Test your basic knowledge |

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. PLC control diagram






2. 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






3. Is the current in any line voltage - phase volts






4. One controlled variable and two manipulated variable as output - 'Duplex Controlres






5. Control of supply side disturbances by feedback - single loop






6. Establish rules of safety covering the design - fabrication - and inspection during construction of boilers and pressure vessels - and to interpret these rules when questions arise






7. Expensive - externally mounted - not accurate for densisty changes






8. Used in building over 3 stores - 14m






9. Thermal coutout and a fuse link - cutout at 500% of normal current - greatest protection for motor currents






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






11. Correct inductive loads - unit is called a farad (F) and the symbol used is 'c'






12. 1. pneumatic 2. electronic 3. optical






13. 0.5 cubic meters (18 cubic feet)






14. Always exist - as the gain increases the offset decreases






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






16. Liquid being measured must be able to mix with the gas or air in the bubbler






17. Load current is also the excitation current - never operate without a load - has high starting torque






18. Pipe thickness must be increased by 15% or 3.0mm






19. Have 2 conductors - example is telephone and radio currents






20. I - NPS 63mm II - NPS 38mm III - NPS of bother 63mm and 38mm






21. Flammables and combustibles






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






23. Is the total opposition - Z






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






25. Material - size and temperature






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






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






28. Cells that create emf using light






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






30. Oscillate - on - off control behavior






31. Acts like on - off controller






32. Allows control from one location






33. 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






34. Shunt parallel with the armature






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






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






37. Casues the neutral plane within whcih brushes have been placed to shift - so that the brushes are now shorting the coils - which produce voltage (sparking) - use interpoles to neutralize condition






38. Salient and cylindrical






39. Used in sealed or pressurized tanks






40. 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






41. Quantity of current flow is inversely proportional to the resistance for a given voltage I = E/R


42. 180 degrees - one pole = one pitch






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






44. 6 times its normal full load current






45. Conencted to transformers or inside switchgears






46. Counter emf - current limit and time limit






47. Work to elimate errors






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






49. Discrete input - on - off control






50. Shunt parallel withe the armature and series field