both collector and emitter are positive with respect to the base
B
collector is positive and emitter is negative with respect to the base
C
collector is positive and emitter is at same potential as the base
D
both collector and emitter are negative with respect to the base
Explanation
When the collector is positive and emitter
is negative with respect to base, it causes the forward
biasing for each junction, which causes
conduction of current.
2
AIPMT 2003
MCQ (Single Correct Answer)
Reverse bias applied to a junction diode
A
lowers the potential barrier
B
raises the potential barrier
C
increases the majority carrier current
D
increases the minority carrier current
Explanation
In reverse bias, the size of the depletion region
increases thereby increasing the potential barrier.
3
AIPMT 2002
MCQ (Single Correct Answer)
For the given circuit of p-n junction diode which is correct
A
in forward bias the voltage across R is V
B
in reverse bias the voltage across R is V
C
in forward bias the voltage across R is 2V
D
in reverse bias the voltage across R is 2V.
Explanation
In forward biasing, the resistance of p-n
junction diode is very low to the flow of current. So
practically all the voltage will be dropped across
the resistance R, i.e. voltage across R will be V.
In reverse biasing, the resistance of p-n junction
diode is very high. So the voltage drop across R is
zero.
4
AIPMT 2002
MCQ (Single Correct Answer)
In a p-n junction
A
high potential at n side and low potential at p side
B
high potential at P side and low potential at n side
C
p and n both are at same potential
D
undetermined.
Explanation
For conduction, p-n junction must be
forward biased. For this p-side should be
connected to higher potential and n-side to
lower potential.
Questions Asked from Semiconductor Electronics
On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
