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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. PV=nRT - Boyle's law and Charle's law combined
Octagon
Work
Cast iron
General gas law
2. Obtuse angle
Transformed to different forms
A. sine of 90
Stroke
More than 90 degrees
3. 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
water equivalent
Heat engines
Stress corrosion cracking
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
4. 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
520.72 kJ/kg
Octagon
Less than 90 degrees
Pm x A x L
5. Orthographic projection means...
View of a cutting plane
benefits of copper
57.48 mm
brinell hardness test
6. As the cosine decreases - the...
Isosceles triangle
basic oxygen process
Value of the angle increases
To calculate power from an engine
7. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
Greater than 180 degrees
Opposite side / hypotenuse
161
benefits of copper
8. Right angle
Chlorides
One angle is exactly 90 degrees
2.3026
4.4 m/s
9. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Areas of sectors (bounded by 2 radii and arc between them)
Increase
Conditions required to produce sulphide corrosion cracking
Coefficient of friction
10. Any two angles whose sum is 90
Mechanical flow diagrams
ellipse
Complementary angles
Sulfuric acid
11. Force
Pm x A x L x N
Rhomboid
A twisting or turning effect
Mass x acceleration (N)
12. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Stroke
elasticity
benefits of nickel
Continuity flow
13. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
Stray current corrosion
1/2mv2 (kg x velocity(m/s))
distance
M x g x h (kg x 9.81 m/s/s x height (m))
14. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
Cathodic protection system
Details of P & IDs
Chord
15. Micro organisms promote corrosion...
Naperian (Natural) logarithms
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
57.48 mm
ellipse
16. Velocity ratio is...
Ideal mechanical advantage
A. sine of 90
1/2mv2 (kg x velocity(m/s))
Ammonia
17. Compounds classified as salts may have the following characteristics
benefits of chromium
4.4 m/s
Pm x A x L
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
18. 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
Falling temperature
Ideal mechanical advantage
The equilibrant
Continuity flow
19. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Heat engines
General gas law
The elastic limit of the material is not exceeded
0.0723
20. Steam turbine bearings are usually made of...
General gas law
Details of P & IDs
Stress corrosion cracking
White metal and bronze
21. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
ellipse
Details of P & IDs
Problem solving order
water equivalent
22. Being made of 2 or more substances creating unique characteristics and properties when combine
Composite material
Details of P & IDs
benefits of chromium - nickel and copper in alloy steels
Dividing the ultimate strength by the factor of safety
23. coefficient of expansion
Process flow drawing
A Greek letter alpha linear
Gamma - coefficient of superficial = 2x coefficient of linear expansion
4.4 m/s
24. coefficient of superficial (area) expansion
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Adiabatic
1/2mv2 (kg x velocity(m/s))
Gamma - coefficient of superficial = 2x coefficient of linear expansion
25. P & IDs
Mass x acceleration (N)
Mechanical flow diagrams
Work
0.89
26. H2SO4 is the chemical formula for...
dryness fraction
Sulfuric acid
2.3026
As a ratio
27. Protons have a mass number of...
One
0.0723
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Stray current corrosion
28. One is the trigonometric value of...
45 kN
Purpose of material balance
A. sine of 90
Sensible heat
29. Work per power stroke (J)
Cathodic protection system
distance
110.6 kPa
Pm x A x L
30. 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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31. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
Specific heat
Hooke's Law
2.3026
Chlorides
32. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
Hooke's Law
hexagon
Rhombus
General gas law
33. Safe working stress is determined by...
Dividing the ultimate strength by the factor of safety
Heating and cooling white cast iron at a controlled rate
A Greek letter alpha linear
White metal and bronze
34. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
A Greek letter alpha linear
basic oxygen process
The specific heat of the material
Stroke
35. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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36. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
velocity
benefits of chromium
elasticity
Sulfuric acid
37. coefficient of volumetric expansion
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38. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
The specific heat of the material
Opposite side / hypotenuse
Sensible heat
39. Negative terminal of the rectifier must always be connected to the structure that is being protected
Cathodic protection system
Hooke's Law
Problem solving order
0.0723
40. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Cast iron
520.72 kJ/kg
To calculate power from an engine
A Greek letter alpha linear
41. 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
benefits of nickel
General gas law
The specific heat of the material
42. Whether a material will break under sudden impact or hard blow
Tangent
Toughness
benefits of chromium
A Greek letter alpha linear
43. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
latent heat of evaporation (vaporation)
57.48 mm
Purpose of material balance
Ammonia
44. PVn(super script n) = C
ellipse
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Less than 90 degrees
polytropic
45. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
Resultant
Mass
70 MPa
Less than 90 degrees
46. 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
Unified National
Pm x A x L x N
Relative density
displacement
47. The moment of a force about a point is...
Stress corrosion cracking
Greater than 180 degrees
A twisting or turning effect
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
48. A pinch of salt is added to a glass of water. The result is...
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Output power(W)/input power(W)
That is supported at two ends
A solution
49. 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
effective pressure
Coefficient of friction
Hooke's Law
Trapezium
50. The precise measurement of heat flow out of a system for chemical and physical processes
Calorimetry
benefits of chromium
Sulfuric acid
Under deposit corrosion - enhanced oxygen generation - contact of live organisms