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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. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Falling temperature
Resultant
Stroke
Less than 90 degrees

2. Right angle
Hooke's Law
One angle is exactly 90 degrees
Value of the angle increases
Work

3. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
Sensible heat
View of a cutting plane
2.3026
Purpose of material balance

4. Acute angle
Less than 90 degrees
Stroke
520.72 kJ/kg
polytropic

5. Steam turbine bearings are usually made of...
White metal and bronze
Hooke's Law
More than 90 degrees
brinell hardness test

6. Cosine rule
Unified National
White metal and bronze
Isothermal
A

7. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
hexagon
White
A Greek letter alpha linear
Chlorides

8. Copper fails due to...
The specific heat of the material
Ammonia
basic oxygen process
8908 kJ

9. Obtuse angle
Purpose of P & IDs
Output power(W)/input power(W)
More than 90 degrees
That is supported at two ends

10. A 1 N weight has a kinetic energy of 1 J when its speed is...
displacement
Falling temperature
The elastic limit of the material is not exceeded
4.4 m/s

11. Work per second
57.48 mm
Pm x A x L x N
Process flow drawing
Isosceles triangle

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

13. Micro organisms promote corrosion...
Transformed to different forms
dryness fraction
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Composite material

14. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
A number with the necessary unit
View of a cutting plane
110.6 kPa
benefits of copper

15. 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
26.81 m/s
displacement
One
Ideal mechanical advantage

16. When classifying beams - the term simple beam refers to a beam
Output power(W)/input power(W)
hardness
That is supported at two ends
A / SinA = b / SinB = c / SinC

17. Ratio of the opposite to the adjacent side of a right- angled triangle
Tangent
Exactly 180 degrees
benefits of chromium - nickel and copper in alloy steels
Mensuration

18. Malleable cast iron is produced by...
Mechanical flow diagrams
brinell hardness test
Sensible heat
Heating and cooling white cast iron at a controlled rate

19. As the cosine decreases - the...
Value of the angle increases
One angle is exactly 90 degrees
Problem solving order
Cast iron

20. coefficient of expansion
Coefficient of friction
A Greek letter alpha linear
179.02
hexagon

21. The classes of fastening devices are...
Octagon
hardness
White metal and bronze
Permanent and removable

22. 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
Ideal mechanical advantage
161
Coefficient of friction
Adiabatic

23. 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
Purpose of material balance
Relative density
Scalene triangle
Toughness

24. When calculating the ultimate stress of a material - we should
water equivalent
To calculate power from an engine
Divide the maximum load by the original cross - sectional area
1/2mv2 (kg x velocity(m/s))

25. The force that is equal in magnitude but opposite in direction to the resultant force is called
Isosceles triangle
Problem solving order
The equilibrant
161

26. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Naperian (Natural) logarithms
0.89
White
To calculate power from an engine

27. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Ultimate stress/working stress
Work
Specific heat
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

28. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
To calculate power from an engine
dryness fraction
70 MPa
Latent heat of evaporation

29. Straight angle
The elastic limit of the material is not exceeded
Exactly 180 degrees
Less than 90 degrees
effective pressure

30. Factor of safety
Value of the angle increases
70 MPa
Ultimate stress/working stress
Stress corrosion cracking

31. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
Specific heat
Work
Adiabatic
1/2mv2 (kg x velocity(m/s))

32. A quadrilateral with two parallel sides
Specific heat
Ultimate stress/working stress
Trapezoid
4.4 m/s

33. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Details of P & IDs
Process flow drawing
Heat engines
brinell hardness test

34. Change in tempereature where no heat in transferred - PV(supercript v) = C
Adiabatic
Specific heat
As a ratio
A. sine of 90

35. 1. In a right angle triangle - the sine of an acute angle is equal to...
Less than 90 degrees
0.89
hardness
Opposite side / hypotenuse

36. The most common scale in use is the...
Scalene triangle
179.02
Celsius
Calorimetry

37. 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
Conditions required to produce sulphide corrosion cracking
Rhombus
0.0723

38. The rate at which heat flow through a slab of a material does not depend on...
0.89
8908 kJ
The specific heat of the material
Conditions required to produce sulphide corrosion cracking

39. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
Greater than 180 degrees
Resultant
Exactly 180 degrees
Specific heat

40. A triangle with no two sides of equal length
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Mass x acceleration (N)
Scalene triangle
To calculate power from an engine

41. Mechanical efficiency
Chlorides
Output power(W)/input power(W)
Pm x A x L
water equivalent

42. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
57.48 mm
basic oxygen process
Ideal mechanical advantage
The equilibrant

43. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Charles Law
White
Pm x A x L x N
benefits of chromium - nickel and copper in alloy steels

44. The ability to return to its original shape after an external force has been removed
Exactly 180 degrees
elasticity
water equivalent
Pm x A x L

45. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
110.6 kPa
Stress corrosion cracking
Transformed to different forms
Less than 90 degrees

46. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
110.6 kPa
distance
To calculate power from an engine
Power

47. Force - work done - power - mechanical efficiency
Stray current corrosion
Process flow drawing
Problem solving order
Material balance

48. Whether a material will break under sudden impact or hard blow
45 kN
Latent heat of evaporation
Cast iron
Toughness

49. 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.
Trapezium
brinell hardness test
View of a cutting plane
Chord

50. Being made of 2 or more substances creating unique characteristics and properties when combine
Composite material
Pm x A x L x N
26.81 m/s
Transformed to different forms