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Test your basic knowledge |
Power Engineering
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Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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study here
.
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. 1. In a right angle triangle - the sine of an acute angle is equal to...
0.0002
Opposite side / hypotenuse
Charles Law
polytropic
2. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
Purpose of material balance
Transformed to different forms
hexagon
Mechanical flow diagrams
3. 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?
Resultant
45 kN
57.48 mm
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
4. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
Ammonia
110.6 kPa
Be the same at any point in the process
Heat engines
5. A parallelogram with four equal sides
Chlorides
Rhombus
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Mechanical flow diagrams
6. 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
45 kN
Charles Law
hardness
Octagon
7. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Rhomboid
hexagon
57.48 mm
8. Area of a segment
0.0002
A = 4/3h2 [(square root)d/h-0.608]
benefits of chromium - nickel and copper in alloy steels
A
9. The temperature of saturated steam vapor at 980 kPa is...
Composite material
Mass
1/2mv2 (kg x velocity(m/s))
179.02
10. 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...
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Conditions required to produce sulphide corrosion cracking
Work
10.8 m N of W
11. Copper fails due to...
effective pressure
Ammonia
Adiabatic
Toughness
12. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
Coefficient of friction
M x g x h (kg x 9.81 m/s/s x height (m))
hexagon
A solution
13. Force - work done - power - mechanical efficiency
Problem solving order
More than 90 degrees
polygon
Scalene triangle
14. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
Greater than 180 degrees
Specific heat
45 kN
Opposite side / hypotenuse
15. Cosine rule
110.6 kPa
Exactly 180 degrees
A
Sensible heat
16. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Boyle's law
More than 90 degrees
Material balance
Continuity flow
17. Being made of 2 or more substances creating unique characteristics and properties when combine
110.6 kPa
Permanent and removable
Composite material
Charles Law
18. The most common material used in making large industrial diesel engine pistons is...
A Greek letter alpha linear
Charles Law
Cast iron
General gas law
19. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
Opposite side / hypotenuse
Isothermal
Pm x A x L x N
20. A quadrilateral with no parallel sides
Continuity flow
Ammonia
Trapezium
Unified National
21. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
White
velocity
Dividing the ultimate strength by the factor of safety
Continuity flow
22. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
A Greek letter alpha linear
velocity
Details of P & IDs
Charles Law
23. 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
0.0723
Work
A number with the necessary unit
Coefficient of friction
24. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Charles Law
Work
Scalene triangle
A = 4/3h2 [(square root)d/h-0.608]
25. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
Isosceles triangle
Trapezium
Sensible heat
Octagon
26. In the equation 0.004 + D = 0.0042 - the value of D is...
White
Gamma - coefficient of superficial = 2x coefficient of linear expansion
A. sine of 90
0.0002
27. The ability to return to its original shape after an external force has been removed
elasticity
70 MPa
As a ratio
Ideal mechanical advantage
28. The force that is equal in magnitude but opposite in direction to the resultant force is called
The equilibrant
A. sine of 90
benefits of copper
Hooke's Law
29. Sine Rule
Less than 90 degrees
Pm x A x L
A / SinA = b / SinB = c / SinC
dryness fraction
30. 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...
A Greek letter alpha linear
Latent heat of evaporation
Exactly 180 degrees
velocity
31. Ability to withstand deformation above elastic limit under compression without failure
0.0723
Unified National
Malleability
White
32. coefficient of superficial (area) expansion
26.81 m/s
Sensible heat
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Tangent
33. Acute angle
displacement
Mass x acceleration (N)
brinell hardness test
Less than 90 degrees
34. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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35. Resistance to wear - abrasion and penetration
45 kN
A / SinA = b / SinB = c / SinC
A
hardness
36. A straight line that joins 2 points or circumference
Opposite side / hypotenuse
Chord
Rhomboid
Isothermal
37. All sides equal - all angles are equal and opposite sides parallel - divided into 6 ISOSCELES triangles - each angle in an octagon is 135 - A = 4.83s2
Problem solving order
0.0002
effective pressure
Octagon
38. The most common thread used in North America on fasteners such as bolts - is the...
Output power(W)/input power(W)
Unified National
Opposite side / hypotenuse
elasticity
39. Expansion of a gas is said to be adiabatic when expansion takes place at...
Mechanical flow diagrams
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Falling temperature
Chlorides
40. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
0.89
water equivalent
As a ratio
benefits of nickel
41. 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
Continuity flow
Trapezoid
Dividing the ultimate strength by the factor of safety
42. Work per second
Pm x A x L x N
A
Work
basic oxygen process
43. Straight angle
Mass
Ammonia
Toughness
Exactly 180 degrees
44. The factor of safety is always expressed...
Trapezoid
Rhomboid
57.48 mm
As a ratio
45. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
Sensible heat
dryness fraction
Mensuration
1/2mv2 (kg x velocity(m/s))
46. When calculating the ultimate stress of a material - we should
Divide the maximum load by the original cross - sectional area
More than 90 degrees
Total heat required for change of state
Chlorides
47. 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.
Toughness
Composite material
View of a cutting plane
brinell hardness test
48. Whether a material will break under sudden impact or hard blow
Toughness
A Greek letter alpha linear
A / SinA = b / SinB = c / SinC
Chlorides
49. A automobile travels at 60 miles per hour. Expressed in metres per second - this would be equivalent to...
Value of the angle increases
26.81 m/s
Stray current corrosion
Adiabatic
50. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
That is supported at two ends
The elastic limit of the material is not exceeded
Composite material
As a ratio
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