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Power Engineering

Instructions:

Answer 50 questions in 15 minutes.
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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 term _____ is used as a measure of the quantity of matter.
One
Mass
More than 90 degrees
A twisting or turning effect

2. Copper fails due to...
Conditions required to produce sulphide corrosion cracking
A
Complementary angles
Ammonia

3. A 1 N weight has a kinetic energy of 1 J when its speed is...
4.4 m/s
polygon
Power
520.72 kJ/kg

4. Cosine rule
Rhombus
Mass
A
Mechanical flow diagrams

5. Work per second
Chord
Material balance
Pm x A x L x N
polytropic

6. 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
Stress corrosion cracking
Mechanical flow diagrams
Unified National
A twisting or turning effect

7. Steam turbine bearings are usually made of...
Greater than 180 degrees
White metal and bronze
0.89
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

8. A pinch of salt is added to a glass of water. The result is...
A solution
Ultimate stress/working stress
10.8 m N of W
A / SinA = b / SinB = c / SinC

9. PVn(super script n) = C
Mass
polytropic
Calorimetry
Divide the maximum load by the original cross - sectional area

10. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
4.4 m/s
Pm x A x L
Rhombus
Resultant

11. A parallelogram with adjacent sides of unequal lengths
Dividing the ultimate strength by the factor of safety
Calorimetry
Rhomboid
Coefficient of friction

12. The act or process of measuring
Scalene triangle
520.72 kJ/kg
Heating and cooling white cast iron at a controlled rate
Mensuration

13. Force - work done - power - mechanical efficiency
Chlorides
Problem solving order
General gas law
Heat engines

14. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Rhomboid
The elastic limit of the material is not exceeded
Output power(W)/input power(W)
8908 kJ

15. The moment of a force about a point is...
A twisting or turning effect
70 MPa
velocity
Permanent and removable

16. One is the trigonometric value of...
110.6 kPa
White
Mensuration
A. sine of 90

17. Kinetic energy (Ek)
Unified National
Less than 90 degrees
1/2mv2 (kg x velocity(m/s))
To calculate power from an engine

18. Right angle
0.89
One angle is exactly 90 degrees
hexagon
benefits of chromium - nickel and copper in alloy steels

19. 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
A twisting or turning effect
Toughness
brinell hardness test

20. u = initial velocity (m/s) - v = final velocity (m/s) - t = time (s) - s = distance (m) - a = acceleration (m/s/s) - g = acceleration due to gravity (m/s/s)
Malleability
57.48 mm
linear motion relationships
2.3026

21. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
A
basic oxygen process
Total heat required for change of state
water equivalent

22. Sine Rule
A / SinA = b / SinB = c / SinC
0.0002
dryness fraction
Charles Law

23. The precise measurement of heat flow out of a system for chemical and physical processes
Less than 90 degrees
Calorimetry
effective pressure
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only

24. 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
Purpose of material balance
Tangent
Malleability

25. coefficient of volumetric expansion

26. Of a process or change taking place at constant temperature - PV = C
A
M x g x h (kg x 9.81 m/s/s x height (m))
Isothermal
displacement

27. PFDs
Coefficient of friction
A solution
Pm x A x L x N
Process flow drawing

28. A triangle with no two sides of equal length
Scalene triangle
Output power(W)/input power(W)
Complementary angles
elasticity

29. The most common material used in making large industrial diesel engine pistons is...
4.4 m/s
Octagon
Cast iron
0.0002

30. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Heat engines
Power
Increase
Rhomboid

31. Whether a material will break under sudden impact or hard blow
Mechanical flow diagrams
Heat engines
Toughness
distance

32. Area of a segment
Calorimetry
A Greek letter alpha linear
Composite material
A = 4/3h2 [(square root)d/h-0.608]

33. 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
Mechanical flow diagrams
displacement
Stray current corrosion

34. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
Purpose of P & IDs
70 MPa
Stroke
The equilibrant

35. 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...
Cathodic protection system
elasticity
Latent heat of evaporation
0.89

36. Potential energy (Ep)
M x g x h (kg x 9.81 m/s/s x height (m))
elasticity
Dividing the ultimate strength by the factor of safety
effective pressure

37. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
dryness fraction
A
The equilibrant
Cathodic protection system

38. 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
Trapezium
Calorimetry
Hooke's Law
ellipse

39. 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...
Problem solving order
Mechanical flow diagrams
10.8 m N of W
Resultant

40. Protons have a mass number of...
A = 4/3h2 [(square root)d/h-0.608]
Resultant
Gamma - coefficient of superficial = 2x coefficient of linear expansion
One

41. A triangle with two equal sides
Toughness
Isosceles triangle
0.0723
Composite material

42. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
water equivalent
Celsius
White
Transformed to different forms

43. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Chord
latent heat of evaporation (vaporation)
Sensible heat
8908 kJ

44. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
As a ratio
Adiabatic
110.6 kPa

45. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
Complementary angles
Mensuration
70 MPa
Be the same at any point in the process

46. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Sulfuric acid
Celsius
Total heat required for change of state
Calorimetry

47. Micro organisms promote corrosion...
A Greek letter alpha linear
benefits of copper
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
A solution

48. Pythagoras' Theorem
A
26.81 m/s
Less than 90 degrees
Output power(W)/input power(W)

49. 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
Composite material
Coefficient of friction
Continuity flow
One angle is exactly 90 degrees

50. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
520.72 kJ/kg
Naperian (Natural) logarithms
Chlorides
Scalene triangle