Power Electronics Questions and Answers – Types of Diodes-2

This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Types of Power Diodes-2”.

1. Ideally the voltage drop across a conducting diode must be
a) ∞
b) 0
c) higher than the forward biased voltage
d) equal to the forward biased voltage
View Answer

Answer: b
Explanation: Ideal conduction = No losses.

2. When reverse breakdown occurs in a diode
a) voltage increases & current is constant
b) voltage increases & current also increases
c) both are constant
d) voltage is constant & current increases
View Answer

Answer: d
Explanation: Recall the I-V curve of a diode in the 3rd quadrant.

3. Schottky diodes are also called as
a) metal diode
b) hot carrier diode
c) signaling diode
d) easy turn on diode
View Answer

Answer: b
Explanation: Due to the metal used to carry the current, it is also called as a hot carrier diode.
advertisement
advertisement

4. In a Schottky diode, the aluminum metal acts as a __________
a) anode
b) cathode
c) gate
d) common terminal
View Answer

Answer: a
Explanation: The Al (Metal) always acts as the anode.

5. If the doping levels of the semiconductor is increased, then the width of the depletion layer
a) increases
b) decreases
c) is unchanged
d) keeps oscillating
View Answer

Answer: b
Explanation: Higher the doping, more the number of charge carrier available to neutralize the opposite charges on the junction.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. As compared to a p-n junction device of equal rating, the Schottky diode has
a) lower reverse voltage rating
b) lower reverse leakage current
c) higher Switching time
d) higher cut-in voltage
View Answer

Answer: a
Explanation: Low reverse voltage rating is the only drawback against a p-n junction diode.

7. In a Schottky diode, the silicon layer acts as a _____________
a) anode
b) cathode
c) gate
d) common terminal
View Answer

Answer: b
Explanation: The metal acts as the anode and the semiconductor as a cathode.
advertisement

8. In a certain power electronics application, it is required that the voltage at the load terminals is to be kept within a certain range of voltages only. Among the device listed below, which would be the most ideal choice for this application?
a) P-n junction diode
b) Schottky diode
c) Zener diode
d) Fast recover diode
View Answer

Answer: c
Explanation: Zener diode is used as a voltage regulating device.

9. Shown below is the diagram of an ideal super diode. When the input voltage Vin is positive, then the output voltage Vout = ?
The output voltage Vout is Vin When the input voltage Vin is positive
a) Vout/Vin
b) Vin
c) 0
d) Vin * Rl
View Answer

Answer: b
Explanation: Input is positive, hence it is amplified by the operational amplifier which switches the diode on. Current flows through the load & because of the feedback, the output voltage is equal to the input voltage.
advertisement

10. Zener diodes allow a current to flow in the reverse direction, when the
a) voltage reaches above a certain value
b) temperature reaches above a certain value
c) current always flows in the reverse direction only
d) current cannot flow in the reverse direction
View Answer

Answer: a
Explanation: Zener diode has voltage regulating property. When voltage reaches above a certain value (Zener voltage), current starts to flow in the reverse direction.

Sanfoundry Global Education & Learning Series – Power Electronics.

To practice all areas of Power Electronics, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.