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






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






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






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






5. Pythagoras' Theorem






6. Safe working stress is determined by...






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






8. 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






9. Work per power stroke (J)






10. Force






11. 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






12. Acute angle






13. Obtuse angle






14. A closed plane figure bounded by straight sides






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






16. Right angle






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






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






19. Straight angle






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






21. coefficient of superficial (area) expansion






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






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






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






25. The act or process of measuring






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






27. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke






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






29. A parallelogram with adjacent sides of unequal lengths






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






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






32. P & IDs






33. Resistance to wear - abrasion and penetration






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






35. Velocity ratio is...






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






37. The precise measurement of heat flow out of a system for chemical and physical processes






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






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






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






41. 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...






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






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






44. As the cosine decreases - the...






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






46. A straight line that joins 2 points or circumference






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






48. Kinetic energy (Ek)






49. 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






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