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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. A closed plane figure bounded by straight sides
polygon
Cathodic protection system
Relative density
Mensuration
2. Right angle
One
Ammonia
One angle is exactly 90 degrees
57.48 mm
3. The ability to return to its original shape after an external force has been removed
Falling temperature
161
Specific heat
elasticity
4. 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
Calorimetry
Details of P & IDs
ellipse
Naperian (Natural) logarithms
5. The most common scale in use is the...
Tangent
Purpose of P & IDs
Celsius
Unified National
6. Negative terminal of the rectifier must always be connected to the structure that is being protected
Total heat required for change of state
Cathodic protection system
Transformed to different forms
Pm x A x L x N
7. Pythagoras' Theorem
0.0002
Isosceles triangle
Mensuration
A
8. When calculating the ultimate stress of a material - we should
To calculate power from an engine
A = 4/3h2 [(square root)d/h-0.608]
Divide the maximum load by the original cross - sectional area
Chord
9. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Work
A twisting or turning effect
Ultimate stress/working stress
Be the same at any point in the process
10. The act or process of measuring
Hooke's Law
polygon
Isothermal
Mensuration
11. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
Cast iron
distance
velocity
Output power(W)/input power(W)
12. A quadrilateral with no parallel sides
Chord
Trapezium
Specific heat
Malleability
13. Velocity ratio is...
Ideal mechanical advantage
A number with the necessary unit
polytropic
dryness fraction
14. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
Conditions required to produce sulphide corrosion cracking
Be the same at any point in the process
520.72 kJ/kg
The equilibrant
15. Compounds classified as salts may have the following characteristics
10.8 m N of W
70 MPa
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Toughness
16. Obtuse angle
Malleability
Ideal mechanical advantage
More than 90 degrees
Charles Law
17. 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
57.48 mm
A. sine of 90
Stress corrosion cracking
Rhomboid
18. Kinetic energy (Ek)
161
Toughness
Octagon
1/2mv2 (kg x velocity(m/s))
19. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Trapezoid
Ultimate stress/working stress
Specific heat
To calculate power from an engine
20. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Ideal mechanical advantage
dryness fraction
8908 kJ
Power
21. Ratio of the opposite to the adjacent side of a right- angled triangle
Pm x A x L x N
Tangent
A
A. sine of 90
22. 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
1/2mv2 (kg x velocity(m/s))
Trapezoid
Relative density
Work
23. Being made of 2 or more substances creating unique characteristics and properties when combine
Unified National
Composite material
basic oxygen process
elasticity
24. One is the trigonometric value of...
Toughness
A. sine of 90
Stroke
water equivalent
25. Reflex angle
Greater than 180 degrees
Mechanical flow diagrams
Sulfuric acid
Dividing the ultimate strength by the factor of safety
26. 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
Coefficient of friction
White
A = 4/3h2 [(square root)d/h-0.608]
4.4 m/s
27. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
As a ratio
A number with the necessary unit
To calculate power from an engine
2.3026
28. coefficient of superficial (area) expansion
Dividing the ultimate strength by the factor of safety
26.81 m/s
benefits of nickel
Gamma - coefficient of superficial = 2x coefficient of linear expansion
29. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Purpose of material balance
latent heat of evaporation (vaporation)
2.3026
benefits of chromium - nickel and copper in alloy steels
30. The temperature of saturated steam vapor at 980 kPa is...
179.02
polygon
Power
Boyle's law
31. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Material balance
Charles Law
Increase
Mechanical flow diagrams
32. Stainless fails due to...
Unified National
Chlorides
benefits of copper
displacement
33. In the equation 0.004 + D = 0.0042 - the value of D is...
Less than 90 degrees
Trapezium
0.0002
Relative density
34. Of a process or change taking place at constant temperature - PV = C
benefits of chromium
More than 90 degrees
Isothermal
Falling temperature
35. Sine Rule
Trapezium
A / SinA = b / SinB = c / SinC
M x g x h (kg x 9.81 m/s/s x height (m))
Charles Law
36. 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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37. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
8908 kJ
To calculate power from an engine
basic oxygen process
Problem solving order
38. The factor of safety is always expressed...
As a ratio
Power
Coefficient of friction
water equivalent
39. Orthographic projection means...
Power
Be the same at any point in the process
View of a cutting plane
Divide the maximum load by the original cross - sectional area
40. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
White
Specific heat
Resultant
Boyle's law
41. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
benefits of chromium
Isothermal
Hooke's Law
distance
42. Force - work done - power - mechanical efficiency
520.72 kJ/kg
45 kN
polytropic
Problem solving order
43. coefficient of volumetric expansion
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44. Straight angle
Power
Output power(W)/input power(W)
Exactly 180 degrees
0.89
45. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Heat engines
Stress corrosion cracking
White
Less than 90 degrees
46. A scalar quantity is one which has only magnitude and can be fully described by...
Be the same at any point in the process
0.89
Complementary angles
A number with the necessary unit
47. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
A Greek letter alpha linear
Greater than 180 degrees
The elastic limit of the material is not exceeded
110.6 kPa
48. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Adiabatic
26.81 m/s
Octagon
Naperian (Natural) logarithms
49. 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)
hexagon
A. sine of 90
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
50. PFDs
Process flow drawing
2.3026
Unified National
benefits of nickel