Thyristors and Transducers Questions and Answers
Thyristors and transducers questions with answers help electronics aspirants understand key control and measurement devices used in power electronics and instrumentation. These reasoning questions for competitive exams cover SCRs, TRIACs, DIACs, phototransistors, and various transducer principles. Practicing logical reasoning questions based on these components builds clarity on signal conversion, triggering methods, and voltage control. Engineering students preparing for GATE, ISRO, BEL, or placement exams can enhance their technical reasoning and conceptual understanding with these reasoning questions and answers, ensuring they perform confidently in both objective and practical assessments.
Thyristors and Transducers
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35 questions
1. A TRIAC:
- can trigger only on positive gate voltages
- can trigger only on negative gate voltages
- cannot be triggered with gate voltages
- can be triggered by either a positive or a negative gate voltage
2. When checking a good SCR or TRIAC with an ohmmeter it will:
- show high resistance in both directions
- show low resistance with positive on anode and negative on cathode, and high resistance when reversed
- show high resistance with negative on anode and positive on cathode, and low resistance when reversed
- show low resistance in both directions
3. .What does a hall effect sensor sense?
- temperature
- moisture
- magnetic fields
- pressure
4. What causes the piezoelectric effect?
- heat or dissimilar metals
- pressure on a crystal
- water running on iron
- a magnetic field
5. A UJT has:
- two base leads
- one emitter lead
- two emitter leads and one base lead
- one emitter lead and two base leads
6. The only way to close an SCR is with:
- a trigger input applied to the gate
- forward breakover voltage
- low-current dropout
- valley voltage
7. What is an SCR?
- a PNPN thyristor with 3 terminals
- a PNPN thyristor with 4 terminals
- a PNP thyristor with 3 terminals
- an NPN thyristor with 3 terminals
8. The only way to close an SCR is with:
- a trigger input applied to the gate
- forward breakover voltage
- low-current dropout
- valley voltage
9. What type of application would use a photovoltaic cell?
- an automobile horn
- a TI 92 calculator
- a magnetic field detector
- a remote power source
10. The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:
- maximum forward current
- maximum forward gate current
- holding current
- reverse gate leakage current