Mechanical Engineering Interview Questions
Questions Answers Views Company eMail

what is the difference between under vacuum & under pressure boiling?

905

difference between internal energy and enthalpy?

MAHINDRA,

872

Which type of gear train used in Wrist watch?

L&T, Escorts, Bhel,

5 16726




Internal energy of a substance depends on

Bhel,

2 6854

Work done in compressing 1kg of gas adiabatically from p1,V1,T1 to p2, V2, T2 is equal to

Bhel, Swaraj,

3 4100

If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the: a) exhaust will be smoky b) piston rings would stick into piston grooves c) exhaust temperature will be high d) engine starts overheating e) all of the above.

Bhel,

7 9384

One wink is equal to how many minutes?

Bhel, SR,

4 6306

In Automobile Transmission System,The clutch is in b/w Transmission system & ___________

Bhel,

8 7652




Gegger is used in foundry for the purpose of____________

Bhel, ARM,

885

Solar Cells stores the Energy In the form of a)Mechanical Energy b)Electric Energy c)Heat Energy

Bhel,

3 3503

Escape Velocity of Earth is

Bhel,

2 2216

Which instrument is used to measure the Inner diameter,outer dia,Thichness & Depth.

Bhel,

1 3527

Corundum mainly Contains__________

Bhel, Behr,

1 1850

Which Property Shows Resistance to flow?

Bhel,

2 2438

Which Surface hardening is preferrable for heating some portion of Component? a)Surface hardening b)Flame Hardening c)Nitriding

Bhel,

5 3011


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Un-Answered Questions { Mechanical Engineering }

Difference between turbocharging and supercharging in diesel engines?

270


Why and what cause of leak fuel oil in high pressure pipe of main engine?

639


what is routh,s law in thermal engineering ?

1011


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?

884


wt is dynamic coupling????

784






Why in screw & centrifugal compressor using rolor bearing

725


What is the maximum P-max for a cylinder in M/E.

798


what is the calculation of selection ofan capacity is 12000m3/hr.

643


WHAT IS THE DIFFERENCE B/W LUBE OIL 20 W 40 AND 20 W 40 OIL.

768


which type of que can be asked in this company?

679


why does polytropic efficiency of a compressor decrease with increasing flow rate ?

1274


Is radiography require in IBR piping of size 40 NB(1 1/2" inch)?

207


Purpose of stern tube sealing

696


what is STOCT TURN OVER RATIO

856


What is the thermal efficiency of a diesel engine?

721