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

1. Which electronic component is used to convert current into light, with forward biased condition?
2. What is the name of the diode used in emergency light to prevent the reverse flow of battery charge?
3. What is the range of power density of LED?
4. Which function is performed by the transistor in the LED light circuit?
5. Which IC is marked ‘x’ in LED driver circuit?
6. What is the rate of light transmission of acrylic diffuser plate?
7. Which circuit is used to supply rated low voltage DC and protect the LED light from fluctuations?
8. Which colour is produced by the semiconductor material Aluminium Gallium Phosphide (AlGaP) in LED?
9. What is the efficiency level of incandescent lamp?
10. Which bulb changes the colour due to age and ambient temperature?
11. What is the condition for glowing LED?
12. Which factor increase the performance of LED light?
13. What is the value of series resistor (Rs) connected to limit the load current to 10mA?
14. What is the purpose of 82 Ω, resistors in the circuit?
15. What is the range of rated voltage for LED?
16. What is the meaning of directional light source?
17. What is the specification of LED light?
18. What is the range of current rating for LED?
19. How to improve the lifespan of high power LEDs?
20. What is the advantage of LED?
21. How much power is consumed by a high power LED?
22. What is the switching speed of LED light to reach full brightness, compared to other light sources?
23. Which semiconductor material is used to produce the blue colour LED?
24. What is the function of the NTC component used in the LED light control?
25. What is termed as group of LEDs connected in circuits?

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