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Test your basic knowledge |
Power Engineering
Start Test
Study First
Subject
:
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. Resists oxidation - high strength at high temperatures - increases hardness and abrasion resistance without increasing brittleness - increases response to heat treatment - increases depth of hardness penetration - at 12% chromium steel with not tarni
Stress corrosion cracking
Coefficient of friction
benefits of chromium
Latent heat of evaporation
2. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
Rhombus
Sensible heat
Hooke's Law
benefits of chromium - nickel and copper in alloy steels
3. Change in tempereature where no heat in transferred - PV(supercript v) = C
Adiabatic
Isosceles triangle
Stroke
110.6 kPa
4. Force - work done - power - mechanical efficiency
Problem solving order
Trapezoid
One angle is exactly 90 degrees
A
5. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
Dividing the ultimate strength by the factor of safety
Power
Relative density
57.48 mm
6. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Problem solving order
Total heat required for change of state
Latent heat of evaporation
Composite material
7. The most common material used in making large industrial diesel engine pistons is...
0.0002
As a ratio
Ultimate stress/working stress
Cast iron
8. A triangle with no two sides of equal length
Scalene triangle
Opposite side / hypotenuse
Cast iron
Purpose of material balance
9. 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
Naperian (Natural) logarithms
Isothermal
Trapezium
10. The most common scale in use is the...
Celsius
linear motion relationships
A number with the necessary unit
Value of the angle increases
11. Of a process or change taking place at constant temperature - PV = C
Isothermal
The elastic limit of the material is not exceeded
110.6 kPa
Complementary angles
12. Work per power stroke (J)
The elastic limit of the material is not exceeded
Pm x A x L
Work
Hooke's Law
13. Right angle
Opposite side / hypotenuse
4.4 m/s
One angle is exactly 90 degrees
distance
14. A gas occupies 8.62 m3 at 1800 kPa and 26
Octagon
Falling temperature
161
A twisting or turning effect
15. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
benefits of chromium - nickel and copper in alloy steels
45 kN
Sulfuric acid
A
16. Factor of safety
Calorimetry
Ultimate stress/working stress
Trapezoid
Isosceles triangle
17. The precise measurement of heat flow out of a system for chemical and physical processes
179.02
Toughness
Work
Calorimetry
18. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
520.72 kJ/kg
Hooke's Law
Coefficient of friction
The equilibrant
19. 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
effective pressure
Pm x A x L
Ideal mechanical advantage
Purpose of P & IDs
20. 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
One angle is exactly 90 degrees
179.02
Charles Law
ellipse
21. Obtuse angle
Sensible heat
water equivalent
More than 90 degrees
Exactly 180 degrees
22. coefficient of expansion
Chlorides
A Greek letter alpha linear
polygon
A number with the necessary unit
23. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Transformed to different forms
Details of P & IDs
benefits of chromium - nickel and copper in alloy steels
Complementary angles
24. Is the required to change a unit mass from a gas to liquid or liquid to a gas
ellipse
Purpose of material balance
Less than 90 degrees
latent heat of evaporation (vaporation)
25. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
That is supported at two ends
distance
To calculate power from an engine
Process flow drawing
26. Mechanical efficiency
57.48 mm
As a ratio
Output power(W)/input power(W)
A Greek letter alpha linear
27. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
The elastic limit of the material is not exceeded
White
Adiabatic
Sensible heat
28. As the cosine decreases - the...
Value of the angle increases
Malleability
4.4 m/s
displacement
29. 1. In a right angle triangle - the sine of an acute angle is equal to...
Process flow drawing
Opposite side / hypotenuse
Be the same at any point in the process
dryness fraction
30. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
70 MPa
Isosceles triangle
water equivalent
A twisting or turning effect
31. The classes of fastening devices are...
Permanent and removable
Hooke's Law
A / SinA = b / SinB = c / SinC
Continuity flow
32. A quadrilateral with two parallel sides
Trapezoid
One angle is exactly 90 degrees
Conditions required to produce sulphide corrosion cracking
0.0002
33. Stainless fails due to...
Chlorides
Gamma - coefficient of superficial = 2x coefficient of linear expansion
hexagon
effective pressure
34. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
Be the same at any point in the process
Stress corrosion cracking
Ideal mechanical advantage
26.81 m/s
35. A triangle with two equal sides
26.81 m/s
Isosceles triangle
110.6 kPa
White
36. A closed plane figure bounded by straight sides
polygon
Stroke
Unified National
Permanent and removable
37. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
A number with the necessary unit
Mensuration
Areas of sectors (bounded by 2 radii and arc between them)
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
38. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Toughness
Specific heat
Naperian (Natural) logarithms
Rhombus
39. Safe working stress is determined by...
0.0723
Dividing the ultimate strength by the factor of safety
Chord
57.48 mm
40. Compounds classified as salts may have the following characteristics
brinell hardness test
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Naperian (Natural) logarithms
A twisting or turning effect
41. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
Exactly 180 degrees
4.4 m/s
effective pressure
Composite material
42. 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
Work
A solution
Continuity flow
8908 kJ
43. Ratio of the opposite to the adjacent side of a right- angled triangle
Octagon
The elastic limit of the material is not exceeded
Trapezium
Tangent
44. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
179.02
Power
To calculate power from an engine
A / SinA = b / SinB = c / SinC
45. Cosine rule
161
A
That is supported at two ends
benefits of nickel
46. 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
Stress corrosion cracking
Purpose of P & IDs
displacement
A. sine of 90
47. The factor of safety is always expressed...
45 kN
As a ratio
Permanent and removable
1/2mv2 (kg x velocity(m/s))
48. Energy can be...
Transformed to different forms
Purpose of material balance
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Specific heat
49. Ability to withstand deformation above elastic limit under compression without failure
Malleability
Dividing the ultimate strength by the factor of safety
Power
As a ratio
50. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Increase
179.02
Heat engines
0.89