Power Electronics MCQs Part 1

Power Electronics MCQs Part 1

In case of an ideal power diode, the leakage current flows from

In case of an ideal power diode, the leakage current flows from

1. Anode to cathode
2. Cathode to anode
3. Both of above
4. None of these

Correct answer: 4. None of these

Explanation: In case of ideal power diode, the Leakage current does not flow.

The thyristor can be also called as

The thyristor can be also called as

1. AC Switch
2. DC Switch
3. Both of these
4. None of these

Correct answer: 2. DC Switch

Explanation: A thyristor is a unidirectional device and it conducts current in one direction only. However, unlike a diode, the thyristor can operate as either an open circuit switch or as a rectifying diode depending on way the thyristor gate is triggered. In simple words thyristors can operate in the switching mode and can be thought as DC Switch.

Which of following is type of power transistor

Which of following is type of power transistor:

1. BJTs
2. MOSFETs
3. IGBTs
4. All of these

Correct answer: 4. All of these

SCRs are used in series to meet

SCRs are used in series to meet

1. Low current demand
2. Low voltage demand
3. High current demand
4. High voltage demand

Correct answer: 4. High voltage demand

Leakage current flows through the thyristor during

Leakage current flows through the thyristor during:

1. Forward blocking mode
2. Reverse blocking mode
3. Both of above
4. None of these

Correct answer: 3. Both of above

Explanation:

In forward blocking mode junction J₂ and in reverse blocking mode junction J₁ and J₃ act as a capacitor hence leakage current present in both mode.