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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. Countries with small grids or specail grid requirements - has a high efficiency at base loads






2. zeolite molecular sieve desiccant






3. 1. single acting 2. double acting 3. two stage 4. tandem (first stage double acting - 2nd single) 5. free piston






4. Waste heat only






5. Fuel supplied firstg produces electrcial power with thermal energy as a by- product

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6. 1. operates on a temperature difference between substances 2. warm to cold only 3. rate of transfer depends on temperature difference






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






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

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9. Up to 60-90%






10. Higher power and speeds






11. Pieces left on tips of turbine blading so the shrouding canbe attached to correspond with strips






12. Type of hydrometer indicating % of salt in solution






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






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






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






16. 1. planning 2. implementation 3. review






17. 0.577 times the inlet pressure






18. To remove and properly dispose of pollutants






19. Discharge steam when excessive backpressure exists






20. 1. inlet vane 2. electro- pneumatic control 3. microprocessor based control






21. 1. activated sludge 2. rotating biological contactors 3. trickling filters






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






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






24. Calcium chloride and water - -51






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






26. Integral part of the governing system - in the front end and engages at 10-12% above normal operating speed






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






28. Change in direction causing a turbine to move






29. Eliminates thrust - steam admitted midway along casing






30. 1. brass 2. copper 3. cupronickel






31. Change in momentum

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32. Working fluid is compress then preheated in regenerator






33. 1. Gives perfect speed regulation 2. regulates turbine to a constant speed at all loads






34. Does not contain dissolved oxygen






35. Meters liquid from liquid line into evaporator at a rate equal at which vaporization of liquid is occuring






36. Straight condensing






37. 1. start- stop (sliding vane) 2. load- unload (rotary) 3. modulating inlet 4. mircoprocessor based control






38. Cool compressed air before point of use






39. Wrist pins that connect pistons to rod - retained bu circlips






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






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






42. Each shaft needs a thrust bearing






43. 1. high power to weight ration 2. use of different liquids and gaseous fuels 3. start rapidly 4. simple and compact design 5. reliable 6. remote operation






44. Simple generator - light - no battery - hotter spark at higher speeds






45. drum rotors on reaction turbines eliminates...






46. A verticle well is used to increase the NPSH - gives better performance and less cavitation






47. Increased efficiency due to decreased frictional losses






48. Pressure does not drop across the moving blades






49. 1. lubricate sliding surfaces 2. cool bearings






50. The crankshaft and valve train