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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. P & IDs
Opposite side / hypotenuse
Problem solving order
Mechanical flow diagrams
The specific heat of the material
2. Velocity ratio is...
As a ratio
Ideal mechanical advantage
Coefficient of friction
Purpose of P & IDs
3. Acute angle
70 MPa
Mass
Less than 90 degrees
Increase
4. Safe working stress is determined by...
Exactly 180 degrees
distance
Dividing the ultimate strength by the factor of safety
That is supported at two ends
5. As the cosine decreases - the...
Power
Value of the angle increases
Celsius
A = 4/3h2 [(square root)d/h-0.608]
6. Copper fails due to...
Rhombus
Ammonia
Output power(W)/input power(W)
Less than 90 degrees
7. 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
Conditions required to produce sulphide corrosion cracking
0.0723
Chlorides
Problem solving order
8. coefficient of volumetric expansion
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183
9. Work per power stroke (J)
161
As a ratio
Pm x A x L
benefits of chromium - nickel and copper in alloy steels
10. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
benefits of copper
520.72 kJ/kg
More than 90 degrees
Adiabatic
11. A quadrilateral with two parallel sides
Conditions required to produce sulphide corrosion cracking
Stray current corrosion
Trapezoid
The specific heat of the material
12. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
latent heat of evaporation (vaporation)
Exactly 180 degrees
Value of the angle increases
Power
13. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
0.89
displacement
Power
basic oxygen process
14. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
26.81 m/s
Rhombus
effective pressure
0.89
15. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
A number with the necessary unit
As a ratio
water equivalent
benefits of chromium - nickel and copper in alloy steels
16. 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
Composite material
1 cm
Malleability
17. 1. In a right angle triangle - the sine of an acute angle is equal to...
Malleability
Specific heat
Material balance
Opposite side / hypotenuse
18. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
polytropic
A number with the necessary unit
Naperian (Natural) logarithms
The equilibrant
19. 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
water equivalent
Work
hardness
20. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
distance
One
Specific heat
Tangent
21. 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
Divide the maximum load by the original cross - sectional area
Trapezium
Naperian (Natural) logarithms
Relative density
22. The most common scale in use is the...
Celsius
One
Greater than 180 degrees
dryness fraction
23. 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
benefits of copper
Stress corrosion cracking
Details of P & IDs
Ideal mechanical advantage
24. A 10 m long steel pipe when heated to increase its temperature by 85
1 cm
To calculate power from an engine
Adiabatic
Composite material
25. Change in tempereature where no heat in transferred - PV(supercript v) = C
Be the same at any point in the process
Adiabatic
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Ultimate stress/working stress
26. The force that is equal in magnitude but opposite in direction to the resultant force is called
The equilibrant
45 kN
Relative density
Specific heat
27. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
Purpose of material balance
M x g x h (kg x 9.81 m/s/s x height (m))
polygon
2.3026
28. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
Areas of sectors (bounded by 2 radii and arc between them)
velocity
Trapezoid
Isosceles triangle
29. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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30. Pythagoras' Theorem
One
A twisting or turning effect
More than 90 degrees
A
31. Whether a material will break under sudden impact or hard blow
Conditions required to produce sulphide corrosion cracking
Areas of sectors (bounded by 2 radii and arc between them)
A
Toughness
32. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Greater than 180 degrees
Pm x A x L x N
Total heat required for change of state
Latent heat of evaporation
33. The term _____ is used as a measure of the quantity of matter.
polygon
linear motion relationships
Mass
Dividing the ultimate strength by the factor of safety
34. A parallelogram with adjacent sides of unequal lengths
Rhomboid
Isothermal
velocity
26.81 m/s
35. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
Cast iron
dryness fraction
Specific heat
The equilibrant
36. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Pm x A x L
Dividing the ultimate strength by the factor of safety
To calculate power from an engine
Chlorides
37. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
A twisting or turning effect
hexagon
Stroke
White
38. Protons have a mass number of...
Exactly 180 degrees
Toughness
Work
One
39. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
Stray current corrosion
Composite material
As a ratio
57.48 mm
40. Ratio of the opposite to the adjacent side of a right- angled triangle
General gas law
Tangent
1 cm
Stroke
41. A pinch of salt is added to a glass of water. The result is...
Output power(W)/input power(W)
Value of the angle increases
Isosceles triangle
A solution
42. Sine Rule
A / SinA = b / SinB = c / SinC
45 kN
Conditions required to produce sulphide corrosion cracking
Transformed to different forms
43. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
polygon
Specific heat
1 cm
The equilibrant
44. Factor of safety
Cathodic protection system
Ultimate stress/working stress
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
10.8 m N of W
45. 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
2.3026
Power
That is supported at two ends
Charles Law
46. A straight line that joins 2 points or circumference
0.89
Complementary angles
Tangent
Chord
47. A quadrilateral with no parallel sides
Opposite side / hypotenuse
Trapezium
1 cm
linear motion relationships
48. The most common material used in making large industrial diesel engine pistons is...
Cast iron
Specific heat
Material balance
Stroke
49. Any two angles whose sum is 90
Work
Falling temperature
elasticity
Complementary angles
50. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Ultimate stress/working stress
Pm x A x L x N
The elastic limit of the material is not exceeded
520.72 kJ/kg