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Power 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
elasticity
distance
Pm x A x L x N
Divide the maximum load by the original cross - sectional area

2. P & IDs
polytropic
Mechanical flow diagrams
Ammonia
benefits of nickel

3. One is the trigonometric value of...
The equilibrant
57.48 mm
A. sine of 90
Under deposit corrosion - enhanced oxygen generation - contact of live organisms

4. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Purpose of P & IDs
520.72 kJ/kg
Toughness
Composite material

5. Any two angles whose sum is 90
That is supported at two ends
Total heat required for change of state
Complementary angles
brinell hardness test

6. Force - work done - power - mechanical efficiency
Mass x acceleration (N)
Purpose of P & IDs
View of a cutting plane
Problem solving order

7. Acute angle
Less than 90 degrees
45 kN
M x g x h (kg x 9.81 m/s/s x height (m))
Chord

8. Pythagoras' Theorem
The elastic limit of the material is not exceeded
A
Pm x A x L
Ideal mechanical advantage

9. As the cosine decreases - the...
Value of the angle increases
The specific heat of the material
Charles Law
Stroke

10. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
To calculate power from an engine
Work
hardness
Power

11. Factor of safety
Ultimate stress/working stress
Permanent and removable
Transformed to different forms
Trapezoid

12. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
Value of the angle increases
Isothermal
velocity
Continuity flow

13. The classes of fastening devices are...
Permanent and removable
Specific heat
A. sine of 90
A Greek letter alpha linear

14. The most common scale in use is the...
Charles Law
effective pressure
Increase
Celsius

15. Mechanical efficiency
More than 90 degrees
Stray current corrosion
Output power(W)/input power(W)
Sulfuric acid

16. Safe working stress is determined by...
Trapezium
Value of the angle increases
Details of P & IDs
Dividing the ultimate strength by the factor of safety

17. A triangle with two equal sides
Stress corrosion cracking
More than 90 degrees
Isosceles triangle
Exactly 180 degrees

18. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
8908 kJ
Boyle's law
Pm x A x L x N
A Greek letter alpha linear

19. 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
Permanent and removable
0.0723
0.0002
Conditions required to produce sulphide corrosion cracking

20. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
A Greek letter alpha linear
70 MPa
A / SinA = b / SinB = c / SinC
A = 4/3h2 [(square root)d/h-0.608]

21. Velocity ratio is...
Ideal mechanical advantage
Tangent
2.3026
Divide the maximum load by the original cross - sectional area

22. Cosine rule
57.48 mm
A
To calculate power from an engine
Rhombus

23. coefficient of expansion
benefits of nickel
A Greek letter alpha linear
Dividing the ultimate strength by the factor of safety
26.81 m/s

24. Kinetic energy (Ek)
4.4 m/s
Stress corrosion cracking
benefits of chromium
1/2mv2 (kg x velocity(m/s))

25. The most common material used in making large industrial diesel engine pistons is...
Coefficient of friction
Cast iron
Boyle's law
Less than 90 degrees

26. A parallelogram with adjacent sides of unequal lengths
Rhomboid
dryness fraction
As a ratio
Stray current corrosion

27. A body having a gravitational force of 2000 N - is pulled along a horizontal surface at constant speed by a rope that makes an angle of 20
Gamma - coefficient of superficial = 2x coefficient of linear expansion
2.3026
0.0723
hardness

28. Resistance to corrosion and oxidation at high temperatures - improves toughness - prevents brittleness at low temperatures - increases strength without affecting toughness - amounts range from 1-4% - high impact resistance at amounts as high as 36% -
Latent heat of evaporation
benefits of nickel
0.89
Toughness

29. Obtuse angle
Permanent and removable
Output power(W)/input power(W)
Stress corrosion cracking
More than 90 degrees

30. The ability to return to its original shape after an external force has been removed
effective pressure
M x g x h (kg x 9.81 m/s/s x height (m))
benefits of chromium
elasticity

31. A scalar quantity is one which has only magnitude and can be fully described by...
Less than 90 degrees
A number with the necessary unit
The elastic limit of the material is not exceeded
Resultant

32. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
Purpose of material balance
View of a cutting plane
179.02
benefits of chromium - nickel and copper in alloy steels

33. 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)
brinell hardness test
linear motion relationships
Material balance
Areas of sectors (bounded by 2 radii and arc between them)

34. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
Chord
velocity
2.3026
A

35. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
White
Divide the maximum load by the original cross - sectional area
10.8 m N of W
Details of P & IDs

36. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
A
57.48 mm
displacement
Malleability

37. A closed plane figure bounded by straight sides
The elastic limit of the material is not exceeded
Celsius
Process flow drawing
polygon

38. Ability to withstand deformation above elastic limit under compression without failure
Ammonia
Opposite side / hypotenuse
Malleability
Exactly 180 degrees

39. Stainless fails due to...
Chlorides
8908 kJ
A Greek letter alpha linear
water equivalent

40. Change in tempereature where no heat in transferred - PV(supercript v) = C
A number with the necessary unit
Adiabatic
4.4 m/s
520.72 kJ/kg

41. Potential energy (Ep)
Process flow drawing
M x g x h (kg x 9.81 m/s/s x height (m))
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

42. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Adiabatic
Rhomboid
elasticity
Naperian (Natural) logarithms

43. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
57.48 mm
Toughness
hexagon
Stray current corrosion

44. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
Resultant
1/2mv2 (kg x velocity(m/s))
General gas law
26.81 m/s

45. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
water equivalent
Specific heat
Total heat required for change of state
Value of the angle increases

46. Work per power stroke (J)
More than 90 degrees
A = 4/3h2 [(square root)d/h-0.608]
Pm x A x L
Latent heat of evaporation

47. Energy can be...
Transformed to different forms
Value of the angle increases
Heating and cooling white cast iron at a controlled rate
Pm x A x L

48. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
A twisting or turning effect
Be the same at any point in the process
Specific heat

49. Right angle
Mechanical flow diagrams
A Greek letter alpha linear
One angle is exactly 90 degrees
Total heat required for change of state

50. A quadrilateral with no parallel sides
Calorimetry
Trapezium
1 cm
Purpose of P & IDs