Thyristors Questions and Answers
Thyristors are semiconductor devices widely used for controlling high-power electrical applications such as rectifiers, converters, and AC regulators. Understanding thyristor operation and characteristics is vital for candidates appearing in GATE, DRDO, and JE-level electrical exams. Our set of Thyristors questions with answers provides detailed aptitude questions and answers to help you master triggering methods, turn-off techniques, and VI characteristics. Designed for aptitude test practice online, this content enables students to strengthen their conceptual clarity and score high in technical competitive exams and interviews.
Thyristors
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24 questions
1. The ________ can be externally programmed to turn on at a desired anode-to-gate voltage level.
- UJT
- PUT
- SCR
- SCS
2. You need a very efficient thyristor to control the speed of an AC fan motor. A good device to use would be
- a 4-layer diode.
- a PUT.
- a triac.
- a BJT.
3. An application of a(n) ________ is in a lighting system for power interruptions.
- SCR
- SCS
- diac
- triac
4. The silicon-controlled switch (SCS) is similar in construction to the
- triac.
- diac.
- SCR.
- 4-layer diode.
5. The ________ can conduct current in either direction and is turned on when a breakover voltage is exceeded.
- SCR
- diac
- SCS
- triac
6. You need to design a relaxation oscillator circuit. The most likely device to use might be
- an SCR.
- a UJT.
- a triac.
- a 4-layer diode.
7. You have the schematic diagram of several types of circuits. Which of these circuits most likely uses a triac?
- an oscillator
- an ac motor control
- a programmable oscillator
- an amplifier
8. The ________ is like a diac with a gate terminal.
- triac
- SCR
- SCS
- none of the above
9. You have a need to use a device to trigger an SCR. A good one to use might be
- an SCS.
- a UJT.
- a 4-layer diode.
- a PUT.
10. The SCR can be triggered on by a pulse at the
- gate.
- anode.
- cathode.
- none of the above