Protection related questions.
#1. Mho relay is normally used for the protection of……?
incorrect
#2. Reactance relays are employed for phase fault in…..?
#3. Relays performs the function of…..?
#4. A thermal protection switch provide protection against…..?
#5. Which circuit breaker works at lowest operating voltage?
#6. Buchholz relay is used on…..?
#7. which relay is used for ground fault protection?
#8. Differential relay is used for protection against….?
#9. A 2VA relay is …… sensitive than 4VArelay?
#10. An over current relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/5. the pick up value will be…..?
#11. The pick up value of a relay is 7.5A and fault current in relay coil is 30A. its plug setting multiplier is…..?
#12. Back up protection used for protection against which fault?
when primary protection fails back up protection works
#13. Most commonly used for the protection of stator winding faults of a alternator is…..?
#14. Buchholz relay is a……..actuated relay?
#15. Buchholz relay is installed between main tank and……?
#16. The ideal scheme of protection for lines is……?
#17. Which protection is used for very long high transmission lines?
#18. Differential protection of a alternator having ….. number of piolet wires?
#19. A sudden rise in voltage for a very short duration on the power system is known as…..?
#20. Which of the following is not a cause of over voltages on a power system?
#21. Transients on the power system due to current chopping are taken care of by…..?
#22. Most commonly used arrester in substation is…..?
#23. Arcing ground can be prevented by…..?
#24. The voltage rating of the transformer in a pole mounted substation is…..?
#25. Indoor substation used voltage upto…..?
#26. Outdoor substation used voltage upto…..?
#27. An indoor substation is ….. expensive than outdoor substation?
#28. The advantage of neutral earthing is…..?
#29. The size of the earth wire is determined on the basis of….?
#30. The best location for use of a booster transformer in a transmission line is…..?
#31. Earthing is necessary to give protection against….?
#32. Which circuit breaker is used for 1.5 T air conditioner?
#33. ELCB is protect circuit from….?
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