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. Force - work done - power - mechanical efficiency






2. PFDs






3. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10






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






5. As the cosine decreases - the...






6. Cosine rule






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






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






9. A scalar quantity is one which has only magnitude and can be fully described by...






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






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






12. Copper fails due to...






13. 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...






14. Work per power stroke (J)






15. 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






16. Expansion of a gas is said to be adiabatic when expansion takes place at...






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






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






19. Resists oxidation - high strength at high temperatures - increases hardness and abrasion resistance without increasing brittleness - increases response to heat treatment - increases depth of hardness penetration - at 12% chromium steel with not tarni






20. 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






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






22. PVn(super script n) = C






23. Micro organisms promote corrosion...






24. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details






25. Steam turbine bearings are usually made of...






26. Is the required to change a unit mass from a gas to liquid or liquid to a gas






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






28. coefficient of expansion






29. The rate at which heat flow through a slab of a material does not depend on...






30. Being made of 2 or more substances creating unique characteristics and properties when combine






31. Malleable cast iron is produced by...






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






33. The classes of fastening devices are...






34. 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.






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






36. Obtuse angle






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






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






39. Safe working stress is determined by...






40. Compounds classified as salts may have the following characteristics






41. The most common thread used in North America on fasteners such as bolts - is the...






42. 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






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






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






46. Straight angle






47. 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






48. Work per second






49. Potential energy (Ep)






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