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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. PVn(super script n) = C
latent heat of evaporation (vaporation)
Stress corrosion cracking
polytropic
A. sine of 90
2. Refers to change in the position of the body - relative to some reference point - not concerned with actual distance traveled - a vector quantity with magnitude and direction
0.89
White metal and bronze
displacement
M x g x h (kg x 9.81 m/s/s x height (m))
3. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Increase
Mechanical flow diagrams
Heating and cooling white cast iron at a controlled rate
ellipse
4. A straight line that joins 2 points or circumference
Total heat required for change of state
520.72 kJ/kg
Opposite side / hypotenuse
Chord
5. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
57.48 mm
General gas law
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Purpose of P & IDs
6. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
8908 kJ
Complementary angles
Purpose of P & IDs
Chlorides
7. A 10 m long steel pipe when heated to increase its temperature by 85
A
Octagon
Isosceles triangle
1 cm
8. coefficient of volumetric expansion
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9. Energy can be...
Relative density
Transformed to different forms
Complementary angles
Less than 90 degrees
10. The temperature of saturated steam vapor at 980 kPa is...
dryness fraction
1 cm
179.02
The equilibrant
11. The ability to return to its original shape after an external force has been removed
The equilibrant
elasticity
A. sine of 90
Mechanical flow diagrams
12. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Material balance
The elastic limit of the material is not exceeded
Stroke
Specific heat
13. Expansion of a gas is said to be adiabatic when expansion takes place at...
Falling temperature
effective pressure
10.8 m N of W
velocity
14. 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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15. 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...
Ammonia
Mensuration
Latent heat of evaporation
Cathodic protection system
16. 1. In a right angle triangle - the sine of an acute angle is equal to...
Cathodic protection system
Opposite side / hypotenuse
Specific heat
A solution
17. A parallelogram with four equal sides
0.89
Celsius
Rhombus
4.4 m/s
18. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
0.0723
45 kN
Isothermal
Resultant
19. The moment of a force about a point is...
A twisting or turning effect
One
Scalene triangle
Areas of sectors (bounded by 2 radii and arc between them)
20. 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)
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
View of a cutting plane
Conditions required to produce sulphide corrosion cracking
21. H2SO4 is the chemical formula for...
Adiabatic
Sulfuric acid
Stress corrosion cracking
Malleability
22. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
Increase
Stroke
polygon
23. Cosine rule
1/2mv2 (kg x velocity(m/s))
Less than 90 degrees
A
Stress corrosion cracking
24. Being made of 2 or more substances creating unique characteristics and properties when combine
Composite material
The specific heat of the material
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Purpose of material balance
25. 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
A Greek letter alpha linear
hexagon
2.3026
26. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
110.6 kPa
Toughness
benefits of chromium - nickel and copper in alloy steels
Ultimate stress/working stress
27. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Transformed to different forms
Power
0.0723
Composite material
28. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
The elastic limit of the material is not exceeded
110.6 kPa
4.4 m/s
70 MPa
29. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Conditions required to produce sulphide corrosion cracking
Coefficient of friction
Value of the angle increases
Naperian (Natural) logarithms
30. Resistance to corrosion and oxidation at high temperatures - improves toughness - prevents brittleness at low temperatures - increases strength without affecting toughness - amounts range from 1-4% - high impact resistance at amounts as high as 36% -
effective pressure
Heating and cooling white cast iron at a controlled rate
benefits of nickel
Exactly 180 degrees
31. 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
Stress corrosion cracking
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Complementary angles
26.81 m/s
32. 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
Mensuration
Octagon
0.0723
hexagon
33. 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.
White
brinell hardness test
A twisting or turning effect
Rhombus
34. A automobile travels at 60 miles per hour. Expressed in metres per second - this would be equivalent to...
0.0723
Sulfuric acid
Opposite side / hypotenuse
26.81 m/s
35. A triangle with no two sides of equal length
hexagon
Scalene triangle
179.02
26.81 m/s
36. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
water equivalent
1/2mv2 (kg x velocity(m/s))
Conditions required to produce sulphide corrosion cracking
A number with the necessary unit
37. The force that is equal in magnitude but opposite in direction to the resultant force is called
Mass x acceleration (N)
Isothermal
The equilibrant
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
38. coefficient of expansion
Tangent
Unified National
A Greek letter alpha linear
10.8 m N of W
39. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
velocity
As a ratio
dryness fraction
Sensible heat
40. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.0002
A / SinA = b / SinB = c / SinC
Isothermal
0.89
41. P & IDs
A twisting or turning effect
Mechanical flow diagrams
The elastic limit of the material is not exceeded
Charles Law
42. A pinch of salt is added to a glass of water. The result is...
A solution
Octagon
Latent heat of evaporation
Tangent
43. 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
Isothermal
Material balance
Rhomboid
Relative density
44. Right angle
One angle is exactly 90 degrees
benefits of nickel
Continuity flow
Problem solving order
45. The factor of safety is always expressed...
As a ratio
latent heat of evaporation (vaporation)
Rhomboid
26.81 m/s
46. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Octagon
latent heat of evaporation (vaporation)
161
A twisting or turning effect
47. The classes of fastening devices are...
polytropic
Permanent and removable
110.6 kPa
Scalene triangle
48. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Output power(W)/input power(W)
basic oxygen process
A number with the necessary unit
Complementary angles
49. One is the trigonometric value of...
To calculate power from an engine
Divide the maximum load by the original cross - sectional area
A. sine of 90
A
50. Force
Divide the maximum load by the original cross - sectional area
Mass x acceleration (N)
White
White metal and bronze