1. Why do we wear footwear while handling electrical appliances?
2. What is the function of tester?
3. What is the function of indicator lamp?
4. Mention any 2 classifications of switches?
5. What is the difference b/w 1 way & 2 way switch?
6. What is HRC fuse? What is its HRC current rating?
7. What is the magnitude of supply voltage we get at home?
8. Is it single phase or three phase?
9. How to decide whether to use single phase or three phase supply?
10. What is an energy meter used for? What is the unit of electrical energy?
1. What are the various types of faults in electrical systems?
2. What protection scheme do we employ to mitigate those faults?
3. What is the expansion of MCB/ELCB?
4. What is thermal trip mechanism?
5. How does the bi-metallic strip in the MCB help break the circuit?
6. How does the solenoid coil in the MCB help break the circuit?
7. What is the approximate value of earth leakage current, overload current & short circuit current ?
8. Why MCB cannot be used for leakage current protection?
9. In which direction[ UP/DOWN ] do we s/w off an
b. Flush Type Switch
Justify your answer.
10. What is the rating of an ELCB?