MCQOPTIONS
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MCQOPTIONS
This section includes 33 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which is the seven-segment display? |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» B. [B]. | |
| 2. |
Which is the TRIAC? |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» E. | |
| 3. |
Which is the DIAC? |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» B. [B]. | |
| 4. |
The silicon-controlled rectifier (SCR) is a three-layer device consisting of a gate, an anode, and a cathode. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 5. |
A transducer does not convert energy from one form to another. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 6. |
SCRs are four-layer devices that are either fully conducting or not conducting. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 7. |
A DIAC is a bidirectional diode that has a symmetrical switching mode. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 8. |
A semiconductor using the hall effect will detect magnetic fields. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 9. |
A TRIAC will control AC voltage during the positive half cycle only. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 10. |
A TRIAC can be triggered or activated by either a positive or a negative input gate trigger. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 11. |
A silicon-controlled rectifier (SCR) has 3 terminals labeled base, collector, and emitter. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 12. |
An optically coupled isolator is a device containing _________ in a single package. |
| A. | a photodiode and an optotransmitter |
| B. | an LED and an SCR |
| C. | an anode and a cathode |
| D. | an IRED and a silicon phototransistor |
| Answer» E. | |
| 13. |
To turn an SCR off, simply remove the gate voltage. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 14. |
The gate of a TRIAC can turn it on to have current flow in either direction. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 15. |
A thermistor is a semiconductor device that acts like a piezoresistive resistor. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 16. |
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 |
| Answer» D. a good flashlight | |
| 17. |
A photodiode is a device that produces light. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 18. |
The DIAC conducts in only one direction when gated on. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 19. |
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 |
| Answer» E. | |
| 20. |
The DIAC is a: |
| A. | transistor |
| B. | unidirectional device |
| C. | three-layer device |
| D. | bidirectional device |
| Answer» E. | |
| 21. |
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 |
| Answer» D. breakover | |
| 22. |
A transducer's function is to: |
| A. | transmit electrical energy |
| B. | convert energy |
| C. | produce mechanical energy |
| D. | prevent current flow |
| Answer» C. produce mechanical energy | |
| 23. |
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 |
| Answer» B. a PNPN thyristor with 4 terminals | |
| 24. |
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 |
| Answer» C. low-current dropout | |
| 25. |
What does a hall effect sensor sense? |
| A. | temperature |
| B. | moisture |
| C. | magnetic fields |
| D. | pressure |
| Answer» D. pressure | |
| 26. |
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 |
| Answer» B. show low resistance with positive on anode and negative on cathode, and high resistance when reversed | |
| 27. |
The TRIAC is equivalent to ________________. |
| A. | a four-layer diode |
| B. | two DIACs in parallel |
| C. | a thyristor with a gate lead |
| D. | two SCRs in parallel |
| Answer» E. | |
| 28. |
The PUT (programmable unijunction transistor) is actually a type of: |
| A. | UJT thyristor |
| B. | FET device |
| C. | TRIAC |
| D. | SCR |
| Answer» B. FET device | |
| 29. |
What causes the piezoelectric effect? |
| A. | heat or dissimilar metals |
| B. | pressure on a crystal |
| C. | water running on iron |
| D. | a magnetic field |
| Answer» C. water running on iron | |
| 30. |
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 |
| Answer» E. | |
| 31. |
The optically coupled isolator interrupter module is used to transfer switching information between two electrically isolated points. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 32. |
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 |
| Answer» E. | |
| 33. |
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 |
| Answer» E. | |