Thyristors and Tranducers - General Questions Online Exam Quiz
Thyristors and Tranducers - General Questions GK Quiz. Question and Answers related to Thyristors and Tranducers - General Questions. MCQ (Multiple Choice Questions with answers about Thyristors and Tranducers - General Questions
A TRIAC:
Options
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
When checking a good SCR or TRIAC with an ohmmeter it will:
Options
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
What does a hall effect sensor sense?
Options
A : temperature
B : moisture
C : magnetic fields
D : pressure
What causes the piezoelectric effect?
Options
A : heat or dissimilar metals
B : pressure on a crystal
C : water running on iron
D : a magnetic field
A UJT has:
Options
A : two base leads
B : one emitter lead
C : two emitter leads and one base lead
D : one emitter lead and two base leads
The only way to close an SCR is with:
Options
A : a trigger input applied to the gate
B : forward breakover voltage
C : low-current dropout
D : valley voltage
What is an SCR?
Options
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
What type of application would use a photovoltaic cell?
Options
A : an automobile horn
B : a TI 92 calculator
C : a magnetic field detector
D : a remote power source
The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:
Options
A : maximum forward current
B : maximum forward gate current
C : holding current
D : reverse gate leakage current
Once a DIAC is conducting, the only way to turn it off is with:
Options
A : a positive gate voltage
B : a negative gate voltage
C : low-current dropout
D : breakover
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