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






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






3. 1. throttle inlet valve 2. reduce compressor speed 3. automatic discharge vent line 4. anit- surge valve - reciruclation 5. anti- surge microprocessor - kickback valve






4. Large pressure drop - increase volume to match the increase in steam volume and pressure decreases






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






6. Counter act force and load on thrust bearings






7. Moisture removed by centrifugal force






8. Cooling of air between stages - condense below atmospheric temperature removing moisture - not primary function






9. 1. convergent 2. convergent- divergent






10. Made of polyethylene - skimming from the surface






11. Each shaft needs a thrust bearing






12. 1. Single flow 2. double flow 3. automatic extraction 4. backpressure






13. Overall master plan - comprehensive program






14. Does not contain dissolved oxygen






15. As prime movers in pulp and paper industry






16. Made of cast iron and support by stay bolts to protect against a vacuum






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


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






19. Sagging and hogging - 20-40rpm






20. Pressure drops across the moving blades






21. Reduces steam pressure and velocity in two or more steps






22. One or more tube bundles - in one or more bays for an individual service or process






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






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






25. Used to satisfy process steam requirements






26. Waste heat only






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






28. Unit produces electricity on an ongoing basis






29. Produce and maintain a vacuum at the turbine exhaust allowing steam to expand to a lower pressure and do more work






30. Eliminates thrust - steam admitted midway along casing






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






32. Means to come together and form one mass - removes oil and water from air






33. Contains 0.5kg of moisture for every 28 cubic meter of air






34. KW at 15C standard at sealevel with 60% RH






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






36. Results in pressure drop and increased velocity






37. 1. to increase steam production 2. control superheater temperatures 3. meet process demands






38. At high temperatures a material stretches






39. 5mm in diameter






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






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






42. Good thermal properties - boiling point of -33.3 - pure anhydrous ammonia is noncorrosive - cheap - not miscible in oil - toxic






43. Driving rotating equipment






44. Nickel steel - strong fully balanced rotor - expensive






45. 1. collection system 2. seperation pond 3. flare pit 4. stabilization lagoon 5. wastewater heater 6. 1st stage aeration tank - activated sludge 7. 2nd stage aeration tank 8. clarifiers 9. polishing pond






46. Working fluid is compress then preheated in regenerator






47. Condensing turbines exhaust steam at...






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






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






50. 1. list of all equipment 2. PM checklist 3. fequency 4. repairs and costs 5. record keeping 6. cost management