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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. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
A = 4/3h2 [(square root)d/h-0.608]
Value of the angle increases
520.72 kJ/kg
A / SinA = b / SinB = c / SinC

2. Compounds classified as salts may have the following characteristics
Divide the maximum load by the original cross - sectional area
Conditions required to produce sulphide corrosion cracking
As a ratio
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

3. 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
Pm x A x L x N
Relative density
Scalene triangle
distance

4. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
That is supported at two ends
benefits of copper
hexagon
Heat engines

5. 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
Stress corrosion cracking
dryness fraction
Stray current corrosion
As a ratio

6. Safe working stress is determined by...
Dividing the ultimate strength by the factor of safety
Toughness
10.8 m N of W
Mensuration

7. Stainless fails due to...
0.0723
Unified National
Chlorides
hardness

8. 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
To calculate power from an engine
velocity
Purpose of P & IDs
ellipse

9. Protons have a mass number of...
linear motion relationships
One
Less than 90 degrees
hexagon

10. Force
Less than 90 degrees
Mass x acceleration (N)
Material balance
Continuity flow

11. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
dryness fraction
Problem solving order
Relative density
Gamma - coefficient of superficial = 2x coefficient of linear expansion

12. 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
A
benefits of chromium
The equilibrant
Mass x acceleration (N)

13. 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)
Exactly 180 degrees
Value of the angle increases
linear motion relationships
Celsius

14. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Material balance
Cast iron
Purpose of material balance
basic oxygen process

15. 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 twisting or turning effect
A / SinA = b / SinB = c / SinC
57.48 mm
White

16. Velocity ratio is...
Coefficient of friction
Opposite side / hypotenuse
Ideal mechanical advantage
Mechanical flow diagrams

17. Pythagoras' Theorem
1/2mv2 (kg x velocity(m/s))
Purpose of P & IDs
latent heat of evaporation (vaporation)
A

18. The most common scale in use is the...
Chord
A
Celsius
520.72 kJ/kg

19. Reflex angle
The elastic limit of the material is not exceeded
Greater than 180 degrees
M x g x h (kg x 9.81 m/s/s x height (m))
Octagon

20. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
More than 90 degrees
Hooke's Law
70 MPa
Resultant

21. Ratio of the opposite to the adjacent side of a right- angled triangle
Problem solving order
ellipse
Celsius
Tangent

22. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
Specific heat
Power
Sensible heat
26.81 m/s

23. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
benefits of chromium - nickel and copper in alloy steels
M x g x h (kg x 9.81 m/s/s x height (m))
110.6 kPa
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only

24. A 1 N weight has a kinetic energy of 1 J when its speed is...
Boyle's law
Isosceles triangle
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
4.4 m/s

25. Energy can be...
Ideal mechanical advantage
Resultant
Transformed to different forms
The specific heat of the material

26. 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...
dryness fraction
Cast iron
10.8 m N of W
161

27. The temperature of saturated steam vapor at 980 kPa is...
179.02
Output power(W)/input power(W)
10.8 m N of W
Coefficient of friction

28. When classifying beams - the term simple beam refers to a beam
One
Falling temperature
View of a cutting plane
That is supported at two ends

29. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Mensuration
Stroke
57.48 mm
Problem solving order

30. 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
displacement
hardness
Isothermal
Mass x acceleration (N)

31. Straight angle
Exactly 180 degrees
Divide the maximum load by the original cross - sectional area
Isothermal
520.72 kJ/kg

32. Orthographic projection means...
A
Problem solving order
View of a cutting plane
Mensuration

33. A parallelogram with adjacent sides of unequal lengths
dryness fraction
Transformed to different forms
Dividing the ultimate strength by the factor of safety
Rhomboid

34. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
General gas law
Resultant
water equivalent
Sulfuric acid

35. Force - work done - power - mechanical efficiency
Problem solving order
1 cm
To calculate power from an engine
520.72 kJ/kg

36. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
Isothermal
Toughness
The equilibrant
Be the same at any point in the process

37. coefficient of volumetric expansion

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38. Work per second
Heating and cooling white cast iron at a controlled rate
Greater than 180 degrees
Pm x A x L x N
A = 4/3h2 [(square root)d/h-0.608]

39. Being made of 2 or more substances creating unique characteristics and properties when combine
Falling temperature
Less than 90 degrees
Composite material
70 MPa

40. A closed plane figure bounded by straight sides
polygon
1 cm
Continuity flow
0.89

41. A quadrilateral with no parallel sides
Continuity flow
Trapezium
Isothermal
Areas of sectors (bounded by 2 radii and arc between them)

42. Negative terminal of the rectifier must always be connected to the structure that is being protected
Cathodic protection system
View of a cutting plane
water equivalent
Work

43. Cosine rule
Scalene triangle
A
Ideal mechanical advantage
Trapezoid

44. Copper fails due to...
linear motion relationships
110.6 kPa
Pm x A x L x N
Ammonia

45. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
A twisting or turning effect
effective pressure
1 cm
Ultimate stress/working stress

46. A automobile travels at 60 miles per hour. Expressed in metres per second - this would be equivalent to...
26.81 m/s
Toughness
Ammonia
Stray current corrosion

47. 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?
Adiabatic
Isosceles triangle
Chlorides
45 kN

48. As the cosine decreases - the...
That is supported at two ends
Tangent
ellipse
Value of the angle increases

49. A triangle with two equal sides
Isosceles triangle
latent heat of evaporation (vaporation)
White metal and bronze
10.8 m N of W

50. Expansion of a gas is said to be adiabatic when expansion takes place at...
Rhombus
Exactly 180 degrees
A
Falling temperature

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Power Engineering

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