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Free download in PDF Semiconductor Diode Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(21)
Mains a.c. power is converrted into d.c. power for ……………..
[A]
lighting purposes
[B]
heaters
[C]
using in electronic equipment
[D]
none of the above
Answer: using in electronic equipment
(22)
The disadvantage of a half-wave rectifier is that the……………….
[A]
components are expensive
[B]
diodes must have a higher power rating
[C]
output is difficult to filter
[D]
none of the above
Answer: output is difficult to filter
(23)
If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is ………………….
[A]
400/√2 V
[B]
400 V
[C]
400 x √2 V
[D]
none of the above
(24)
There is a need of transformer for ………………..
[A]
half-wave rectifier
[B]
centre-tap full-wave rectifier
[C]
bridge full-wave rectifier
[D]
None of the above
Answer: centre-tap full-wave rectifier
(25)
For the same secondary voltage, the output voltage from a centre-tap rectifier is ………… than that of bridge rectifier
[A]
Twice
[B]
Thrice
[C]
Four Time
[D]
One-Half
(26)
If the PIV rating of a diode is exceeded, ………………
[A]
the diode conducts poorly
[B]
the diode is destroyed
[C]
the diode behaves like a zener diode
[D]
None Of The Above
Answer: the diode is destroyed
(27)
In the p & n regions of the p-n junction the _________ & the ___________ are the majority charge carriers respectively.
[A]
holes, holes
[B]
electrons, electrons
[C]
holes, electrons
[D]
None Of The Above
(28)
When a physical contact between a p-region & n-region is established which of the following is most likely to take place?
[A]
Electrons from N-region diffuse to P-region
[B]
Holes from P-region diffuse to N-region
[C]
Both of the above mentioned statements are true
[D]
Nothing will happen
Answer: Both of the above mentioned statements are true
(29)
Which of the following is true in case of an unbiased p-n junction diode?
[A]
Diffusion does not take place
[B]
Diffusion of electrons & holes goes on infinitely
[C]
There is zero electrical potential across the junctions
[D]
Charges establish an electric field across the junctions
Answer: Charges establish an electric field across the junctions
(30)
Which of the following is true in case of a forward biased p-n junction diode?
[A]
The positive terminal of the battery sucks electrons from the p-region
[B]
The positive terminal of the battery injects electrons into the p-region
[C]
The negative terminal of the battery sucks electrons from the p-region
[D]
None Of The Above
Answer: The positive terminal of the battery sucks electrons from the p-region
31
If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ………….. biased.
[A]
Forward
[B]
Reverse
[C]
Either Forward Or Reverse
[D]
None Of The Above
32
The reverse current in a diode is of the order of ……………….
[A]
kA
[B]
mA
[C]
μA
[D]
A
33
The forward voltage drop across a silicon diode is about …………………
[A]
2.5 V
[B]
3 V
[C]
10 V
[D]
0.7 V
34
The d.c. resistance of a crystal diode is ………….. its a.c. resistance
[A]
The Same As
[B]
More Than
[C]
Less Than
[D]
None Of The Above
35
If the temperature of a crystal diode increases, then leakage current ………..
[A]
Remains The Same
[B]
Decreases
[C]
Increases
[D]
Becomes Zero
36
If the doping level of a crystal diode is increased, the breakdown voltage………….
[A]
Remains The Same
[B]
Is Increased
[C]
Is Decreased
[D]
None Of The Above
37
When the graph between current through and voltage across a device is a straight line, the device is referred to as ……………….
[A]
Linear
[B]
Active
[C]
Nonlinear
[D]
Passive
38
When the crystal current diode current is large, the bias is …………
[A]
Forward
[B]
Inverse
[C]
Poor
[D]
Reverse
39
A zener diode is destroyed if it…………..
[A]
is forward biased
[B]
is reverse biased
[C]
carrier more than rated current
[D]
none of the above
Answer: carrier more than rated current
40
A series resistance is connected in the zener circuit to………..
[A]
properly reverse bias the zener
[B]
protect the zener
[C]
properly forward bias the zener
[D]
None Of The Above
Answer: protect the zener
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