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Thyristors and Tranducers MCQ Questions & Answers

Thyristors and Tranducers MCQs : This section focuses on the "Thyristors and Tranducers". These Multiple Choice Questions (MCQs) should be practiced to improve the Thyristors and Tranducers skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

What type of application would use an injection laser diode?

A. a 10BASE-T Ethernet
B. a liquid crystal display
C. a fiber optic transmission line
D. a good flashlight

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Question 2

What causes the piezoelectric effect?

A. heat or dissimilar metals
B. pressure on a crystal
C. water running on iron
D. a magnetic field

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Question 3

What type of application would use a photovoltaic cell?

A. an automobile horn
B. a TI 92 calculator
C. a magnetic field detector
D. a remote power source

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Question 4

What is an SCR?

A. a PNPN thyristor with 3 terminals
B. a PNPN thyristor with 4 terminals
C. a PNP thyristor with 3 terminals
D. an NPN thyristor with 3 terminals

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Question 5

The DIAC is a:

A. transistor
B. unidirectional device
C. three-layer device
D. bidirectional device

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Question 6

Once a DIAC is conducting, the only way to turn it off is with:

A. a positive gate voltage
B. a negative gate voltage
C. low-current dropout
D. breakover

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Question 7


A. can trigger only on positive gate voltages
B. can trigger only on negative gate voltages
C. cannot be triggered with gate voltages
D. can be triggered by either a positive or a negative gate voltage

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Question 8

A UJT has:

A. two base leads
B. one emitter lead
C. two emitter leads and one base lead
D. one emitter lead and two base leads

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Question 9

What does a hall effect sensor sense?

A. temperature
B. moisture
C. magnetic fields
D. pressure

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Question 10

A transducer's function is to:

A. transmit electrical energy
B. convert energy
C. produce mechanical energy
D. prevent current flow

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Question 11

The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:

A. maximum forward current
B. maximum forward gate current
C. holding current
D. reverse gate leakage current

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Question 12

The PUT (programmable unijunction transistor) is actually a type of:

A. UJT thyristor
B. FET device

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Question 13

When checking a good SCR or TRIAC with an ohmmeter it will:

A. show high resistance in both directions
B. show low resistance with positive on anode and negative on cathode, and high resistance when reversed
C. show high resistance with negative on anode and positive on cathode, and low resistance when reversed
D. show low resistance in both directions

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Question 14

The only way to close an SCR is with:

A. a trigger input applied to the gate
B. forward breakover voltage
C. low-current dropout
D. valley voltage

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Question 15

Which is the DIAC?

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Question 16

Which is the seven-segment display?

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Question 17

Which is the TRIAC?

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