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Power Engineering
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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. Obtuse angle
Chlorides
Cast iron
110.6 kPa
More than 90 degrees
2. H2SO4 is the chemical formula for...
linear motion relationships
To calculate power from an engine
Sulfuric acid
520.72 kJ/kg
3. Energy can be...
polytropic
Transformed to different forms
Boyle's law
Exactly 180 degrees
4. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Scalene triangle
White metal and bronze
Power
Mass
5. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Complementary angles
Naperian (Natural) logarithms
1/2mv2 (kg x velocity(m/s))
hardness
6. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
benefits of chromium
Mass
dryness fraction
0.0002
7. 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
A Greek letter alpha linear
polygon
Areas of sectors (bounded by 2 radii and arc between them)
Charles Law
8. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
Conditions required to produce sulphide corrosion cracking
Areas of sectors (bounded by 2 radii and arc between them)
Trapezoid
Cast iron
9. 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
benefits of chromium - nickel and copper in alloy steels
Octagon
Process flow drawing
Work
10. Factor of safety
Ultimate stress/working stress
One
Chord
As a ratio
11. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
Latent heat of evaporation
2.3026
A
Power
12. When calculating the ultimate stress of a material - we should
Chord
Divide the maximum load by the original cross - sectional area
520.72 kJ/kg
ellipse
13. 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
Heating and cooling white cast iron at a controlled rate
Mass
0.0723
14. Copper fails due to...
Sensible heat
Process flow drawing
Ammonia
Dividing the ultimate strength by the factor of safety
15. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
The elastic limit of the material is not exceeded
More than 90 degrees
Stray current corrosion
A number with the necessary unit
16. Pythagoras' Theorem
Stray current corrosion
A
Specific heat
Output power(W)/input power(W)
17. Ratio of the opposite to the adjacent side of a right- angled triangle
110.6 kPa
Less than 90 degrees
Tangent
Composite material
18. A straight line that joins 2 points or circumference
Dividing the ultimate strength by the factor of safety
Calorimetry
Chord
benefits of chromium - nickel and copper in alloy steels
19. 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
Purpose of P & IDs
2.3026
linear motion relationships
20. Resists oxidation - high strength at high temperatures - increases hardness and abrasion resistance without increasing brittleness - increases response to heat treatment - increases depth of hardness penetration - at 12% chromium steel with not tarni
Rhombus
Coefficient of friction
benefits of chromium
A. sine of 90
21. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
benefits of chromium - nickel and copper in alloy steels
Work
520.72 kJ/kg
Divide the maximum load by the original cross - sectional area
22. Malleable cast iron is produced by...
Heating and cooling white cast iron at a controlled rate
Malleability
displacement
One
23. A quadrilateral with two parallel sides
Trapezoid
0.89
Naperian (Natural) logarithms
Work
24. The act or process of measuring
hardness
0.0002
Mensuration
Ultimate stress/working stress
25. Mechanical efficiency
Output power(W)/input power(W)
General gas law
Opposite side / hypotenuse
latent heat of evaporation (vaporation)
26. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Mechanical flow diagrams
Increase
Trapezium
Areas of sectors (bounded by 2 radii and arc between them)
27. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
Areas of sectors (bounded by 2 radii and arc between them)
Mass x acceleration (N)
Specific heat
water equivalent
28. Straight angle
Conditions required to produce sulphide corrosion cracking
57.48 mm
Exactly 180 degrees
water equivalent
29. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
Hooke's Law
Isosceles triangle
Heat engines
Be the same at any point in the process
30. Whether a material will break under sudden impact or hard blow
A / SinA = b / SinB = c / SinC
Toughness
A
Octagon
31. Being made of 2 or more substances creating unique characteristics and properties when combine
Rhombus
General gas law
Composite material
Increase
32. Right angle
dryness fraction
Conditions required to produce sulphide corrosion cracking
70 MPa
One angle is exactly 90 degrees
33. A parallelogram with adjacent sides of unequal lengths
Rhombus
The equilibrant
Charles Law
Rhomboid
34. A 1 N weight has a kinetic energy of 1 J when its speed is...
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
4.4 m/s
Pm x A x L
Conditions required to produce sulphide corrosion cracking
35. 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.
Pm x A x L x N
brinell hardness test
Opposite side / hypotenuse
linear motion relationships
36. 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
polytropic
A
Chlorides
displacement
37. Velocity ratio is...
1/2mv2 (kg x velocity(m/s))
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
161
Ideal mechanical advantage
38. The temperature of saturated steam vapor at 980 kPa is...
179.02
Work
Toughness
Rhomboid
39. A 10 m long steel pipe when heated to increase its temperature by 85
1 cm
Falling temperature
General gas law
Mass x acceleration (N)
40. 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
polytropic
0.0723
0.0002
Sensible heat
41. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Heating and cooling white cast iron at a controlled rate
4.4 m/s
0.89
Be the same at any point in the process
42. The most common material used in making large industrial diesel engine pistons is...
Cast iron
A Greek letter alpha linear
Celsius
distance
43. The term _____ is used as a measure of the quantity of matter.
Conditions required to produce sulphide corrosion cracking
Ultimate stress/working stress
Total heat required for change of state
Mass
44. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Transformed to different forms
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Hooke's Law
White
45. Resistance to wear - abrasion and penetration
Falling temperature
Sulfuric acid
Gamma - coefficient of superficial = 2x coefficient of linear expansion
hardness
46. The force that is equal in magnitude but opposite in direction to the resultant force is called
Purpose of P & IDs
White metal and bronze
The equilibrant
latent heat of evaporation (vaporation)
47. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
A Greek letter alpha linear
Specific heat
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Be the same at any point in the process
48. Negative terminal of the rectifier must always be connected to the structure that is being protected
basic oxygen process
8908 kJ
Cathodic protection system
White
49. Kinetic energy (Ek)
Charles Law
Tangent
1/2mv2 (kg x velocity(m/s))
displacement
50. A triangle with two equal sides
Isosceles triangle
Power
Problem solving order
Resultant
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