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Electronics Mechanic Practice Test: LED Lights
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Electronics Mechanic Practice Test: LED Lights
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25 Questions

1. What is the full form of CoB?
2. What is the specification of LED light?
3. Which circuit is used to supply rated low voltage DC and protect the LED light from fluctuations?
4. How much power is consumed by a high power LED?
5. Which color is produced by the semiconductor material Aluminium Gallium Phosphide (AlGaP) in LED?
6. Incandescent lamp operates _______whereas requires _________
7. LED lamps life span and electrical efficiency, which is______than incandescent lamp.
8. How many pins does an LED have?
9. Which function is performed by the transistor in the LED light circuit?
10. Which semiconductor material is used to produce the blue color LED?
11. Why is heat sink used?
12. LED bulb specifications are-
13. LED’s main bulbs are ________.
14. What is the switching speed of LED light to reach full brightness, compared to other light sources?
15. Which of the following display panel is used to background displays?
16. Heat Sink used in LED bulb is made up of -
17. For which of the following purpose the miniature LED is extensively used?
18. Which bulb changes the color due to age and ambient temperature?
19. Which of the following material is/are used in making LED?
20. What is the name of the diode used in emergency light to prevent the reverse flow of battery charge?
21. In which of the following biasing states does the LED emits light?
22. What is the maximum power range for a standard High Power LED?
23. Which of the following segment is not an of alphanumeric display?
24. In which of the following LED's, the heat sink is used?
25. The main advantages of LED panel in lighting is ___________.

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