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. Potential energy (Ep)






2. A closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it A = piab or A = pi(1/2D)(1/2d) - same as = (pi/4)D/d






3. Negative terminal of the rectifier must always be connected to the structure that is being protected






4. Any two angles whose sum is 90






5. PFDs






6. Pythagoras' Theorem






7. 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.






8. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...






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






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






11. 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






12. 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






13. P & IDs






14. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2






15. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp






16. Obtuse angle






17. A quadrilateral with two parallel sides






18. A triangle with two equal sides






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






20. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...






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






22. 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






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






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






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






26. u = initial velocity (m/s) - v = final velocity (m/s) - t = time (s) - s = distance (m) - a = acceleration (m/s/s) - g = acceleration due to gravity (m/s/s)






27. The amount of heat required to completely melt 25 kg of ice from a temperature of -10






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






29. In a pipe if no fluid is added or removed - flow must remain constant - due to the product of area and velocity being constant - flow must be the same going in as coming out of pipe






30. The classes of fastening devices are...






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






32. Work per power stroke (J)






33. Mechanical efficiency






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






35. Reflex angle






36. A parallelogram with four equal sides






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






38. Resistance to wear - abrasion and penetration






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






40. The ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface u = tan(thada) - coefficient of friction is equal to the tangent of friction angle






41. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.






42. Right angle






43. The factor of safety is always expressed...






44. Sine Rule






45. 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...






46. Force






47. 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...






48. 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






49. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...






50. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion