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






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






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






4. Energy can be...






5. 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






6. Safe working stress is determined by...






7. H2SO4 is the chemical formula for...






8. A closed plane figure bounded by straight sides






9. Stainless fails due to...






10. Refers to change in the position of the body - relative to some reference point - not concerned with actual distance traveled - a vector quantity with magnitude and direction






11. The classes of fastening devices are...






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






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






14. A quadrilateral with no parallel sides






15. Force






16. One is the trigonometric value of...






17. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm






18. 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






19. coefficient of superficial (area) expansion






20. 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






21. 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






22. Micro organisms promote corrosion...






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






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






25. Straight angle






26. 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...






27. 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






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






29. A straight line that joins 2 points or circumference






30. 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






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






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






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






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






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






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






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






39. Velocity ratio is...






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






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






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






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






44. The act or process of measuring






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






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

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






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






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






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