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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. Work per power stroke (J)
0.0723
Specific heat
Pm x A x L
Areas of sectors (bounded by 2 radii and arc between them)
2. 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
0.0723
Chlorides
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
A / SinA = b / SinB = c / SinC
3. Ratio of the opposite to the adjacent side of a right- angled triangle
polygon
Tangent
Boyle's law
polytropic
4. A scalar quantity is one which has only magnitude and can be fully described by...
A twisting or turning effect
A number with the necessary unit
Transformed to different forms
View of a cutting plane
5. A 10 m long steel pipe when heated to increase its temperature by 85
distance
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Process flow drawing
1 cm
6. Malleable cast iron is produced by...
Heating and cooling white cast iron at a controlled rate
linear motion relationships
8908 kJ
26.81 m/s
7. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
161
White metal and bronze
benefits of chromium - nickel and copper in alloy steels
8908 kJ
8. 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
Heating and cooling white cast iron at a controlled rate
Hooke's Law
ellipse
Adiabatic
9. coefficient of volumetric expansion
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10. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
benefits of chromium
0.0002
Be the same at any point in the process
0.89
11. The factor of safety is always expressed...
velocity
As a ratio
8908 kJ
White metal and bronze
12. A gas occupies 8.62 m3 at 1800 kPa and 26
161
Power
A
Exactly 180 degrees
13. PVn(super script n) = C
polytropic
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Calorimetry
Specific heat
14. The most common material used in making large industrial diesel engine pistons is...
Permanent and removable
110.6 kPa
Cast iron
A / SinA = b / SinB = c / SinC
15. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
polygon
Unified National
4.4 m/s
Naperian (Natural) logarithms
16. Mechanical efficiency
110.6 kPa
Rhombus
Dividing the ultimate strength by the factor of safety
Output power(W)/input power(W)
17. 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
benefits of chromium
Trapezium
Ammonia
A Greek letter alpha linear
18. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
effective pressure
polytropic
Scalene triangle
Sensible heat
19. P & IDs
Greater than 180 degrees
Process flow drawing
dryness fraction
Mechanical flow diagrams
20. Reflex angle
Composite material
Greater than 180 degrees
1 cm
A Greek letter alpha linear
21. 1. In a right angle triangle - the sine of an acute angle is equal to...
Details of P & IDs
benefits of chromium - nickel and copper in alloy steels
Purpose of P & IDs
Opposite side / hypotenuse
22. One is the trigonometric value of...
Composite material
A. sine of 90
Work
Heat engines
23. Orthographic projection means...
As a ratio
View of a cutting plane
A
General gas law
24. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Material balance
2.3026
benefits of chromium
To calculate power from an engine
25. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
179.02
Stroke
benefits of copper
Areas of sectors (bounded by 2 radii and arc between them)
26. Copper fails due to...
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Ammonia
Unified National
Opposite side / hypotenuse
27. Protons have a mass number of...
basic oxygen process
179.02
One
Purpose of material balance
28. A quadrilateral with no parallel sides
Trapezium
Mechanical flow diagrams
2.3026
Tangent
29. 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...
Latent heat of evaporation
displacement
Specific heat
dryness fraction
30. A closed plane figure bounded by straight sides
0.89
latent heat of evaporation (vaporation)
Exactly 180 degrees
polygon
31. Factor of safety
Ultimate stress/working stress
Transformed to different forms
Trapezoid
Latent heat of evaporation
32. 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
View of a cutting plane
Stray current corrosion
179.02
33. Stainless fails due to...
Exactly 180 degrees
Details of P & IDs
Total heat required for change of state
Chlorides
34. A straight line that joins 2 points or circumference
1 cm
Chord
Be the same at any point in the process
water equivalent
35. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Trapezium
The elastic limit of the material is not exceeded
Increase
36. Negative terminal of the rectifier must always be connected to the structure that is being protected
A / SinA = b / SinB = c / SinC
Cathodic protection system
Output power(W)/input power(W)
One
37. 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
polygon
Continuity flow
As a ratio
hexagon
38. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
Tangent
water equivalent
10.8 m N of W
velocity
39. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Adiabatic
Relative density
elasticity
520.72 kJ/kg
40. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
A / SinA = b / SinB = c / SinC
Be the same at any point in the process
Sensible heat
520.72 kJ/kg
41. Potential energy (Ep)
M x g x h (kg x 9.81 m/s/s x height (m))
Falling temperature
ellipse
Material balance
42. Safe working stress is determined by...
Stress corrosion cracking
Dividing the ultimate strength by the factor of safety
Divide the maximum load by the original cross - sectional area
Composite material
43. When calculating the ultimate stress of a material - we should
Value of the angle increases
Divide the maximum load by the original cross - sectional area
Permanent and removable
Isothermal
44. 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
benefits of nickel
Charles Law
1 cm
1/2mv2 (kg x velocity(m/s))
45. The ability to return to its original shape after an external force has been removed
Be the same at any point in the process
One angle is exactly 90 degrees
elasticity
Charles Law
46. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
Greater than 180 degrees
57.48 mm
A twisting or turning effect
Charles Law
47. Energy can be...
latent heat of evaporation (vaporation)
Transformed to different forms
Stress corrosion cracking
Details of P & IDs
48. Kinetic energy (Ek)
57.48 mm
Sulfuric acid
1/2mv2 (kg x velocity(m/s))
One angle is exactly 90 degrees
49. The most common thread used in North America on fasteners such as bolts - is the...
Purpose of material balance
A solution
Unified National
Isosceles triangle
50. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Isothermal
The elastic limit of the material is not exceeded
0.0723
Relative density