POWER ELECTRONICS AND DRIVES MCQ's
PART 03
1. Shown below is the diagram of an ideal super diode. When the input voltage V in is negative, then the output voltage V out = ?
a) V out/V in
b) Vin
c) 0
d) Vin * Rl
Answer: c
2. In order to reduce the reverse recovery time of the diodes, __________ is carried out.
a) shortening of the length of the device
b) platinum & gold doping
c) antimony doping
d) adding an extra silicon layer
2. In order to reduce the reverse recovery time of the diodes, __________ is carried out.
a) shortening of the length of the device
b) platinum & gold doping
c) antimony doping
d) adding an extra silicon layer
Answer: b
3. Which of the following diodes uses a metal-semiconductor junction?
a) General purpose diodes
b) Fast recovery diodes
c) Schottky diode
d) None of the mentioned
3. Which of the following diodes uses a metal-semiconductor junction?
a) General purpose diodes
b) Fast recovery diodes
c) Schottky diode
d) None of the mentioned
Answer: c
4. Which of the below mentioned statements is false regarding Schottky diodes?
a) Schottky diodes have a Al-Silicon junction
b) There is no storage of charges in a Schottky diode
c) The majority charge carriers in a Schottky diode are holes
d) Schottky diodes can be switched off faster than a p-n junction diode of the same rating
4. Which of the below mentioned statements is false regarding Schottky diodes?
a) Schottky diodes have a Al-Silicon junction
b) There is no storage of charges in a Schottky diode
c) The majority charge carriers in a Schottky diode are holes
d) Schottky diodes can be switched off faster than a p-n junction diode of the same rating
Answer: c
5. A Schottky diode _____
a) has current flow due to holes only
b) has no reverse recovery time
c) has large amount of storage charges
d) has zero cut-in voltage
5. A Schottky diode _____
a) has current flow due to holes only
b) has no reverse recovery time
c) has large amount of storage charges
d) has zero cut-in voltage
Answer: b
6. Which of the following are/is the majority charge carriers in a Schottky diode?
a) Holes
b) Electrons
c) Both holes & Electrons carry equal current
d) None of the mentioned
6. Which of the following are/is the majority charge carriers in a Schottky diode?
a) Holes
b) Electrons
c) Both holes & Electrons carry equal current
d) None of the mentioned
Answer: b
7. In a Schottky diode, the silcon is usually
a) N-type
b) P-type
c) un-doped semiconductor
d) silicon is not used
7. In a Schottky diode, the silcon is usually
a) N-type
b) P-type
c) un-doped semiconductor
d) silicon is not used
Answer: a
8. As compared to a p-n junction diode(of the same rating), a Schottky diode has ___________
a) higher cut-in voltage
b) lower reverse leakage current
c) higher operating frequency
d) higher switching time
8. As compared to a p-n junction diode(of the same rating), a Schottky diode has ___________
a) higher cut-in voltage
b) lower reverse leakage current
c) higher operating frequency
d) higher switching time
Answer: c
9. A Schottky diode has __________
a) a gate terminal
b) aluminum-silicon junction
c) platinum gold junction
d) germanium-Arsenide junction
9. A Schottky diode has __________
a) a gate terminal
b) aluminum-silicon junction
c) platinum gold junction
d) germanium-Arsenide junction
Answer: b
10. A Schottky diode can be switchd off much faster than an equivalent p-n junction diode due to its
a) higher operating frequency
b) no recombination of charges
c) more compact structure
d) None of the mentioned
Answer: b10. A Schottky diode can be switchd off much faster than an equivalent p-n junction diode due to its
a) higher operating frequency
b) no recombination of charges
c) more compact structure
d) None of the mentioned
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