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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. Whether a material will break under sudden impact or hard blow
Ultimate stress/working stress
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Toughness
benefits of nickel
2. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
The specific heat of the material
Total heat required for change of state
520.72 kJ/kg
Specific heat
3. When calculating the ultimate stress of a material - we should
Divide the maximum load by the original cross - sectional area
Toughness
Heating and cooling white cast iron at a controlled rate
Trapezium
4. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
velocity
Sensible heat
Power
Isothermal
5. Orthographic projection means...
Scalene triangle
Chord
That is supported at two ends
View of a cutting plane
6. The force that is equal in magnitude but opposite in direction to the resultant force is called
benefits of nickel
Mechanical flow diagrams
The equilibrant
Hooke's Law
7. 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
benefits of copper
Relative density
A = 4/3h2 [(square root)d/h-0.608]
Sulfuric acid
8. 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...
Boyle's law
Latent heat of evaporation
Rhomboid
520.72 kJ/kg
9. PVn(super script n) = C
One angle is exactly 90 degrees
polytropic
Stroke
Coefficient of friction
10. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
Stroke
57.48 mm
Areas of sectors (bounded by 2 radii and arc between them)
Mass x acceleration (N)
11. When classifying beams - the term simple beam refers to a beam
That is supported at two ends
Unified National
2.3026
Latent heat of evaporation
12. 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
Complementary angles
brinell hardness test
Cathodic protection system
13. Velocity ratio is...
Ideal mechanical advantage
ellipse
Stray current corrosion
Pm x A x L x N
14. Ability to withstand deformation above elastic limit under compression without failure
Rhombus
hexagon
Heat engines
Malleability
15. coefficient of expansion
A Greek letter alpha linear
White
polygon
Permanent and removable
16. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
70 MPa
Increase
As a ratio
Celsius
17. A triangle with no two sides of equal length
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Scalene triangle
Chord
161
18. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
Details of P & IDs
The elastic limit of the material is not exceeded
velocity
19. Straight angle
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
0.0723
Total heat required for change of state
Exactly 180 degrees
20. Force - work done - power - mechanical efficiency
Pm x A x L
That is supported at two ends
2.3026
Problem solving order
21. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
White metal and bronze
Cast iron
Chord
Stray current corrosion
22. 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
Octagon
Be the same at any point in the process
M x g x h (kg x 9.81 m/s/s x height (m))
23. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Increase
Areas of sectors (bounded by 2 radii and arc between them)
displacement
hardness
24. A closed plane figure bounded by straight sides
polygon
8908 kJ
Rhombus
Celsius
25. Sine Rule
distance
Work
Resultant
A / SinA = b / SinB = c / SinC
26. 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
2.3026
Relative density
Coefficient of friction
27. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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28. 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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29. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
distance
latent heat of evaporation (vaporation)
displacement
Details of P & IDs
30. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
Rhomboid
Purpose of material balance
M x g x h (kg x 9.81 m/s/s x height (m))
Be the same at any point in the process
31. A parallelogram with adjacent sides of unequal lengths
Falling temperature
Rhomboid
View of a cutting plane
Pm x A x L
32. 1. In a right angle triangle - the sine of an acute angle is equal to...
White
Total heat required for change of state
Opposite side / hypotenuse
benefits of copper
33. Work per second
Purpose of material balance
Mass x acceleration (N)
Pm x A x L x N
Details of P & IDs
34. 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
polygon
Octagon
The equilibrant
Total heat required for change of state
35. Of a process or change taking place at constant temperature - PV = C
Total heat required for change of state
A
Coefficient of friction
Isothermal
36. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
hardness
Relative density
White
Material balance
37. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
179.02
Be the same at any point in the process
Celsius
Cast iron
38. A 10 m long steel pipe when heated to increase its temperature by 85
1 cm
dryness fraction
Sensible heat
Conditions required to produce sulphide corrosion cracking
39. Copper fails due to...
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Mensuration
Ammonia
70 MPa
40. 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
Boyle's law
Adiabatic
Purpose of P & IDs
hexagon
41. Pythagoras' Theorem
A
effective pressure
Problem solving order
Ultimate stress/working stress
42. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Process flow drawing
Sensible heat
basic oxygen process
Coefficient of friction
43. A gas occupies 8.62 m3 at 1800 kPa and 26
polytropic
General gas law
161
latent heat of evaporation (vaporation)
44. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Power
0.89
M x g x h (kg x 9.81 m/s/s x height (m))
0.0723
45. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
2.3026
As a ratio
water equivalent
Permanent and removable
46. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Total heat required for change of state
Coefficient of friction
1 cm
Latent heat of evaporation
47. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
M x g x h (kg x 9.81 m/s/s x height (m))
velocity
benefits of chromium
Dividing the ultimate strength by the factor of safety
48. In the equation 0.004 + D = 0.0042 - the value of D is...
26.81 m/s
0.0002
Chord
70 MPa
49. A quadrilateral with no parallel sides
To calculate power from an engine
polytropic
Trapezium
Chord
50. As the cosine decreases - the...
Value of the angle increases
Tangent
Problem solving order
Ammonia
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