Test your basic knowledge |

Power Engineering

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. P & IDs






2. Velocity ratio is...






3. Acute angle






4. Safe working stress is determined by...






5. As the cosine decreases - the...






6. Copper fails due to...






7. A body having a gravitational force of 2000 N - is pulled along a horizontal surface at constant speed by a rope that makes an angle of 20






8. coefficient of volumetric expansion

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9. Work per power stroke (J)






10. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%






11. A quadrilateral with two parallel sides






12. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second






13. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel






14. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands






15. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change






16. Moist hydrogen sulphide environment - hydrogen sulphide must be present - water - even trace amount - high strength steel - steel must be under tensile stress - either applied or residual






17. 1. In a right angle triangle - the sine of an acute angle is equal to...






18. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)






19. Testing metals and nonmetals of low to medium hardness. uses a ball that is pressed into material and basis calculations on the diameters of ball and indentation.






20. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only






21. The ratio of the density of a substance to the density of a standard substance at the same temperature and pressure - the ratio of the density of the substance to the density of the substance to the density of water






22. The most common scale in use is the...






23. Dangerous because a crack starts slowly and propagate slowly - exceed breaking strength and the metal fails suddenly - stress must be tensile can be produced by an external load or residual stress - condensed moisture and change in temperature






24. A 10 m long steel pipe when heated to increase its temperature by 85






25. Change in tempereature where no heat in transferred - PV(supercript v) = C






26. The force that is equal in magnitude but opposite in direction to the resultant force is called






27. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies






28. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known






29. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.

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30. Pythagoras' Theorem






31. Whether a material will break under sudden impact or hard blow






32. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation






33. The term _____ is used as a measure of the quantity of matter.






34. A parallelogram with adjacent sides of unequal lengths






35. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal






36. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second






37. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear






38. Protons have a mass number of...






39. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor






40. Ratio of the opposite to the adjacent side of a right- angled triangle






41. A pinch of salt is added to a glass of water. The result is...






42. Sine Rule






43. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree






44. Factor of safety






45. The law that states that for a fixed amount of gas at a constant pressure - the volume of the gas increases as the temperature of the gas increases and the volume of the gas decreases as the temperature of the gas decreases






46. A straight line that joins 2 points or circumference






47. A quadrilateral with no parallel sides






48. The most common material used in making large industrial diesel engine pistons is...






49. Any two angles whose sum is 90






50. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...