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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. 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
Relative density
Mass x acceleration (N)
brinell hardness test
Coefficient of friction
2. When calculating the ultimate stress of a material - we should
Ultimate stress/working stress
hexagon
General gas law
Divide the maximum load by the original cross - sectional area
3. The classes of fastening devices are...
Permanent and removable
velocity
A Greek letter alpha linear
Latent heat of evaporation
4. Safe working stress is determined by...
4.4 m/s
Charles Law
Dividing the ultimate strength by the factor of safety
View of a cutting plane
5. Energy can be...
Charles Law
M x g x h (kg x 9.81 m/s/s x height (m))
Transformed to different forms
Problem solving order
6. A 1 N weight has a kinetic energy of 1 J when its speed is...
basic oxygen process
Hooke's Law
Increase
4.4 m/s
7. Straight angle
Exactly 180 degrees
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
70 MPa
Work
8. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
4.4 m/s
Heat engines
2.3026
Chord
9. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
Trapezium
Stray current corrosion
Increase
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
10. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Work
The elastic limit of the material is not exceeded
Process flow drawing
That is supported at two ends
11. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Increase
45 kN
M x g x h (kg x 9.81 m/s/s x height (m))
Naperian (Natural) logarithms
12. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
ellipse
White
A. sine of 90
Sensible heat
13. The most common scale in use is the...
Boyle's law
Permanent and removable
Celsius
0.0723
14. Orthographic projection means...
Cast iron
The specific heat of the material
10.8 m N of W
View of a cutting plane
15. Copper fails due to...
0.89
Exactly 180 degrees
Ammonia
45 kN
16. Pythagoras' Theorem
Less than 90 degrees
57.48 mm
A
Opposite side / hypotenuse
17. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Transformed to different forms
brinell hardness test
8908 kJ
Opposite side / hypotenuse
18. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
Relative density
A / SinA = b / SinB = c / SinC
hardness
effective pressure
19. A 6 m long cantilever beam carries a concentrated load of 45 kN at its free end. What is the shear force at the wall?
45 kN
The equilibrant
benefits of chromium
70 MPa
20. The act or process of measuring
Material balance
Mensuration
Sensible heat
latent heat of evaporation (vaporation)
21. Cosine rule
110.6 kPa
A solution
A
Scalene triangle
22. A parallelogram with adjacent sides of unequal lengths
Problem solving order
Rhomboid
Divide the maximum load by the original cross - sectional area
Heat engines
23. Resistance to wear - abrasion and penetration
Coefficient of friction
M x g x h (kg x 9.81 m/s/s x height (m))
Latent heat of evaporation
hardness
24. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
Relative density
A / SinA = b / SinB = c / SinC
water equivalent
25. As the cosine decreases - the...
Pm x A x L
Value of the angle increases
effective pressure
Continuity flow
26. The temperature of saturated steam vapor at 980 kPa is...
polytropic
Transformed to different forms
Stray current corrosion
179.02
27. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
elasticity
distance
Coefficient of friction
Be the same at any point in the process
28. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
polygon
One angle is exactly 90 degrees
Boyle's law
Details of P & IDs
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...
As a ratio
Areas of sectors (bounded by 2 radii and arc between them)
Latent heat of evaporation
Increase
30. 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.
Mensuration
Value of the angle increases
Conditions required to produce sulphide corrosion cracking
brinell hardness test
31. Velocity ratio is...
polygon
Value of the angle increases
Areas of sectors (bounded by 2 radii and arc between them)
Ideal mechanical advantage
32. The moment of a force about a point is...
Celsius
A twisting or turning effect
Stress corrosion cracking
Composite material
33. 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
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
One
displacement
Stress corrosion cracking
34. 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
Octagon
161
Mensuration
Continuity flow
35. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
General gas law
water equivalent
White
Opposite side / hypotenuse
36. The term _____ is used as a measure of the quantity of matter.
elasticity
Mass
Purpose of P & IDs
White metal and bronze
37. Area of a segment
View of a cutting plane
Unified National
A = 4/3h2 [(square root)d/h-0.608]
A solution
38. 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
Conditions required to produce sulphide corrosion cracking
Calorimetry
Mechanical flow diagrams
Coefficient of friction
39. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Gamma - coefficient of superficial = 2x coefficient of linear expansion
520.72 kJ/kg
Toughness
Greater than 180 degrees
40. 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
Composite material
Unified National
Conditions required to produce sulphide corrosion cracking
benefits of nickel
41. Steam turbine bearings are usually made of...
1 cm
White metal and bronze
Stress corrosion cracking
Process flow drawing
42. A pinch of salt is added to a glass of water. The result is...
polygon
0.0002
A solution
0.0723
43. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
110.6 kPa
Unified National
Areas of sectors (bounded by 2 radii and arc between them)
Mechanical flow diagrams
44. A closed plane figure bounded by straight sides
Pm x A x L x N
One
Purpose of P & IDs
polygon
45. A quadrilateral with no parallel sides
A twisting or turning effect
water equivalent
Trapezium
Latent heat of evaporation
46. The ability to return to its original shape after an external force has been removed
Permanent and removable
dryness fraction
Pm x A x L x N
elasticity
47. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Divide the maximum load by the original cross - sectional area
Calorimetry
Relative density
Power
48. 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...
1 cm
10.8 m N of W
brinell hardness test
displacement
49. Kinetic energy (Ek)
Charles Law
Heating and cooling white cast iron at a controlled rate
Stroke
1/2mv2 (kg x velocity(m/s))
50. u = initial velocity (m/s) - v = final velocity (m/s) - t = time (s) - s = distance (m) - a = acceleration (m/s/s) - g = acceleration due to gravity (m/s/s)
The specific heat of the material
linear motion relationships
brinell hardness test
hardness