40 TOP THYRISTORS and TRANDUCERS Online Test – Questions and Answers 1. What does a hall effect sensor sense? magnetic fields temperature moisture pressure 2. A transducer’s function is to: convert energy transmit electrical energy produce mechanical energy prevent current flow 3. What type of application would use an injection laser diode? a 10BASE-T Ethernet a fiber optic transmission line a liquid crystal display a good flashlight 4. The only way to close an SCR is with: forward breakover voltage a trigger input applied to the gate low-current dropout valley voltage 5. The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the: maximum forward gate current reverse gate leakage current maximum forward current holding current 6. What causes the piezoelectric effect? a magnetic field water running on iron pressure on a crystal heat or dissimilar metals 7. A UJT has: two base leads one emitter lead two emitter leads and one base lead one emitter lead and two base leads 8. A TRIAC: can trigger only on negative gate voltages can be triggered by either a positive or a negative gate voltage can trigger only on positive gate voltages cannot be triggered with gate voltages 9. What is an SCR? a PNP thyristor with 3 terminals a PNPN thyristor with 4 terminals a PNPN thyristor with 3 terminals an NPN thyristor with 3 terminals 10. When checking a good SCR or TRIAC with an ohmmeter it will: show low resistance in both directions 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 Loading … Question 1 of 10
