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Power Engineering
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Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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study here
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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. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
White metal and bronze
Total heat required for change of state
Sensible heat
Material balance
2. Orthographic projection means...
Heating and cooling white cast iron at a controlled rate
520.72 kJ/kg
One
View of a cutting plane
3. The act or process of measuring
General gas law
Sensible heat
Mensuration
1 cm
4. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
0.0002
26.81 m/s
57.48 mm
elasticity
5. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Trapezium
Specific heat
basic oxygen process
Work
6. The precise measurement of heat flow out of a system for chemical and physical processes
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Calorimetry
Scalene triangle
Latent heat of evaporation
7. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Heat engines
basic oxygen process
hexagon
Scalene triangle
8. Expansion of a gas is said to be adiabatic when expansion takes place at...
Scalene triangle
Heat engines
Falling temperature
Details of P & IDs
9. Area of a segment
A = 4/3h2 [(square root)d/h-0.608]
70 MPa
Dividing the ultimate strength by the factor of safety
To calculate power from an engine
10. As the cosine decreases - the...
2.3026
Value of the angle increases
179.02
A Greek letter alpha linear
11. The factor of safety is always expressed...
As a ratio
Heat engines
Rhomboid
basic oxygen process
12. 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
0.0723
2.3026
Value of the angle increases
Areas of sectors (bounded by 2 radii and arc between them)
13. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
hardness
velocity
Stress corrosion cracking
Composite material
14. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
A Greek letter alpha linear
A number with the necessary unit
dryness fraction
Sensible heat
15. Factor of safety
A number with the necessary unit
Be the same at any point in the process
Ultimate stress/working stress
Heating and cooling white cast iron at a controlled rate
16. 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
161
hardness
Charles Law
Trapezoid
17. Stainless fails due to...
4.4 m/s
Composite material
Chlorides
Relative density
18. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
8908 kJ
179.02
A number with the necessary unit
0.0723
19. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
velocity
basic oxygen process
Resultant
Material balance
20. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
Ideal mechanical advantage
Scalene triangle
Heat engines
benefits of chromium - nickel and copper in alloy steels
21. A quadrilateral with two parallel sides
water equivalent
Trapezoid
As a ratio
Greater than 180 degrees
22. Resistance to wear - abrasion and penetration
M x g x h (kg x 9.81 m/s/s x height (m))
benefits of nickel
hardness
Dividing the ultimate strength by the factor of safety
23. Copper fails due to...
0.89
Ammonia
Trapezium
Mechanical flow diagrams
24. Is the required to change a unit mass from a gas to liquid or liquid to a gas
elasticity
Exactly 180 degrees
latent heat of evaporation (vaporation)
distance
25. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
White metal and bronze
Areas of sectors (bounded by 2 radii and arc between them)
Be the same at any point in the process
Boyle's law
26. Protons have a mass number of...
Octagon
One
2.3026
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
27. 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
A
Purpose of P & IDs
8908 kJ
Stray current corrosion
28. Force - work done - power - mechanical efficiency
Chord
45 kN
The elastic limit of the material is not exceeded
Problem solving order
29. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Dividing the ultimate strength by the factor of safety
Stray current corrosion
Naperian (Natural) logarithms
Details of P & IDs
30. Ability to withstand deformation above elastic limit under compression without failure
Problem solving order
Stroke
Malleability
As a ratio
31. 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
57.48 mm
Isothermal
Conditions required to produce sulphide corrosion cracking
A = 4/3h2 [(square root)d/h-0.608]
32. In the equation 0.004 + D = 0.0042 - the value of D is...
0.0002
benefits of copper
Naperian (Natural) logarithms
Purpose of P & IDs
33. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Ideal mechanical advantage
8908 kJ
Naperian (Natural) logarithms
520.72 kJ/kg
34. A gas occupies 8.62 m3 at 1800 kPa and 26
Heat engines
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
161
1 cm
35. The classes of fastening devices are...
Charles Law
Exactly 180 degrees
Scalene triangle
Permanent and removable
36. 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% -
Naperian (Natural) logarithms
benefits of nickel
Chlorides
latent heat of evaporation (vaporation)
37. Steam turbine bearings are usually made of...
Divide the maximum load by the original cross - sectional area
Mass x acceleration (N)
White metal and bronze
latent heat of evaporation (vaporation)
38. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
2.3026
1 cm
water equivalent
hexagon
39. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
Hooke's Law
water equivalent
Coefficient of friction
Calorimetry
40. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
Specific heat
Divide the maximum load by the original cross - sectional area
latent heat of evaporation (vaporation)
Greater than 180 degrees
41. A 10 m long steel pipe when heated to increase its temperature by 85
Complementary angles
benefits of chromium - nickel and copper in alloy steels
0.89
1 cm
42. A closed plane figure bounded by straight sides
One
polygon
Conditions required to produce sulphide corrosion cracking
A
43. 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...
More than 90 degrees
Boyle's law
Latent heat of evaporation
To calculate power from an engine
44. The moment of a force about a point is...
Falling temperature
Process flow drawing
A twisting or turning effect
To calculate power from an engine
45. 1. In a right angle triangle - the sine of an acute angle is equal to...
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Hooke's Law
Opposite side / hypotenuse
Cathodic protection system
46. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
70 MPa
Pm x A x L
White
velocity
47. The ability to return to its original shape after an external force has been removed
elasticity
Naperian (Natural) logarithms
A solution
water equivalent
48. 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
hardness
70 MPa
Cathodic protection system
49. Velocity ratio is...
Ideal mechanical advantage
Rhombus
One angle is exactly 90 degrees
A = 4/3h2 [(square root)d/h-0.608]
50. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Cathodic protection system
0.89
White
Cast iron
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