2 kΩ. The peak value of the collector AC current for an AC input voltage of 0.02 V peak is
200 μA
0.01 mA
0.25 mA
500 μA
Which logic gate is represented by the following combination of logic gates?
OR
NOR
AND
NAND
A change of 8.0 mA in the emitter current brings a change of 7. 9 mA in the collector current. The value of a will be
0.96
0.93
0.90
0.99
A transistor connected at common emitter mode contains load resistance of 5 kΩ and an input resistance of 1 kΩ. If the input peak voltage is 5 mV and the current gain is 50, find the voltage gain.
250
500
125
50
The reason of current flow in p-n junction in forward bias is
drifting of charge carriers
drifting of minority charge carriers
diffussion of charge carriers
All of the above
Assertion: An n-type semiconductor has a large number of electrons but still it is electrically neutral.
Reason: An n-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following is unipolar transistor?
p-n-p transistor
n-p-n transistor
Field effect transistor
Point contact transistor
In the circuit shown in figure, when the input voltage of the base resistance is 10 V, Vb, is zero and Vce is also zero. Value of β is
133
154
196
105
