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Power Engineering 3

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. Controls current to fields






2. Has a high magnetic reluctance






3. Sum of current flowing away = sum flowing towards - and any closed path in an electrical circuit the sum of the voltages is zero as current passes through the resistors

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4. Thermally sensitive resistor - negative tempertaure co- efficient - non linear with temperature






5. Is the combined effect of inductive reactance and capacitive reactance






6. 1. isolation from upsets 2. improves loop dynamics 3. removes valve charcteristics from the influences 4. second loop provides exact control






7. Is the amount of air in excess of theoretical air






8. Can have a leading PF - lowering the plant energy costs






9. Used to linearize the measurement signal






10. Occurs when some of the elements pass to the stack






11. Rectifier - battery bank - inverterm static switch - 1/4 cycle response time - generator supplies power to UPS - bumpless transfer - 60 second delay on power restore






12. RTU (remote terminal unit) and MTU (master terminal unit) - modems or data communication equipement (DCE)






13. Range of 250mm water to 350kPa






14. Flammables and combustibles






15. Renewable resource and usually waste products of other process and uses






16. Occurs when all of the combustibles in the fuel are completely burned - but more air than the minimum theoretically required is used (excess air)






17. PLC control diagram






18. The percent of the process variable range that causes 100% change in the controller output






19. 6 times its normal full load current






20. Is a strategy whereby one process is controlled in a specific ration to another process variable






21. 1. anthracite 2. bituminous 3. sub- bituminous 4. lignite






22. All of the combustible in the fuel are completely burned and excess air






23. The offset of a proportional controller decreases to maintain SP






24. Contains 1 kg of oxygen






25. Low accuracy at low velocities - can plug with certain fluids - sensitive to local disturbances






26. Developed to replace control loops






27. High heat transfer coefficient - low density (1/4 of air) and can increase output up to 20-30% of transformer






28. 85% or less of normal value power






29. Faults in the system causing to break up into islands - an imbalance between the generator and the load






30. Conencted to transformers or inside switchgears






31. 1. line impedance starters - resistance in series for each phase 2. star- delta - using a special switch - inexpensive - current surge 3. auto- transformer - expensive - best starting torque






32. 1. dry barrel - valve located below the frost line 2. wet barrel






33. Shunt - series and compound wound






34. RMS; AC voltage that equals DC voltage that will do the same amount of work. For an AC sine wave it is 0.707 x peak voltage. Effective value






35. Current before voltage - capacitance load






36. Current flow only when the current is changing in value






37. Canadian Standard Association (CSA) - American Society of Mechanical Engineers (ASME) - National Board of Boiler and Pressure Vessel Inspectors (NBBI)






38. Smallest cross sectional area






39. Heavy load deman






40. Dark brown in color - laminar structure - often with remnants of woody fibers present. Tough but not hard - when exposed to air it loses moisture rapidly and crumbles






41. Special squirrel cage winding in a synchronous machine - damper winding fitted into slots in the rotor pole faces






42. Is the free electrons that are attracted by the positive terminal of thevoltage supply and will flow out continuously from the negative terminal






43. The fule - the method of firing - the burner and furnace design and load on boiler






44. Work to elimate errors






45. 1. pneumatic 2. electronic 3. optical






46. Refer to pg 27.2.1 of ASME academic extract - do not interpolate between values - select next higher rated value






47. Operates on the principle that the resistance of metal increases in direct proportional to increases in temperature - positve co- efficient - wheatstone bridge






48. Pulse generator operates at 3-40kHz






49. Unit of a fuel that is burned completely - for gas use kJ/cubic meter at standard 16 degrees at 101.3kPa






50. Shunt parallel with the armature