Thyristors and Tranducers problems
- 1. 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 Discuss
Correct Answer: low-current dropout
- 2. What does a hall effect sensor sense?
Options- A. temperature
- B. moisture
- C. magnetic fields
- D. pressure Discuss
Correct Answer: magnetic fields
- 3. 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 Discuss
Correct Answer: forward breakover voltage
- 4. 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 Discuss
Correct Answer: a remote power source
- 5. The DIAC is a:
Options- A. transistor
- B. unidirectional device
- C. three-layer device
- D. bidirectional device Discuss
Correct Answer: bidirectional device
- 6. 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 Discuss
Correct Answer: show high resistance in both directions
- 7. Which is the seven-segment display?
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 8. 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 Discuss
Correct Answer: a PNPN thyristor with 3 terminals
- 9. Which is the DIAC?
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. 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 Discuss
Correct Answer: can be triggered by either a positive or a negative gate voltage
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