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Power Engineering

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 1 N weight has a kinetic energy of 1 J when its speed is...
A number with the necessary unit
Tangent
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
4.4 m/s

2. The classes of fastening devices are...
Permanent and removable
velocity
1/2mv2 (kg x velocity(m/s))
Coefficient of friction

3. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
A
As a ratio
basic oxygen process
effective pressure

4. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
M x g x h (kg x 9.81 m/s/s x height (m))
dryness fraction
Complementary angles
White

5. In the equation 0.004 + D = 0.0042 - the value of D is...
Transformed to different forms
0.0002
As a ratio
Latent heat of evaporation

6. Work per power stroke (J)
Pm x A x L
Charles Law
45 kN
Opposite side / hypotenuse

7. PVn(super script n) = C
Malleability
polytropic
View of a cutting plane
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only

8. The force that is equal in magnitude but opposite in direction to the resultant force is called
Value of the angle increases
0.0002
The equilibrant
520.72 kJ/kg

9. The most common material used in making large industrial diesel engine pistons is...
10.8 m N of W
Cast iron
Exactly 180 degrees
benefits of copper

10. When calculating the ultimate stress of a material - we should
Rhombus
Value of the angle increases
White
Divide the maximum load by the original cross - sectional area

11. 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
ellipse
Greater than 180 degrees
Process flow drawing

12. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Boyle's law
Increase
Charles Law
Heating and cooling white cast iron at a controlled rate

13. 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
Material balance
Malleability
displacement
Hooke's Law

14. A pinch of salt is added to a glass of water. The result is...
dryness fraction
A solution
brinell hardness test
A

15. Expansion of a gas is said to be adiabatic when expansion takes place at...
4.4 m/s
Purpose of material balance
Conditions required to produce sulphide corrosion cracking
Falling temperature

16. Steam turbine bearings are usually made of...
White metal and bronze
A Greek letter alpha linear
Areas of sectors (bounded by 2 radii and arc between them)
Mass x acceleration (N)

17. Cosine rule
Exactly 180 degrees
More than 90 degrees
Adiabatic
A

18. Area of a segment
1 cm
A = 4/3h2 [(square root)d/h-0.608]
elasticity
1/2mv2 (kg x velocity(m/s))

19. 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
Unified National
distance
Boyle's law

20. A closed plane figure bounded by straight sides
Ideal mechanical advantage
polygon
Relative density
benefits of copper

21. 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?
Pm x A x L
Increase
Purpose of P & IDs
45 kN

22. The ability to return to its original shape after an external force has been removed
polygon
elasticity
Mechanical flow diagrams
Ideal mechanical advantage

23. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
Boyle's law
hexagon
Purpose of material balance
Areas of sectors (bounded by 2 radii and arc between them)

24. Resistance to wear - abrasion and penetration
hardness
Be the same at any point in the process
Toughness
Isothermal

25. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
A solution
Heat engines
1 cm
Latent heat of evaporation

26. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
4.4 m/s
General gas law
Trapezoid
Sensible heat

27. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Power
Specific heat
The elastic limit of the material is not exceeded
Total heat required for change of state

28. A gas occupies 8.62 m3 at 1800 kPa and 26
Material balance
Complementary angles
161
0.89

29. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Pm x A x L
benefits of chromium
Details of P & IDs
161

30. Malleable cast iron is produced by...
Cast iron
Specific heat
Heating and cooling white cast iron at a controlled rate
distance

31. Any two angles whose sum is 90
Complementary angles
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Specific heat
A = 4/3h2 [(square root)d/h-0.608]

32. A quadrilateral with two parallel sides
Resultant
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Trapezoid
Unified National

33. Kinetic energy (Ek)
1/2mv2 (kg x velocity(m/s))
Gamma - coefficient of superficial = 2x coefficient of linear expansion
benefits of copper
velocity

34. The most common scale in use is the...
Celsius
Pm x A x L x N
Total heat required for change of state
Falling temperature

35. PV=nRT - Boyle's law and Charle's law combined
General gas law
The elastic limit of the material is not exceeded
A Greek letter alpha linear
Complementary angles

36. Ability to withstand deformation above elastic limit under compression without failure
Malleability
Pm x A x L x N
linear motion relationships
Cathodic protection system

37. Being made of 2 or more substances creating unique characteristics and properties when combine
Increase
Composite material
Relative density
benefits of chromium

38. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Work
Mechanical flow diagrams
A
Naperian (Natural) logarithms

39. Protons have a mass number of...
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
One
Heat engines
displacement

40. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
520.72 kJ/kg
Resultant
To calculate power from an engine
Trapezoid

41. One is the trigonometric value of...
Resultant
A. sine of 90
latent heat of evaporation (vaporation)
0.0723

42. The term _____ is used as a measure of the quantity of matter.
Value of the angle increases
Ultimate stress/working stress
Pm x A x L x N
Mass

43. 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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44. The moment of a force about a point is...
0.89
A = 4/3h2 [(square root)d/h-0.608]
Latent heat of evaporation
A twisting or turning effect

45. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
10.8 m N of W
A number with the necessary unit
0.89
Complementary angles

46. Acute angle
View of a cutting plane
Less than 90 degrees
Hooke's Law
Charles Law

47. coefficient of superficial (area) expansion
Gamma - coefficient of superficial = 2x coefficient of linear expansion
velocity
A / SinA = b / SinB = c / SinC
brinell hardness test

48. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
A number with the necessary unit
26.81 m/s
520.72 kJ/kg
The equilibrant

49. Work per second
Stress corrosion cracking
Pm x A x L x N
10.8 m N of W
A = 4/3h2 [(square root)d/h-0.608]

50. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
110.6 kPa
distance
A
A / SinA = b / SinB = c / SinC