Semiconductor Diode Quiz | Semiconductor Diode Objective Type Questions and Answers

Questions
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

Answer: 400 V
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

Answer: 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

Answer: holes, electrons
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

Answer: Forward
32 The reverse current in a diode is of the order of ……………….
A kA
B mA
C μA
D A

Answer: μA
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

Answer: 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

Answer: Less Than
35 If the temperature of a crystal diode increases, then leakage current ………..
A Remains The Same
B Decreases
C Increases
D Becomes Zero

Answer: Increases
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

Answer: Is Decreased
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

Answer: Linear
38 When the crystal current diode current is large, the bias is …………
A Forward
B Inverse
C Poor
D Reverse

Answer: Forward
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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