• What is the function of an isolator?
- 16 Answers
- 129342 Views
- L&T, NTPC, I also Faced
- E-Mail Answers
Answer Posted / thabani chinhara
In power systems an isolator is a switch which is used to
completely open a circuit which has been rendered dead by
means of opening a circuit breaker for maintenance of
equipment. It can be visually seen that an isolator is open
and hence service men are assured that it is safe to work
on the isolated equipment. The equipment to be worked on is
further earthed mostly on either side so that electrical
energy that could be in the equipment is completely
discharged to earth further enhancing safety of the service
men. An isolator is also used for sectionalising power
lines during fault location. An isolator, unlike an auto
disconnector is not used to break load or close a loaded
circuit. An auto disconnector opens and closes a circuit
with limited load. Isolators are used at homes to isolalate
appliances with circuit breakers that are out of sight of
the service men in charge of repairing the appliances.
These isolators are therefore installed near the
appliances such as air conditioners.
| Is This Answer Correct ? | 42 Yes | 11 No |
Post New Answer View All Answers
How do you calculate the area under the stress-strain curve?
hi guys ,pls help me......i urgently need previous year question paper for preparation of HPCL (MECHANICAL).pls email me @ mangal_2911@yahoo.co.in
1. What are good characteristics of good combustion in a boiler? 2. What do you analyze from boiler water analysis? 3. What do you treat in high alkalinity of boiler water? 4. What is a feed water pump? Dearator feed heater? 5. What is the purpose of the nozzle of impulse turbine? 6. What are the things needed to have an efficient boiler burning? 7. Name Of Parts And Each Purpose 8. What are the causes of emergency stop in a steam engine? 9. What is the normal vacuum pressure in a steam turbine atmospheric condenser? What would cause the press to falls? 10. Steam turbine (function an parts) 11. What is the boiling point of water? 12. What are the safety devices of boiler? 13. What is the effect of high alkaline water to a boiler? 14. Steps In starting boilers. 15. Small gear found in the steam turbine. 16. What is an Economizer? 17. What are the methods of heat transfer? 18. Types of pressure 19. What are the different parts of impulse reaction turbine? 20. What is the color of the flame of the boiler running in good condition? 21. What type of pump is commonly used is feed water system in auxiliary boiler? 22. What is the specific heat of water? 23. What do you do to prevent flare black? 24. What is a brake horsepower? 25. What is the purpose of a de-superheater? 26. What is the purpose of corrugated furnaces? 27. What are the causes of steam turbine failure? 28. What is the purpose of superheater? 29. Given a cutaway isometric view of the steam turbine. Examinee was asked to identify the following Parts: 30. What is thrust bearing? 31. Give five boiler mounting valves. 32. In steam boiler, what are the various test in water boiler? 33. How much calorific value of heat is needed to heat 00c of 34. What will happen if boiler backfires? 35. What is the color of flame if the boiler is running in good condition? How about when it is not in good condition? 36. How does the steam work in a steam turbine? 37. What are the causes of boiler backfire and steps in how to prevent it from happening? 38. What are the causes of high alkalinity in boiler water? 39. What are sensible heat, latent heat, and specific heat of water? 40. What are the causes of turbine vibration 41. Identify the parts of steam turbine 42. What is the normal Ph value of boiler water 43. Causes of dilution of lubricating oil in a steam turbine? 44. Explain briefly- good combustion of auxiliary boiler? 45. Method of testing or checking boiler water? 46. What is mean carry over of Aux. Boiler? 47. What are steam turbine parts usually come into damage? 48. Why must we pay attention when we drain steam in steam turbine. What factors are observed? 49. What type of pump use in boiler F.O. system? 50. What parameters to be reported when we send lubricating oil for shore analysis? 51. In boiler, what does steam and smoke goes out to the funnel. What reason? 52. Where can you find the feed check valve and feed stop valve and give the purpose of it? 53. What are the causes of troubles in boiler during operations? 54. Give the purpose of nozzle in impulse turbine? 55. What s gland sealing steam? 56. How to prevent back fire of boiler? 57. What is the used of economizer in boiler? 58. What is the seal packing gland for turbine? 59. What is the flow of steam in an impulse turbine? 60. What will happen if you blow the soot in the boiler? 61. State the purpose of air heater? 62. How to operate soot blower boiler and economizer? 63. What do you mean by A.CC.? 64. What is the thermal efficiency of a diesel engine? 65. What is a blow down valves?
What is a diaphragm?
What is the purpose of bilge separator
How will you classify sliding contact?
Under what circumstances would there be an increase in pressure in a diver¬gent nozzle ?
What are whiskers ?
can a deareator be placed at any height with care that suction (NPSH) for feed pump is satisfied
in a pump, impeller wear ring is harder or casing ring? why?
what is the meaning of MIN MAX?
Quantities like pressure, temperature, density, viscosity, etc. Are independent of mass. What are these called ?
Explain bearing
what is Retainer?
please send me latest hindustan petrolium papers
