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Test: Types of Power Diodes


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20 Questions MCQ Test Power Electronics | Test: Types of Power Diodes

Test: Types of Power Diodes for Electrical Engineering (EE) 2023 is part of Power Electronics preparation. The Test: Types of Power Diodes questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Types of Power Diodes MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Types of Power Diodes below.
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Test: Types of Power Diodes - Question 1

Shown below is the diagram of an ideal super diode. When the input voltage Vin is negative, then the output voltage Vout = ?​

Detailed Solution for Test: Types of Power Diodes - Question 1

When the input voltage is negative, there would be a negative voltage on the diode so it works like an open circuit. Hence no current flows through the load and Vout is zero.

Test: Types of Power Diodes - Question 2

 In order to reduce the reverse recovery time of the diodes, __________ is carried out.

Detailed Solution for Test: Types of Power Diodes - Question 2

Platinum & gold doping improves the performance of the devices.

Test: Types of Power Diodes - Question 3

Which of the following diodes uses a metal-semiconductor junction?

Detailed Solution for Test: Types of Power Diodes - Question 3

Schottky diode uses a Al-Semiconductor junction.

Test: Types of Power Diodes - Question 4

Which of the below mentioned statements is false regarding Schottky diodes?

Detailed Solution for Test: Types of Power Diodes - Question 4

The majority charge carriers in a Schottky diode are electrons not holes.

Test: Types of Power Diodes - Question 5

 A Schottky diode _____

Detailed Solution for Test: Types of Power Diodes - Question 5

Due to the metal-silicon junction there are no stored charges hence, no reverse recovery time, due to which the switching is faster.

Test: Types of Power Diodes - Question 6

Which of the following are/is the majority charge carriers in a Schottky diode?

Detailed Solution for Test: Types of Power Diodes - Question 6

The metal has no holes hence major(almost full) current flows due to the electrons only.

Test: Types of Power Diodes - Question 7

In a Schottky diode, the silcon is usually

Detailed Solution for Test: Types of Power Diodes - Question 7

Usually only n-type silicon is used because the p-type has certain limitations.

Test: Types of Power Diodes - Question 8

As compared to a p-n junction diode(of the same rating), a Schottky diode has ___________

Detailed Solution for Test: Types of Power Diodes - Question 8

Due to the metal-silicon junction there are no stored charges, hence no reverse recovery time due to which the switching is faster.

Test: Types of Power Diodes - Question 9

A Schottky diode has __________

Detailed Solution for Test: Types of Power Diodes - Question 9

Schottky diode uses a Al-Semiconductor junction.

Test: Types of Power Diodes - Question 10

A Schottky diode can be switchd off much faster than an equivalent p-n junction diode due to its

Detailed Solution for Test: Types of Power Diodes - Question 10

Due to the metal-silicon junction there are no stored charges, hence no reverse recovery time due to which the switching is faster.

Test: Types of Power Diodes - Question 11

Ideally the voltage drop across a conducting diode must be

Detailed Solution for Test: Types of Power Diodes - Question 11

 Ideal conduction = No losses.

Test: Types of Power Diodes - Question 12

 When reverse breakdown occurs in a diode

Detailed Solution for Test: Types of Power Diodes - Question 12

 Recall the I-V curve of a diode in the 3rd quadrant.

Test: Types of Power Diodes - Question 13

Schottky diodes are also called as

Detailed Solution for Test: Types of Power Diodes - Question 13

Due to the metal used to carry the current, it is also called as a hot carrier diode.

Test: Types of Power Diodes - Question 14

In a Schottky diode, the aluminum metal acts as a __________

Detailed Solution for Test: Types of Power Diodes - Question 14

The Al (Metal) always acts as the anode.

Test: Types of Power Diodes - Question 15

 If the doping levels of the semiconductor is increased, then the width of the depletion layer

Detailed Solution for Test: Types of Power Diodes - Question 15

Higher the doping, more the number of charge carrier available to neutralize the opposite charges on the junction.

Test: Types of Power Diodes - Question 16

As compared to a p-n junction device of equal rating, the Schottky diode has

Detailed Solution for Test: Types of Power Diodes - Question 16

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

Test: Types of Power Diodes - Question 17

 In a Schottky diode, the silicon layer acts as a _____________

Detailed Solution for Test: Types of Power Diodes - Question 17

The metal acts as the anode and the semiconductor as a cathode.

Test: Types of Power Diodes - Question 18

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?

Detailed Solution for Test: Types of Power Diodes - Question 18

 Zener diode is used as a voltage regulating device.

Test: Types of Power Diodes - Question 19

Shown below is the diagram of an ideal super diode. When the input voltage Vin is positive, then the output voltage Vout = ?​

Detailed Solution for Test: Types of Power Diodes - Question 19

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.

Test: Types of Power Diodes - Question 20

 Zener diodes allow a current to flow in the reverse direction, when the

Detailed Solution for Test: Types of Power Diodes - Question 20

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

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