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Power 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. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
Celsius
2.3026
As a ratio
One angle is exactly 90 degrees

2. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
Divide the maximum load by the original cross - sectional area
water equivalent
elasticity

3. The precise measurement of heat flow out of a system for chemical and physical processes
Coefficient of friction
Ideal mechanical advantage
0.0002
Calorimetry

4. 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
Increase
View of a cutting plane
White metal and bronze
Octagon

5. The temperature of saturated steam vapor at 980 kPa is...
Work
161
179.02
Specific heat

6. Steam turbine bearings are usually made of...
ellipse
Sulfuric acid
White metal and bronze
Sensible heat

7. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
Power
Output power(W)/input power(W)
57.48 mm
dryness fraction

8. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
velocity
Pm x A x L
ellipse
effective pressure

9. 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
displacement
Permanent and removable
Stress corrosion cracking
linear motion relationships

10. In the equation 0.004 + D = 0.0042 - the value of D is...
Power
Mensuration
0.0002
More than 90 degrees

11. Is the required to change a unit mass from a gas to liquid or liquid to a gas
179.02
Rhombus
That is supported at two ends
latent heat of evaporation (vaporation)

12. Force - work done - power - mechanical efficiency
Problem solving order
Power
benefits of nickel
A

13. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
A number with the necessary unit
Pm x A x L x N
520.72 kJ/kg
benefits of chromium - nickel and copper in alloy steels

14. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
Specific heat
polygon
Mass x acceleration (N)
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only

15. H2SO4 is the chemical formula for...
Sulfuric acid
Ideal mechanical advantage
Composite material
Stray current corrosion

16. Velocity ratio is...
70 MPa
displacement
Less than 90 degrees
Ideal mechanical advantage

17. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
More than 90 degrees
Ammonia
velocity
Sulfuric acid

18. Micro organisms promote corrosion...
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Permanent and removable
Be the same at any point in the process
Isosceles triangle

19. The ability to return to its original shape after an external force has been removed
White
elasticity
Continuity flow
179.02

20. 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...
White metal and bronze
Charles Law
10.8 m N of W
Power

21. Force
More than 90 degrees
Mass x acceleration (N)
Output power(W)/input power(W)
The elastic limit of the material is not exceeded

22. 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
70 MPa
A / SinA = b / SinB = c / SinC
Specific heat

23. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
1 cm
Heat engines
hardness
Greater than 180 degrees

24. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Hooke's Law
Malleability
520.72 kJ/kg
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

25. Safe working stress is determined by...
Permanent and removable
Dividing the ultimate strength by the factor of safety
Greater than 180 degrees
Latent heat of evaporation

26. As the cosine decreases - the...
Material balance
Unified National
Value of the angle increases
A

27. coefficient of volumetric expansion

28. When calculating the ultimate stress of a material - we should
A = 4/3h2 [(square root)d/h-0.608]
Rhombus
water equivalent
Divide the maximum load by the original cross - sectional area

29. Cosine rule
Power
A
Problem solving order
Complementary angles

30. Orthographic projection means...
Cast iron
View of a cutting plane
polygon
One

31. 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?
White metal and bronze
45 kN
Tangent
Gamma - coefficient of superficial = 2x coefficient of linear expansion

32. Work per power stroke (J)
White metal and bronze
1 cm
brinell hardness test
Pm x A x L

33. Copper fails due to...
Ammonia
That is supported at two ends
Cast iron
Hooke's Law

34. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Increase
Process flow drawing
Toughness
basic oxygen process

35. Compounds classified as salts may have the following characteristics
Problem solving order
latent heat of evaporation (vaporation)
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Latent heat of evaporation

36. Energy can be...
45 kN
polygon
benefits of nickel
Transformed to different forms

37. Obtuse angle
0.0002
Chord
Naperian (Natural) logarithms
More than 90 degrees

38. Malleable cast iron is produced by...
benefits of copper
Adiabatic
Heating and cooling white cast iron at a controlled rate
A. sine of 90

39. Work per second
Pm x A x L x N
A number with the necessary unit
A
Pm x A x L

40. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
Permanent and removable
57.48 mm
Resultant
hardness

41. Kinetic energy (Ek)
linear motion relationships
velocity
1/2mv2 (kg x velocity(m/s))
The elastic limit of the material is not exceeded

42. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Details of P & IDs
polytropic
Total heat required for change of state
Chlorides

43. 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
Resultant
Relative density
Material balance
Stress corrosion cracking

44. One is the trigonometric value of...
A. sine of 90
Relative density
Dividing the ultimate strength by the factor of safety
Details of P & IDs

45. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
benefits of copper
Output power(W)/input power(W)
To calculate power from an engine
benefits of chromium

46. A parallelogram with adjacent sides of unequal lengths
Rhomboid
Stray current corrosion
Sensible heat
basic oxygen process

47. Right angle
linear motion relationships
Celsius
One angle is exactly 90 degrees
Be the same at any point in the process

48. A closed plane figure bounded by straight sides
Ideal mechanical advantage
Mass x acceleration (N)
polygon
General gas law

49. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.

50. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
8908 kJ
Mechanical flow diagrams
velocity
Transformed to different forms