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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. 1. natural gas 5-10% 2. oil 5-15% 3. coal (pulverized) 15-30% 4. coal (stoker fired) 25-50%






2. Used up to 600V circuits - fuses are 250V and 600V made of zinc or alloy in a fiber tube. Amp sizes are 30 -60 -100 -200 -400 and 600A






3. Defined as that quantity of a substance that has a mass in kilograms equal to its molecular mass






4. Large disturnbance and frequency could cause loop not to work properly - processes with large lag will not control






5. 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


6. Is the total opposition - Z






7. 1.product information 2. hazardous ingredients 3. physical data 4. fire and explosion data 5. reactivity data 6. toxicological data 7. preventive measures 8. first aid 9. preperation information






8. Ground faults






9. The output






10. % of the process variable






11. Promote safety and uniformity in the design - construction - installation - operation - testing - and repair of boilers - pressure vessels - and related equipment






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






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






14. A venturi tube without a diverging section - more expensive - tubes can foul and hard to install






15. Discrete input - on - off control






16. Just enough oxygen for complete combustion






17. The rate (derivative control) will counter it and allow the proportional band and integral begin earlier






18. Used in bellows






19. Equal to the charge on 6.242 x 10 to 18th power of electrons - quantity of electricity






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






21. Dielectric constant (gas has a constant of 1) - provides continuous level measurement - used stored potential - no moving parts - can have erros due to change in constant - composition of material and temperature






22. CO2 - SO2 - H20 - O2 - N2 and ash






23. Thermocouple connected in series






24. Point level measurement used to open or close a circuit






25. Magnetic flux produced by one coil that cuts the lines of the conductors of the second coil - creating a voltage induced in the second coil






26. The direction of an induced emf is always such that any current it produces opposes - trhrough its magnetic effects the charge inducing the emf


27. 85% or less of normal value power






28. Pancake or concentric






29. Voltage and current reach their max values at the same time


30. 80m - due to lag - pressure drop






31. Lowers wasted heat - lowers power requriements for forced draft and induced draft fans






32. The effective value of current and voltage - apparent power






33. Can act as an induction motor - 3 directional inverse time overcurrent relays






34. No communicators - voltage can be transformed up or down and has slip rings






35. 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






36. The ability of a coil to produce flux






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






38. Fall under part IV of the controlled product regulations






39. 180 degrees - one pole = one pitch






40. The ratio of change of output to change of input






41. Heavy load deman






42. Terminal voltage decreases with increase of lead - field weakened by reduction of emf and it depends on the residual magnetism in the field circuit






43. Ring type joint gaskets






44. Safety of the life and property






45. Ranges from 42566 KJ/kg to 45350 KJ/kg






46. Constang speed - if field gets disconnected during operation - field dlux drops and motor speeds up






47. Interest of workers - employers - suppliers - regulators






48. Self excited - armature fields conencted in series - initial emf depends on residual magnetism - field current is also the load current






49. Current is changing value. AC continuous changes generates alternating emf unit H - herny - symbol is 'L'






50. Used in feedforward control - signal is fed into the model to trim model parameters - components for imperfections in the feedforward control