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Power Engineering

Instructions:

Answer 50 questions in 15 minutes.
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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 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
hardness
Value of the angle increases
Coefficient of friction
Conditions required to produce sulphide corrosion cracking

2. A scalar quantity is one which has only magnitude and can be fully described by...
Work
A. sine of 90
A number with the necessary unit
A

3. Acute angle
Less than 90 degrees
Mass
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Composite material

4. A quadrilateral with two parallel sides
Trapezoid
ellipse
Pm x A x L
1/2mv2 (kg x velocity(m/s))

5. 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)
Unified National
linear motion relationships
0.89
Mass x acceleration (N)

6. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
To calculate power from an engine
179.02
ellipse
110.6 kPa

7. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Chlorides
The elastic limit of the material is not exceeded
Trapezium
Opposite side / hypotenuse

8. The rate at which heat flow through a slab of a material does not depend on...
dryness fraction
Permanent and removable
General gas law
The specific heat of the material

9. Protons have a mass number of...
That is supported at two ends
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Mechanical flow diagrams
One

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
Conditions required to produce sulphide corrosion cracking
Relative density
Cast iron

11. Velocity ratio is...
Ideal mechanical advantage
0.0002
The elastic limit of the material is not exceeded
0.89

12. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
One angle is exactly 90 degrees
Sensible heat
Permanent and removable
That is supported at two ends

13. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Stroke
hardness
Details of P & IDs
2.3026

14. The moment of a force about a point is...
Naperian (Natural) logarithms
A twisting or turning effect
Charles Law
Divide the maximum load by the original cross - sectional area

15. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
White
linear motion relationships
0.89
0.0723

16. The term _____ is used as a measure of the quantity of matter.
White
Mass
Mechanical flow diagrams
A Greek letter alpha linear

17. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Power
Heating and cooling white cast iron at a controlled rate
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Process flow drawing

18. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
70 MPa
Hooke's Law
Process flow drawing
That is supported at two ends

19. Ratio of the opposite to the adjacent side of a right- angled triangle
Exactly 180 degrees
161
Tangent
Transformed to different forms

20. Being made of 2 or more substances creating unique characteristics and properties when combine
Charles Law
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Composite material
Dividing the ultimate strength by the factor of safety

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
Stress corrosion cracking
1/2mv2 (kg x velocity(m/s))
A. sine of 90
Naperian (Natural) logarithms

22. 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
Adiabatic
45 kN
70 MPa
Purpose of P & IDs

23. 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
Charles Law
elasticity
Stress corrosion cracking
Mechanical flow diagrams

24. Potential energy (Ep)
1/2mv2 (kg x velocity(m/s))
brinell hardness test
M x g x h (kg x 9.81 m/s/s x height (m))
basic oxygen process

25. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Opposite side / hypotenuse
Isosceles triangle
Purpose of P & IDs
latent heat of evaporation (vaporation)

26. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
A solution
4.4 m/s
A / SinA = b / SinB = c / SinC
8908 kJ

27. 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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28. Work per second
Pm x A x L x N
latent heat of evaporation (vaporation)
benefits of nickel
1/2mv2 (kg x velocity(m/s))

29. PV=nRT - Boyle's law and Charle's law combined
Mechanical flow diagrams
2.3026
General gas law
One

30. 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...
10.8 m N of W
Rhombus
Purpose of P & IDs
View of a cutting plane

31. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Relative density
Naperian (Natural) logarithms
Specific heat
A. sine of 90

32. 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...
Work
Heat engines
Trapezium
Latent heat of evaporation

33. Right angle
Calorimetry
110.6 kPa
Stroke
One angle is exactly 90 degrees

34. Steam turbine bearings are usually made of...
hardness
Complementary angles
Mass
White metal and bronze

35. Kinetic energy (Ek)
A solution
1/2mv2 (kg x velocity(m/s))
dryness fraction
Ideal mechanical advantage

36. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
water equivalent
Problem solving order
Permanent and removable
10.8 m N of W

37. The ability to return to its original shape after an external force has been removed
elasticity
linear motion relationships
57.48 mm
Gamma - coefficient of superficial = 2x coefficient of linear expansion

38. Sine Rule
Problem solving order
A / SinA = b / SinB = c / SinC
70 MPa
That is supported at two ends

39. Work per power stroke (J)
effective pressure
Unified National
Pm x A x L
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

40. Negative terminal of the rectifier must always be connected to the structure that is being protected
Work
Cathodic protection system
Pm x A x L
elasticity

41. Whether a material will break under sudden impact or hard blow
A
Ammonia
Toughness
Exactly 180 degrees

42. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Rhombus
Work
A number with the necessary unit
Mass x acceleration (N)

43. Any two angles whose sum is 90
dryness fraction
26.81 m/s
Complementary angles
polytropic

44. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
Greater than 180 degrees
Permanent and removable
basic oxygen process

45. Stainless fails due to...
Chlorides
A = 4/3h2 [(square root)d/h-0.608]
Heating and cooling white cast iron at a controlled rate
26.81 m/s

46. Safe working stress is determined by...
Scalene triangle
Dividing the ultimate strength by the factor of safety
Boyle's law
To calculate power from an engine

47. A gas occupies 8.62 m3 at 1800 kPa and 26
161
Ammonia
elasticity
10.8 m N of W

48. Obtuse angle
Gamma - coefficient of superficial = 2x coefficient of linear expansion
More than 90 degrees
Complementary angles
57.48 mm

49. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
520.72 kJ/kg
Ideal mechanical advantage
Exactly 180 degrees
Gamma - coefficient of superficial = 2x coefficient of linear expansion

50. A closed plane figure bounded by straight sides
polygon
Hooke's Law
View of a cutting plane
Boyle's law