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Power Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Does not contain dissolved oxygen






2. 1. Carbon ring 2. labyrinth seal 3. water seal






3. Pressure drops across the moving blades






4. Compression ignititon engines






5. Steam expands and pressure drops as it passes through moving blades - unbalance pressure






6. Either fixed production or varying






7. A concentrated solution at its critical point






8. Change in momentum

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9. Primary fuel produces high thermal energy for processes - the waste heat is used to produce electrical energy

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10. Moderate compression ratio - giving improved volumetric efficiency - but not lower discharge air temperature






11. A thrust block that enables the axial position of the rotor to be controlled






12. 1. deman reservoir 2. avoid overloading compressor 3. dampens deew point and temperature spikes rom air dryer






13. 1. Difference in pressure across moving blades 2. steam leaks around edges 3. minimal blade clearances 4. unbalanced thrust






14. 1. backpressure 2. condensate levels 3. contanimation 4. vacuum pay- off relays (10 to 40kPa) 5. vacuum trip relays (50kPa)






15. To remove and properly dispose of pollutants






16. 1. vent to atmosphere 20% 2. condensing 30% 3. exhaust steam used for work 80%






17. Use of a rotary lobe air blower






18. Working fluid is compress then preheated in regenerator






19. Large turbines couple together on a single shaft applied to one generator






20. Sagging and hogging - 20-40rpm






21. 1. increases net power 2. clean working fluid 3. cheap fuel can be used






22. 1. brass 2. copper 3. cupronickel






23. Equal and opposite reation

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24. 1. Condensing 2. non - condensing (backpressure)






25. 1. large volums of air at medium pressures - high speed 2. free air capacities range from 2.8 to 3700 cubic meters






26. Seperately forged discs or wheels and shrunk onto shaft






27. Overall master plan - comprehensive program






28. Change in direction causing a turbine to move






29. 1. high pressure cutout 2. oil pressure cutout 3. pressure relief devices






30. Large turbines with a generator on each shaft






31. Monel metal - high tensile strength - nickel copper alloy






32. Cool compressed air before point of use






33. 1. large volumes of air 2. simple and rugged 3. low maintenance






34. A1 - A2 - A3 - B1 - B2 and B3 A = toxicity not identified under 400ppm B = toxicity identified under 400ppm 1 = not flammable 2 = low flammable limit 3 = highly flammable






35. 1. prevent wear 2. reduce friction 3. remove heat 4. reduce corrosion 5. provide sealing






36. Used to open and close the by- pass port in a stator - varies the volum compressed air being produced






37. On the exhaust side - drives the blower - being connected to the same shaft - increases power by 50-70% as more air is forced into the engine






38. Have advantage of high efficiencies - 10% greater than centrifugal compressors






39. Dry surface coolers - no contact convection hx - aka finned tube exchangers






40. CFC group - safe nontoxic - but long atmospheric life span of 100 years - boiling point of -29.8






41. 1. bare tube 2. finned tube 3. plate surface - a vacuum exists between plates






42. 1. low power consumption 2. frequent load changes 3. adjustable 4. suction valve change easily






43. 1. commercial establishments 2. industrail processes 3. localized central heating of small plants






44. 1. Pressure compounding 2. velocity compounding 3. pressure- velocity compounding






45. Refers only to specificly to the turbine section

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46. 1. titling pad Kingsbury (journal bearing) 2. Michel thrust bearing






47. Main purpose to protect the evnironment (air - water and soil) and create public awareness - involves training - monitoring and reporting






48. 1. cooling water in direct contact 2. drains into a hotwell 3. barometric leg - condenser sits 10.34m above hotwell






49. Used on large turbines to supply lower part of the bearing with oil to prevent metal to metal contact






50. Results in pressure drop and increased velocity