Power Electronics combines the solid-state electronic components with control and power systems so as to control the electric power systems, drives, and industrial controls. While modern switchyards and substations heavily rely on power electronics, it is crucial to develop a clear image of the entire subject. In this regard, Electrical Engineering XYZ shares power electronics MCQs which are important for electrical jobs, competitive tests, university exams.
Contents
- 1 The device which performs dc-dc conversion
- 2 The DIAC is a
- 3 The TRIAC is
- 4 A thyristor has
- 5 The SCS has
- 6 Forced commutation on SCS can be achieved by
- 7 The correct statement about SCR
- 8 PUT stands for
- 9 A DIAC conducts current in
- 10 The LASCR is
- 11 Sort the correct statement about DIAC and TRIAC
- 12 Which one the following is not a thyristor
- 13 The device which performs dc-ac conversion
- 14 The SCS is a _____ terminal thyristor that has _____ gate terminals
- 15 The SCS is turned on by
- 16 UJT has ______ pn junction/junctions
- 17 Which one of the following is not a thyristor
- 18 LASCR is a
- 19 The device that has no gate terminal
- 20 The method which can be used to latch Shockley diode
The device which performs dc-dc conversion
The device which performs dc-dc conversion:
- Inverter
- Rectifier
- Chopper
- Switch
Correct answer: 3. Chopper
Explanation: Chopper is an electrical device which converts dc to dc conversion.
- Inverter: An inverter is a power electronics device that converts DC (Direct Current) to AC (Alternating Current). It is commonly used in applications where AC power is required, such as in homes and electrical grids.
- Rectifier: The rectifier is also a power electronic device that performs conversion between AC to DC. It is often used in applications where DC power is needed, such as in electronic devices and power supplies.
- Chopper: A chopper is a device that performs DC-DC conversion. It is used to convert one DC voltage level to another DC voltage level. Choppers use semiconductor switches (typically MOSFETs or IGBTs) to control the flow of current and voltage in order to regulate and modify the DC output. Choppers are commonly used in applications like electric vehicles, renewable energy systems, and adjustable-speed drives.
- Switch: A switch is a generic term used to describe a device or component that can control the flow of electric current. It can be used in various contexts, including both AC and DC circuits. While a switch can be part of a chopper circuit, it does not necessarily refer specifically to a device that performs DC-DC conversion on its own.
Hence 3. Chopper is correct answer.
The DIAC is a
The DIAC is a:
- One terminal device
- Two terminal device
- Three-terminal device
- Four terminal device
Correct answer: 2. Two terminal device
The TRIAC is
The TRIAC is:
- An SCR
- Made up of three DIAC’s
- Is alike a bi-directional SCR
- None of these
Correct answer: 3. Is alike a bi-directional SCR
The structure of TRIAC matches two SCR’s which are joined back to back in a parallel fashion. Thus we can relate a TRIAC with a bi-directional SCR.
A thyristor has
A thyristor has:
- One pn junction
- Two pn junctions
- Three pn junctions
- Four pn junctions
Correct answer: 3. Three pn junctions
Explanation: A thyristor is a semiconductor device commonly used in power control applications. It is a four-layer, three-terminal device that acts as a switch, allowing current to flow in one direction when triggered. The two main types of thyristors are silicon-controlled rectifiers (SCRs) and triacs.
The SCS has
The SCS has:
- Single gate terminal
- Two gate terminals
- Three gate terminals
- Four gate terminals
Correct answer: 3. Two gate terminals
Forced commutation on SCS can be achieved by
Forced commutation on SCS can be achieved by:
- Shorting anode and cathode terminals
- By Applying a negative voltage between anode and cathode
- Both of these
- None of these
Correct answer: 3. Both of these
The correct statement about SCR
The correct statement about SCR:
- SCR is not a rectifier
- A single SCR can’t be used in full ac control
- SCR is not used commonly because it is very expensive
- GTO is a variant of SCR
Correct answer: 3. A single SCR can’t be used in full ac control
PUT stands for
PUT stands for:
- Programmable Unijunction Transistor
- Positive Unijunction Transistor
- Photoconductive Unijunction Transistor
- Pi Unijunction Transistor
Correct answer: 1. Programmable Unijunction Transistor
A DIAC conducts current in
A DIAC conducts current in:
- One direction
- Two directions
Correct answer: 2. Two directions
The LASCR is
The LASCR is:
- A laser activated SCR
- A light-activated SCR
- Lithium anode SCR
- None of these
Correct answer: 2. A light-activated SCR
Sort the correct statement about DIAC and TRIAC
Sort the correct statement about DIAC and TRIAC:
- Both are bilateral devices
- TRIAC is bilateral, but DIAC is unilateral
- DIAC is bilateral, but TRIAC is unilateral
- Both are unilateral devices
Correct answer: 1. Both are bilateral devices
Which one the following is not a thyristor
Which one the following is not a thyristor:
- SCS
- UJT
- DIAC
- TRIAC
Correct answer: 2. UJT
The device which performs dc-ac conversion
The device which performs dc-ac conversion:
- Inverter
- Rectifier
- Chopper
- Switch
Correct answer: 1. Inverter
The SCS is a _____ terminal thyristor that has _____ gate terminals
The SCS is a _____ terminal thyristor that has _____ gate terminals.
- Two, two
- Two, four
- Four, two
- Four, one
Correct answer: 3. Four, two
The SCS is turned on by
The SCS is turned on by:
- Applying a negative pulse on anode gate
- Applying a positive pulse on anode gate
- Applying a negative pulse on cathode gate
- None of these
Correct answer: 1. Applying a negative pulse on anode gate
UJT has ______ pn junction/junctions
UJT has ______ pn junction/junctions:
- Single
- Two
- Three
- Four
Correct answer: 1. Single
Which one of the following is not a thyristor
Which one of the following is not a thyristor:
- PUT
- UJT
- SCS
- DIAC
Correct answer: 2. UJT
LASCR is a
LASCR is a:
- Rectifier
- Thyristor
- Both of these
- None of these
Correct answer: 3. Both of these
The device that has no gate terminal
______ has/have no gate terminal:
- DIAC
- TRIAC
- Both of these
- None of these
Correct answer: 1. Diac
Explanation: The DIAC has no gate terminal
- Diac: A diac is a two-terminal semiconductor device that is used to trigger and control the conduction of alternating current (AC). It is a bidirectional device, meaning it can conduct current in both directions. The diac does not have a gate terminal. It is typically used in power electronics applications such as triggering triacs and controlling dimmer circuits.
- Triac: A triac is a three-terminal semiconductor device that is also used for controlling AC power. It is similar to a thyristor but can conduct current in both directions. The triac has three terminals: an MT1 (main terminal 1), an MT2 (main terminal 2), and a gate terminal. The gate terminal is used to control the triggering of the device.
The method which can be used to latch Shockley diode
The method which can be used to latch Shockley diode:
- Exceed the critical rate of voltage rise from anode to cathode
- Exceed the breakover voltage from anode to cathode
- Both of these
- None of these
Correct answer: 3. Both of these
Continue Studying:
- Power Electronics MCQs Part 1
- Power Electronics MCQs Part 2
- Power Electronics MCQs Part 3
- Power Electronics MCQs Part 4
- Power Electronics MCQs Part 5
- Power Electronics MCQs Part 6
- Power Electronics MCQs Part 7
- Power Electronics MCQs Part 8
- Power Electronics MCQs Part 9
- Power Electronics MCQs Part 10
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