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Power Electronics MCQs

Power Electronics MCQs

Power electronics is defined as the application of electronics in order to achieve control and conversion of electrical power. The history of power electronics dates back to the first high-power electronic devices made from mercury-arc valves. In today’s era, this conversion and control are performed using semiconductor devices such as thyristors, power diodes, power transistors, etc. Power conversion systems can be broadly categorized into four categories namely the rectifier, inverter, choppers, and cyclo converters.

Given below are the top 10 MCQs on Power Electronics.

Power Electronic device which performs AC to DC conversion Operation

Power Electronic device which performs AC to DC conversion Operation:

  1. Rectifier
  2. Inverter
  3. Chopper
  4. Cycloconverter

Correct answer: 1. Rectifier

Power Electronic device which performs DC to DC conversion Operation

Power Electronic device which performs AC to DC conversion Operation:

  1. Rectifier
  2. Inverter
  3. Chopper
  4. Cycloconverter

Correct answer: 2. Inverter

Power Electronic device which performs AC to AC conversion Operation

Power Electronic device which performs AC to AC conversion Operation:

  1. Rectifier
  2. Inverter
  3. Chopper
  4. Cycloconverter

Correct answer: 4. Cycloconverter

Power Electronic device which performs DC to DC conversion Operation

Power Electronic device which performs DC to DC conversion Operation:

  1. Rectifier
  2. Inverter
  3. Chopper
  4. Cycloconverter

Correct answer: 3. Chopper

Snubber circuits are used with thyristors in order to

Snubber circuits are used with thyristors in order to:

  1. Protect the gate circuit
  2. Limit the rate of rise of voltage dv/dt
  3. Limit the rate of rise of current di/dt
  4. None of these

Correct answer: 2. Limit the rate of rise of voltage dv/dt

Explanation: The dv/dt rating of thyristor implies the maximum rate of rise of anode voltage that will not trigger device without any gate signal. A snubber circuit is used in order to control this limit.

One major disadvantage of SCR being used as switch is

One major disadvantage of SCR being used as switch is:

  1. It produces harmonics
  2. It has moving parts
  3. The triggering circuit is simple
  4. It can’t be used for high-speed operations

Correct answer: 4. It can’t be used for high-speed operations

Explanation: SCR can’t be used for high-speed operations. The maximum frequency of operation for SCR is 400 Hz.

The silicon-controlled rectifier (SCR) is

The silicon-controlled rectifier (SCR) is:

  1. Unijunction device
  2. Two junction device
  3. Three junction device
  4. Four junction device

Correct answer: 3. Three junction device

Explanation: The silicon control rectifier (SCR) comprises of four layers of semiconductors, which form NPNP or PNPN structures, having three P-N junctions

The most suitable method to turn on the SCR is

The most suitable method to turn on the SCR is:

  1. dv/dt triggering Method
  2. Forward Voltage Triggering Method
  3. Gate triggering Method
  4. Temperature Triggering Method

Correct answer: 3. Gate Triggering Method

Explanation: The video below briefly explains SCR triggering methods:

All of following are current triggering semiconductor power devices except

All of following are current triggering semiconductor power devices except:

  1. GTO
  2. MOSFET
  3. Thyristor
  4. Triac

Correct answer: 2. MOSFET

Which of following is correct regarding a thyristor

Which of following is correct regarding a thyristor:

  1. Latching current > Holding Current
  2. Latching current < Holding Current
  3. Latching current = Holding Current
  4. None of these

Correct answer: 1. Latching current > Holding Current

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