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
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
Question 2
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
Question 3
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
Question 4
A transducer's function is to:
A. transmit electrical energy
B. convert energy
C. produce mechanical energy
D. prevent current flow
Question 5
Which is the seven-segment display?
View Answer
Question 6
A TRIAC:
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
Question 7
Which is the DIAC?
View Answer
Question 8
Which is the TRIAC?
View Answer
Question 9
What does a hall effect sensor sense?
A. temperature
B. moisture
C. magnetic fields
D. pressure
Question 10
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
Question 11
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
Question 12
The DIAC is a:
A. transistor
B. unidirectional device
C. three-layer device
D. bidirectional device
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
Question 14
What causes the piezoelectric effect?
A. heat or dissimilar metals
B. pressure on a crystal
C. water running on iron
D. a magnetic field
Question 15
The PUT (programmable unijunction transistor) is actually a type of:
A. UJT thyristor
B. FET device
C. TRIAC
D. SCR
Question 16
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
Question 17
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