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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. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
Continuity flow
distance
The elastic limit of the material is not exceeded
Complementary angles
2. Expansion of a gas is said to be adiabatic when expansion takes place at...
Greater than 180 degrees
Falling temperature
The equilibrant
Areas of sectors (bounded by 2 radii and arc between them)
3. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
Relative density
Trapezoid
hexagon
elasticity
4. Energy can be...
Transformed to different forms
Mass x acceleration (N)
View of a cutting plane
A
5. 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
Permanent and removable
179.02
0.89
Relative density
6. Safe working stress is determined by...
Specific heat
161
Dividing the ultimate strength by the factor of safety
elasticity
7. H2SO4 is the chemical formula for...
Sulfuric acid
Increase
Ideal mechanical advantage
A number with the necessary unit
8. A closed plane figure bounded by straight sides
Heat engines
polygon
Purpose of P & IDs
Divide the maximum load by the original cross - sectional area
9. Stainless fails due to...
Unified National
Purpose of P & IDs
Chlorides
Stress corrosion cracking
10. 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
A = 4/3h2 [(square root)d/h-0.608]
displacement
Continuity flow
1 cm
11. The classes of fastening devices are...
Mechanical flow diagrams
Permanent and removable
Pm x A x L
One angle is exactly 90 degrees
12. Ratio of the opposite to the adjacent side of a right- angled triangle
Pm x A x L x N
Ultimate stress/working stress
0.89
Tangent
13. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
Stray current corrosion
hexagon
White
General gas law
14. A quadrilateral with no parallel sides
Trapezium
Chlorides
Unified National
Greater than 180 degrees
15. Force
White
70 MPa
Mass x acceleration (N)
Rhombus
16. One is the trigonometric value of...
520.72 kJ/kg
A. sine of 90
Stress corrosion cracking
Power
17. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
2.3026
A solution
Work
Toughness
18. 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
Less than 90 degrees
polytropic
Coefficient of friction
benefits of chromium
19. coefficient of superficial (area) expansion
Work
Increase
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Divide the maximum load by the original cross - sectional area
20. 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
Pm x A x L
Continuity flow
Falling temperature
520.72 kJ/kg
21. 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
Be the same at any point in the process
Stress corrosion cracking
Sensible heat
Composite material
22. Micro organisms promote corrosion...
Opposite side / hypotenuse
Sensible heat
Transformed to different forms
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
23. In the equation 0.004 + D = 0.0042 - the value of D is...
Gamma - coefficient of superficial = 2x coefficient of linear expansion
distance
hexagon
0.0002
24. Negative terminal of the rectifier must always be connected to the structure that is being protected
Heat engines
A / SinA = b / SinB = c / SinC
Cathodic protection system
Increase
25. Straight angle
Coefficient of friction
velocity
Exactly 180 degrees
Permanent and removable
26. 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...
Unified National
Resultant
Latent heat of evaporation
A solution
27. 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
As a ratio
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
ellipse
Increase
28. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Trapezium
Chlorides
Mass
White
29. A straight line that joins 2 points or circumference
As a ratio
Chord
1/2mv2 (kg x velocity(m/s))
Specific heat
30. Pre- construction - shows graphically the mechanical design engineer's work - during construction - proper location - reference to all equipment - after construction - training reference anddetails of process - utility and electrical systems
Purpose of P & IDs
Composite material
520.72 kJ/kg
benefits of chromium - nickel and copper in alloy steels
31. The term _____ is used as a measure of the quantity of matter.
Celsius
4.4 m/s
Mass
One angle is exactly 90 degrees
32. The most common scale in use is the...
Malleability
Transformed to different forms
Celsius
benefits of nickel
33. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
A
45 kN
Pm x A x L
34. A scalar quantity is one which has only magnitude and can be fully described by...
effective pressure
A number with the necessary unit
Unified National
linear motion relationships
35. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Details of P & IDs
benefits of nickel
10.8 m N of W
Isosceles triangle
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. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Boyle's law
520.72 kJ/kg
Continuity flow
A
38. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Mass
Scalene triangle
0.89
Heat engines
39. Velocity ratio is...
benefits of chromium
Purpose of P & IDs
General gas law
Ideal mechanical advantage
40. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
dryness fraction
Greater than 180 degrees
Specific heat
benefits of chromium
41. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
The elastic limit of the material is not exceeded
Purpose of P & IDs
effective pressure
2.3026
42. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
A = 4/3h2 [(square root)d/h-0.608]
Increase
Specific heat
Heat engines
43. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
Purpose of material balance
benefits of chromium
Coefficient of friction
To calculate power from an engine
44. The act or process of measuring
distance
Mensuration
ellipse
The specific heat of the material
45. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
A
70 MPa
polytropic
Areas of sectors (bounded by 2 radii and arc between them)
46. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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47. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Calorimetry
8908 kJ
Continuity flow
Isosceles triangle
48. When classifying beams - the term simple beam refers to a beam
That is supported at two ends
benefits of chromium - nickel and copper in alloy steels
The specific heat of the material
Mensuration
49. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Continuity flow
dryness fraction
latent heat of evaporation (vaporation)
0.89
50. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Power
Isothermal
velocity
Specific heat