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Power Engineering
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Subject
:
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. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
10.8 m N of W
Sensible heat
As a ratio
Stray current corrosion
2. Energy can be...
polytropic
Transformed to different forms
Chlorides
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
3. Safe working stress is determined by...
Ultimate stress/working stress
benefits of nickel
Exactly 180 degrees
Dividing the ultimate strength by the factor of safety
4. 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
Scalene triangle
Coefficient of friction
0.0723
A twisting or turning effect
5. coefficient of superficial (area) expansion
Gamma - coefficient of superficial = 2x coefficient of linear expansion
The specific heat of the material
Tangent
Areas of sectors (bounded by 2 radii and arc between them)
6. 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
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Greater than 180 degrees
Be the same at any point in the process
Stress corrosion cracking
7. 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
Less than 90 degrees
Stroke
Charles Law
8. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
linear motion relationships
Be the same at any point in the process
0.0723
Power
9. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
hardness
polygon
8908 kJ
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
10. Force - work done - power - mechanical efficiency
2.3026
Problem solving order
Scalene triangle
Dividing the ultimate strength by the factor of safety
11. Negative terminal of the rectifier must always be connected to the structure that is being protected
Naperian (Natural) logarithms
Cathodic protection system
Resultant
2.3026
12. Work per second
Pm x A x L x N
water equivalent
A Greek letter alpha linear
Falling temperature
13. Means that the sum of the matter leaving the plant equals the sum of the matter entering
To calculate power from an engine
basic oxygen process
Scalene triangle
Material balance
14. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
Ideal mechanical advantage
dryness fraction
Greater than 180 degrees
benefits of nickel
15. Copper fails due to...
Purpose of material balance
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Ammonia
displacement
16. The temperature of saturated steam vapor at 980 kPa is...
Resultant
The elastic limit of the material is not exceeded
Ideal mechanical advantage
179.02
17. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Details of P & IDs
Divide the maximum load by the original cross - sectional area
Cathodic protection system
Complementary angles
18. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
Toughness
Details of P & IDs
benefits of chromium - nickel and copper in alloy steels
19. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
Stray current corrosion
Adiabatic
Purpose of material balance
hexagon
20. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
Stress corrosion cracking
Cast iron
70 MPa
effective pressure
21. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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22. Micro organisms promote corrosion...
hardness
A solution
Naperian (Natural) logarithms
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
23. Change in tempereature where no heat in transferred - PV(supercript v) = C
elasticity
Adiabatic
benefits of nickel
Resultant
24. The act or process of measuring
More than 90 degrees
The elastic limit of the material is not exceeded
Hooke's Law
Mensuration
25. 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
2.3026
Tangent
Purpose of P & IDs
A number with the necessary unit
26. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
Areas of sectors (bounded by 2 radii and arc between them)
M x g x h (kg x 9.81 m/s/s x height (m))
Total heat required for change of state
The elastic limit of the material is not exceeded
27. 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
benefits of chromium
Sensible heat
Increase
Mass x acceleration (N)
28. The most common material used in making large industrial diesel engine pistons is...
Transformed to different forms
polygon
Cast iron
Heating and cooling white cast iron at a controlled rate
29. 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
Octagon
70 MPa
Exactly 180 degrees
30. Protons have a mass number of...
One
A. sine of 90
displacement
One angle is exactly 90 degrees
31. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Heat engines
Mensuration
Mass
distance
32. As the cosine decreases - the...
4.4 m/s
Malleability
Relative density
Value of the angle increases
33. Right angle
One angle is exactly 90 degrees
Sensible heat
161
Unified National
34. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
The elastic limit of the material is not exceeded
elasticity
Rhombus
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
35. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Total heat required for change of state
Cast iron
Increase
A
36. 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
A solution
To calculate power from an engine
Pm x A x L
Relative density
37. A triangle with two equal sides
0.89
A number with the necessary unit
Process flow drawing
Isosceles triangle
38. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Value of the angle increases
Charles Law
Work
A = 4/3h2 [(square root)d/h-0.608]
39. Testing metals and nonmetals of low to medium hardness. uses a ball that is pressed into material and basis calculations on the diameters of ball and indentation.
Specific heat
Isosceles triangle
161
brinell hardness test
40. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Isothermal
26.81 m/s
To calculate power from an engine
Stress corrosion cracking
41. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
To calculate power from an engine
A twisting or turning effect
White
Isothermal
42. Malleable cast iron is produced by...
polygon
Unified National
Heating and cooling white cast iron at a controlled rate
A. sine of 90
43. Obtuse angle
More than 90 degrees
Purpose of material balance
A solution
Unified National
44. The term _____ is used as a measure of the quantity of matter.
hexagon
Stress corrosion cracking
Mass
View of a cutting plane
45. 1. In a right angle triangle - the sine of an acute angle is equal to...
57.48 mm
Opposite side / hypotenuse
hardness
A twisting or turning effect
46. A quadrilateral with two parallel sides
Trapezoid
Heat engines
benefits of chromium - nickel and copper in alloy steels
That is supported at two ends
47. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
Process flow drawing
The equilibrant
benefits of chromium - nickel and copper in alloy steels
Output power(W)/input power(W)
48. Kinetic energy (Ek)
benefits of copper
distance
1/2mv2 (kg x velocity(m/s))
The elastic limit of the material is not exceeded
49. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Areas of sectors (bounded by 2 radii and arc between them)
latent heat of evaporation (vaporation)
Trapezoid
water equivalent
50. Velocity ratio is...
Ideal mechanical advantage
Pm x A x L
Increase
Cathodic protection system
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