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Test your basic knowledge |
Power Engineering
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
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. Potential energy (Ep)
161
M x g x h (kg x 9.81 m/s/s x height (m))
1/2mv2 (kg x velocity(m/s))
Sulfuric acid
2. 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
ellipse
Mechanical flow diagrams
The elastic limit of the material is not exceeded
White
3. Negative terminal of the rectifier must always be connected to the structure that is being protected
Cathodic protection system
Purpose of P & IDs
latent heat of evaporation (vaporation)
Sensible heat
4. Any two angles whose sum is 90
Complementary angles
Heating and cooling white cast iron at a controlled rate
Less than 90 degrees
Ultimate stress/working stress
5. PFDs
Specific heat
Output power(W)/input power(W)
Less than 90 degrees
Process flow drawing
6. Pythagoras' Theorem
Stroke
A
polygon
26.81 m/s
7. 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.
brinell hardness test
That is supported at two ends
Naperian (Natural) logarithms
70 MPa
8. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
0.89
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Resultant
Transformed to different forms
9. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
distance
Continuity flow
Chord
hexagon
10. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
Specific heat
The equilibrant
One angle is exactly 90 degrees
A / SinA = b / SinB = c / SinC
11. 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
Relative density
0.0723
A / SinA = b / SinB = c / SinC
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
12. 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
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
45 kN
Stress corrosion cracking
Unified National
13. P & IDs
Mechanical flow diagrams
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
110.6 kPa
Cathodic protection system
14. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
hexagon
Complementary angles
Total heat required for change of state
Work
15. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
Sensible heat
4.4 m/s
Falling temperature
Octagon
16. Obtuse angle
Ultimate stress/working stress
More than 90 degrees
linear motion relationships
Power
17. A quadrilateral with two parallel sides
Trapezoid
Permanent and removable
Pm x A x L
The specific heat of the material
18. A triangle with two equal sides
effective pressure
Chord
Isosceles triangle
That is supported at two ends
19. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
A twisting or turning effect
basic oxygen process
benefits of copper
Trapezium
20. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
Areas of sectors (bounded by 2 radii and arc between them)
57.48 mm
Celsius
velocity
21. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
hardness
To calculate power from an engine
Exactly 180 degrees
Details of P & IDs
22. 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
Conditions required to produce sulphide corrosion cracking
polygon
Isothermal
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
23. Ratio of the opposite to the adjacent side of a right- angled triangle
Mensuration
latent heat of evaporation (vaporation)
Tangent
Celsius
24. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
Ammonia
57.48 mm
Unified National
25. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Power
View of a cutting plane
Charles Law
Isothermal
26. 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)
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Mechanical flow diagrams
linear motion relationships
A. sine of 90
27. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Ideal mechanical advantage
0.0723
Process flow drawing
8908 kJ
28. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
520.72 kJ/kg
Cast iron
To calculate power from an engine
Ultimate stress/working stress
29. In a pipe if no fluid is added or removed - flow must remain constant - due to the product of area and velocity being constant - flow must be the same going in as coming out of pipe
Continuity flow
Dividing the ultimate strength by the factor of safety
Chlorides
Octagon
30. The classes of fastening devices are...
hexagon
ellipse
Permanent and removable
Coefficient of friction
31. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Composite material
Increase
Mensuration
0.89
32. Work per power stroke (J)
Conditions required to produce sulphide corrosion cracking
0.0723
latent heat of evaporation (vaporation)
Pm x A x L
33. Mechanical efficiency
Rhomboid
Output power(W)/input power(W)
A number with the necessary unit
Less than 90 degrees
34. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Specific heat
Purpose of P & IDs
brinell hardness test
White
35. Reflex angle
1/2mv2 (kg x velocity(m/s))
View of a cutting plane
benefits of copper
Greater than 180 degrees
36. A parallelogram with four equal sides
Power
520.72 kJ/kg
8908 kJ
Rhombus
37. A 10 m long steel pipe when heated to increase its temperature by 85
1 cm
Value of the angle increases
A solution
Divide the maximum load by the original cross - sectional area
38. Resistance to wear - abrasion and penetration
Boyle's law
Opposite side / hypotenuse
Malleability
hardness
39. When classifying beams - the term simple beam refers to a beam
More than 90 degrees
Cast iron
Complementary angles
That is supported at two ends
40. 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
Coefficient of friction
Ideal mechanical advantage
1 cm
The elastic limit of the material is not exceeded
41. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
2.3026
Resultant
The elastic limit of the material is not exceeded
White
42. Right angle
Specific heat
A twisting or turning effect
Cathodic protection system
One angle is exactly 90 degrees
43. The factor of safety is always expressed...
As a ratio
More than 90 degrees
A twisting or turning effect
Cathodic protection system
44. Sine Rule
110.6 kPa
Toughness
Isosceles triangle
A / SinA = b / SinB = c / SinC
45. 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...
Greater than 180 degrees
10.8 m N of W
110.6 kPa
Pm x A x L
46. Force
2.3026
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Mass x acceleration (N)
As a ratio
47. 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...
Latent heat of evaporation
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Be the same at any point in the process
Relative density
48. 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
Purpose of P & IDs
Toughness
Divide the maximum load by the original cross - sectional area
1 cm
49. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Problem solving order
Heat engines
0.89
Naperian (Natural) logarithms
50. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
Dividing the ultimate strength by the factor of safety
benefits of chromium - nickel and copper in alloy steels
Trapezoid
Stray current corrosion