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






2. The heat required to raise the temperature of water at a pressure of 225 kPa from 0






3. When calculating the ultimate stress of a material - we should






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






5. Orthographic projection means...






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






7. 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






8. When heat is supplied to a liquid in sufficient quantity to change the liquid to a vapour without changing the temperature - the heat supplied is known as...






9. PVn(super script n) = C






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






11. When classifying beams - the term simple beam refers to a beam






12. A displacement of 9 m north of point A - and another of 6 m west of point A can be added to give a resultant displacement from point A of...






13. Velocity ratio is...






14. Ability to withstand deformation above elastic limit under compression without failure






15. coefficient of expansion






16. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...






17. A triangle with no two sides of equal length






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






19. Straight angle






20. Force - work done - power - mechanical efficiency






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






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






23. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will






24. A closed plane figure bounded by straight sides






25. Sine Rule






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






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

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28. The amount of stretch or compression of an elastic material is directly proportional to the applied force - stress = E (modulus of elasticity) x Strain

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






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






31. A parallelogram with adjacent sides of unequal lengths






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






33. Work per second






34. All sides equal - all angles are equal and opposite sides parallel - divided into 6 ISOSCELES triangles - each angle in an octagon is 135 - A = 4.83s2






35. Of a process or change taking place at constant temperature - PV = C






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






37. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will






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






39. Copper fails due to...






40. Pre- construction - shows graphically the mechanical design engineer's work - during construction - proper location - reference to all equipment - after construction - training reference anddetails of process - utility and electrical systems






41. Pythagoras' Theorem






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






43. A gas occupies 8.62 m3 at 1800 kPa and 26






44. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...






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






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






47. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)






48. In the equation 0.004 + D = 0.0042 - the value of D is...






49. A quadrilateral with no parallel sides






50. As the cosine decreases - the...







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Can you answer 50 questions in 15 minutes?


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