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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 relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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2. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Falling temperature
Cathodic protection system
Total heat required for change of state
The elastic limit of the material is not exceeded
3. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
hardness
70 MPa
Problem solving order
Heat engines
4. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
benefits of nickel
Details of P & IDs
Purpose of P & IDs
2.3026
5. 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
Resultant
velocity
Isothermal
6. The classes of fastening devices are...
4.4 m/s
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Pm x A x L
Permanent and removable
7. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
A Greek letter alpha linear
Isothermal
effective pressure
0.0002
8. Pythagoras' Theorem
displacement
Value of the angle increases
Specific heat
A
9. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Material balance
White metal and bronze
1 cm
Complementary angles
10. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
57.48 mm
Material balance
Hooke's Law
Coefficient of friction
11. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
4.4 m/s
water equivalent
161
Unified National
12. A quadrilateral with no parallel sides
Be the same at any point in the process
Trapezium
White metal and bronze
57.48 mm
13. Acute angle
Dividing the ultimate strength by the factor of safety
Increase
More than 90 degrees
Less than 90 degrees
14. Energy can be...
Chord
Transformed to different forms
White
Permanent and removable
15. Malleable cast iron is produced by...
Heating and cooling white cast iron at a controlled rate
Unified National
Trapezoid
Relative density
16. Copper fails due to...
Pm x A x L
Ammonia
brinell hardness test
Trapezium
17. 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
A Greek letter alpha linear
elasticity
A solution
18. A triangle with two equal sides
Celsius
Isosceles triangle
Conditions required to produce sulphide corrosion cracking
520.72 kJ/kg
19. A straight line that joins 2 points or circumference
A twisting or turning effect
Chord
Specific heat
Pm x A x L
20. A 10 m long steel pipe when heated to increase its temperature by 85
Specific heat
More than 90 degrees
1 cm
Resultant
21. A parallelogram with adjacent sides of unequal lengths
Stroke
Process flow drawing
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Rhomboid
22. 1. In a right angle triangle - the sine of an acute angle is equal to...
Opposite side / hypotenuse
26.81 m/s
Pm x A x L
Rhomboid
23. 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...
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
The equilibrant
1 cm
10.8 m N of W
24. Kinetic energy (Ek)
Dividing the ultimate strength by the factor of safety
1/2mv2 (kg x velocity(m/s))
Be the same at any point in the process
Less than 90 degrees
25. Right angle
One angle is exactly 90 degrees
benefits of chromium
To calculate power from an engine
Latent heat of evaporation
26. Potential energy (Ep)
water equivalent
Falling temperature
M x g x h (kg x 9.81 m/s/s x height (m))
Conditions required to produce sulphide corrosion cracking
27. Whether a material will break under sudden impact or hard blow
polytropic
Mass x acceleration (N)
Toughness
0.89
28. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
The specific heat of the material
Purpose of material balance
Chord
ellipse
29. The precise measurement of heat flow out of a system for chemical and physical processes
Work
Resultant
Calorimetry
Pm x A x L
30. Micro organisms promote corrosion...
M x g x h (kg x 9.81 m/s/s x height (m))
One angle is exactly 90 degrees
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
31. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
benefits of chromium - nickel and copper in alloy steels
Sulfuric acid
To calculate power from an engine
Specific heat
32. Protons have a mass number of...
One
benefits of nickel
Permanent and removable
elasticity
33. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
distance
Stroke
57.48 mm
Specific heat
34. Work per second
Pm x A x L x N
polygon
Octagon
ellipse
35. One is the trigonometric value of...
Purpose of P & IDs
polytropic
A. sine of 90
Details of P & IDs
36. Negative terminal of the rectifier must always be connected to the structure that is being protected
One angle is exactly 90 degrees
57.48 mm
A / SinA = b / SinB = c / SinC
Cathodic protection system
37. 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
Pm x A x L x N
Process flow drawing
Value of the angle increases
38. The moment of a force about a point is...
A twisting or turning effect
Pm x A x L x N
Isothermal
Toughness
39. Mechanical efficiency
Latent heat of evaporation
Specific heat
Power
Output power(W)/input power(W)
40. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Calorimetry
26.81 m/s
8908 kJ
A twisting or turning effect
41. 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
The equilibrant
Stress corrosion cracking
White
42. Force - work done - power - mechanical efficiency
velocity
That is supported at two ends
Pm x A x L
Problem solving order
43. The act or process of measuring
Mensuration
10.8 m N of W
Mass
One
44. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Purpose of material balance
Total heat required for change of state
View of a cutting plane
Material balance
45. A scalar quantity is one which has only magnitude and can be fully described by...
Chord
A number with the necessary unit
Falling temperature
Specific heat
46. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
Mechanical flow diagrams
benefits of copper
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Celsius
47. 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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48. Work per power stroke (J)
Rhombus
Pm x A x L
2.3026
179.02
49. 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
Cast iron
benefits of chromium
8908 kJ
Trapezoid
50. A quadrilateral with two parallel sides
0.0002
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Complementary angles
Trapezoid