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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. Mechanical efficiency
Output power(W)/input power(W)
Sulfuric acid
520.72 kJ/kg
Ideal mechanical advantage

2. The force that is equal in magnitude but opposite in direction to the resultant force is called
Isothermal
The equilibrant
To calculate power from an engine
Details of P & IDs

3. 1. In a right angle triangle - the sine of an acute angle is equal to...
polygon
Opposite side / hypotenuse
Cathodic protection system
Mass x acceleration (N)

4. Acute angle
Trapezoid
A
Less than 90 degrees
A Greek letter alpha linear

5. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Ultimate stress/working stress
The elastic limit of the material is not exceeded
Celsius
4.4 m/s

6. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
Chord
White metal and bronze
Areas of sectors (bounded by 2 radii and arc between them)
Specific heat

7. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
benefits of chromium
Conditions required to produce sulphide corrosion cracking
To calculate power from an engine
One

8. Reflex angle
Rhombus
Malleability
Greater than 180 degrees
Stray current corrosion

9. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Chord
Naperian (Natural) logarithms
Tangent
Complementary angles

10. 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...
Total heat required for change of state
Transformed to different forms
10.8 m N of W
45 kN

11. One is the trigonometric value of...
Dividing the ultimate strength by the factor of safety
A. sine of 90
Trapezium
A twisting or turning effect

12. 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...
520.72 kJ/kg
Latent heat of evaporation
Problem solving order
Under deposit corrosion - enhanced oxygen generation - contact of live organisms

13. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
Specific heat
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Heating and cooling white cast iron at a controlled rate
2.3026

14. The term _____ is used as a measure of the quantity of matter.
Permanent and removable
The equilibrant
Mass
Problem solving order

15. 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
distance
Continuity flow
Calorimetry

16. Potential energy (Ep)
As a ratio
Scalene triangle
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
M x g x h (kg x 9.81 m/s/s x height (m))

17. The rate at which heat flow through a slab of a material does not depend on...
The specific heat of the material
A twisting or turning effect
161
ellipse

18. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
Stroke
water equivalent
Output power(W)/input power(W)
White metal and bronze

19. The precise measurement of heat flow out of a system for chemical and physical processes
Coefficient of friction
8908 kJ
Calorimetry
linear motion relationships

20. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
0.89
To calculate power from an engine
Greater than 180 degrees
110.6 kPa

21. A closed plane figure bounded by straight sides
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
8908 kJ
A
polygon

22. Moist hydrogen sulphide environment - hydrogen sulphide must be present - water - even trace amount - high strength steel - steel must be under tensile stress - either applied or residual
Conditions required to produce sulphide corrosion cracking
Dividing the ultimate strength by the factor of safety
To calculate power from an engine
161

23. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Rhomboid
Tangent
Increase
Cast iron

24. Of a process or change taking place at constant temperature - PV = C
As a ratio
Cast iron
View of a cutting plane
Isothermal

25. 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
polygon
Continuity flow
Rhombus
57.48 mm

26. A quadrilateral with two parallel sides
Trapezoid
White metal and bronze
A = 4/3h2 [(square root)d/h-0.608]
Opposite side / hypotenuse

27. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
dryness fraction
As a ratio
4.4 m/s
Mass

28. 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?
benefits of chromium - nickel and copper in alloy steels
45 kN
Details of P & IDs
basic oxygen process

29. In the equation 0.004 + D = 0.0042 - the value of D is...
A
Scalene triangle
Coefficient of friction
0.0002

30. Ability to withstand deformation above elastic limit under compression without failure
Malleability
Heating and cooling white cast iron at a controlled rate
Stroke
Divide the maximum load by the original cross - sectional area

31. coefficient of expansion
Less than 90 degrees
Pm x A x L
1 cm
A Greek letter alpha linear

32. Velocity ratio is...
Octagon
2.3026
linear motion relationships
Ideal mechanical advantage

33. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
110.6 kPa
0.0723
Purpose of P & IDs
White

34. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Transformed to different forms
velocity
dryness fraction
Details of P & IDs

35. The most common scale in use is the...
Celsius
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Cast iron
Stress corrosion cracking

36. Change in tempereature where no heat in transferred - PV(supercript v) = C
Increase
Adiabatic
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Falling temperature

37. A automobile travels at 60 miles per hour. Expressed in metres per second - this would be equivalent to...
26.81 m/s
linear motion relationships
Output power(W)/input power(W)
brinell hardness test

38. The ability to return to its original shape after an external force has been removed
elasticity
ellipse
Mensuration
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue

39. Right angle
Octagon
One angle is exactly 90 degrees
Trapezium
Isosceles triangle

40. PFDs
linear motion relationships
polytropic
110.6 kPa
Process flow drawing

41. 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
Specific heat
displacement
Rhomboid
Naperian (Natural) logarithms

42. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Material balance
ellipse
Be the same at any point in the process
To calculate power from an engine

43. Orthographic projection means...
View of a cutting plane
Naperian (Natural) logarithms
Power
Problem solving order

44. A 1 N weight has a kinetic energy of 1 J when its speed is...
Permanent and removable
Continuity flow
4.4 m/s
1/2mv2 (kg x velocity(m/s))

45. Ratio of the opposite to the adjacent side of a right- angled triangle
Tangent
Divide the maximum load by the original cross - sectional area
Conditions required to produce sulphide corrosion cracking
Output power(W)/input power(W)

46. 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
Specific heat
Celsius
M x g x h (kg x 9.81 m/s/s x height (m))
Purpose of P & IDs

47. Force
hexagon
Power
Toughness
Mass x acceleration (N)

48. 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.
Specific heat
brinell hardness test
Boyle's law
Stroke

49. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
Permanent and removable
benefits of copper
Mass
Charles Law

50. A 10 m long steel pipe when heated to increase its temperature by 85
1 cm
Sensible heat
Octagon
brinell hardness test