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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. 1. need cooling water 2. low hx efficiencies 3. complex in size - increase in costs






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






3. 1. better than gantt chart 2. establishes feasible sequence 3. timetable 4. spare time plotted 5. critical activities 6. use of arrow diagrams 7. event (aka nodes) - a situation that occurs after a completed activity 8. schedule manpower efficiently






4. 1. start and stop control (reciprocating compressors) 2. variable speed (dymanic and rotary compressors) 3. constant speed (positive displacement)






5. Has the highest level of thermal efficiency - low capital costs - fast start up - quick to build - low maint cost






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






7. 1. lowers power consumption 2. load changes frequently 3. pilot valve controls loading - adjustable






8. Does not contain dissolved oxygen






9. 1. contact - 'jet' 2. surface






10. Quantity ofr compressed air and delivered air by the compressor






11. 1. walnuts 2. rice 3. carbo- blase 4. offline water wash - best method






12. Rows of stationart baldes with alternating rows of moving blades






13. Entire collection of all component

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14. DLN - reduce NOx down to 9ppm but have an increased combustion area






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






16. 1. compressor discharge 2. condenser 3. liquid receiver






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






18. 1. kettle 2. thermosyphon horizontal 3. thermosyphon vertical






19. 1. charge drawn into cylinder is air only 2. fuel injected at high pressures 3. ignition due to high compression temperatuers






20. Either fixed production or varying






21. HCFC group - miscible in oil - boiling point of -40.8 but can be used down to -87






22. Sagging and hogging - 20-40rpm






23. Controlled pressure from intermediate stages of turbine






24. Same principle as a turbine but acting in reverse






25. Contains dissolved oxygen






26. 1. planning 2. implementation 3. review






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






28. Working fluid is compress then preheated in regenerator






29. Most widely used - least amount of steam






30. Small clearances between discs on shaft to...






31. 1. simple design 2. less piping 3. no freezing hazard






32. 1. plate 2. channel






33. Cannot go below -18






34. Unit produces electricity on an ongoing basis






35. Results in a gain in velocity - the moving blades change direction producing force






36. More rounded than impulse blading






37. Throttle body






38. Results in pressure drop and increased velocity






39. Pressure drops across the moving blades






40. The crankshaft and valve train






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






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






43. Needs to a high vacuum present in system before charging






44. Radiator type






45. '3 ports' 1. intake and exhaust 2. compression and ignititon






46. Small pressure drop






47. King valve






48. 1. control range of 0 to 100% load 2. energy efficient






49. Chrome- iron alloy






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