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Power Engineering

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. Negative terminal of the rectifier must always be connected to the structure that is being protected
Trapezoid
A / SinA = b / SinB = c / SinC
Cathodic protection system
Resultant

2. Work per power stroke (J)
179.02
57.48 mm
Pm x A x L
Chord

3. 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
Scalene triangle
Stress corrosion cracking
Stroke
A

4. 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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5. A quadrilateral with no parallel sides
A number with the necessary unit
Trapezium
Purpose of P & IDs
benefits of chromium

6. A gas occupies 8.62 m3 at 1800 kPa and 26
Stress corrosion cracking
161
Isothermal
A

7. Of a process or change taking place at constant temperature - PV = C
Pm x A x L
A = 4/3h2 [(square root)d/h-0.608]
Isothermal
brinell hardness test

8. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
More than 90 degrees
Naperian (Natural) logarithms
Trapezium
Purpose of P & IDs

9. A 10 m long steel pipe when heated to increase its temperature by 85
Stray current corrosion
dryness fraction
1 cm
Falling temperature

10. A 6 m long cantilever beam carries a concentrated load of 45 kN at its free end. What is the shear force at the wall?
ellipse
45 kN
velocity
Material balance

11. Micro organisms promote corrosion...
Latent heat of evaporation
distance
Output power(W)/input power(W)
Under deposit corrosion - enhanced oxygen generation - contact of live organisms

12. As the cosine decreases - the...
dryness fraction
Value of the angle increases
Relative density
Composite material

13. Sine Rule
A / SinA = b / SinB = c / SinC
Work
Mass x acceleration (N)
White metal and bronze

14. coefficient of volumetric expansion

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15. Kinetic energy (Ek)
110.6 kPa
1/2mv2 (kg x velocity(m/s))
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Increase

16. Acute angle
Less than 90 degrees
Power
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Gamma - coefficient of superficial = 2x coefficient of linear expansion

17. The precise measurement of heat flow out of a system for chemical and physical processes
70 MPa
Calorimetry
Toughness
More than 90 degrees

18. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Increase
8908 kJ
Toughness
Dividing the ultimate strength by the factor of safety

19. Is the required to change a unit mass from a gas to liquid or liquid to a gas
To calculate power from an engine
latent heat of evaporation (vaporation)
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Transformed to different forms

20. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
M x g x h (kg x 9.81 m/s/s x height (m))
Purpose of material balance
A
Naperian (Natural) logarithms

21. 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% -
Resultant
Ultimate stress/working stress
benefits of nickel
A = 4/3h2 [(square root)d/h-0.608]

22. Area of a segment
View of a cutting plane
A = 4/3h2 [(square root)d/h-0.608]
Problem solving order
Calorimetry

23. Factor of safety
Pm x A x L x N
Octagon
Conditions required to produce sulphide corrosion cracking
Ultimate stress/working stress

24. A closed plane figure bounded by straight sides
polygon
White metal and bronze
A = 4/3h2 [(square root)d/h-0.608]
Falling temperature

25. The most common scale in use is the...
The elastic limit of the material is not exceeded
Be the same at any point in the process
Celsius
benefits of chromium - nickel and copper in alloy steels

26. When classifying beams - the term simple beam refers to a beam
velocity
Less than 90 degrees
8908 kJ
That is supported at two ends

27. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
distance
polytropic
Pm x A x L x N
General gas law

28. The ability to return to its original shape after an external force has been removed
Permanent and removable
elasticity
A twisting or turning effect
Total heat required for change of state

29. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Charles Law
A. sine of 90
Details of P & IDs
A solution

30. Malleable cast iron is produced by...
polytropic
brinell hardness test
Heating and cooling white cast iron at a controlled rate
A = 4/3h2 [(square root)d/h-0.608]

31. Ability to withstand deformation above elastic limit under compression without failure
A. sine of 90
Malleability
Toughness
Mass

32. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
displacement
Resultant
Be the same at any point in the process
A

33. Cosine rule
Composite material
One angle is exactly 90 degrees
A
Pm x A x L x N

34. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
polygon
Pm x A x L x N
distance
effective pressure

35. 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
Purpose of P & IDs
Latent heat of evaporation
Conditions required to produce sulphide corrosion cracking
Areas of sectors (bounded by 2 radii and arc between them)

36. Copper fails due to...
polytropic
One
Divide the maximum load by the original cross - sectional area
Ammonia

37. The rate at which heat flow through a slab of a material does not depend on...
A = 4/3h2 [(square root)d/h-0.608]
Stroke
The specific heat of the material
Continuity flow

38. Force
Octagon
Mass x acceleration (N)
White
benefits of nickel

39. The act or process of measuring
Naperian (Natural) logarithms
Resultant
Mensuration
A / SinA = b / SinB = c / SinC

40. Expansion of a gas is said to be adiabatic when expansion takes place at...
displacement
A Greek letter alpha linear
Falling temperature
1 cm

41. Stainless fails due to...
Heat engines
Chlorides
A twisting or turning effect
hexagon

42. Force - work done - power - mechanical efficiency
Divide the maximum load by the original cross - sectional area
Malleability
Problem solving order
Rhomboid

43. Velocity ratio is...
Ideal mechanical advantage
Resultant
2.3026
Exactly 180 degrees

44. The law that states that for a fixed amount of gas at a constant pressure - the volume of the gas increases as the temperature of the gas increases and the volume of the gas decreases as the temperature of the gas decreases
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Charles Law
To calculate power from an engine
Chlorides

45. Mechanical efficiency
Pm x A x L
Output power(W)/input power(W)
Toughness
Isosceles triangle

46. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Scalene triangle
0.0723
basic oxygen process
0.0002

47. In the equation 0.004 + D = 0.0042 - the value of D is...
The equilibrant
0.0002
polygon
latent heat of evaporation (vaporation)

48. 1. In a right angle triangle - the sine of an acute angle is equal to...
Celsius
0.89
Opposite side / hypotenuse
One

49. Compounds classified as salts may have the following characteristics
Stress corrosion cracking
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Pm x A x L
Power

50. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Process flow drawing
Mensuration
The specific heat of the material
To calculate power from an engine

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Power Engineering

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