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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. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
Mass
70 MPa
More than 90 degrees
effective pressure
2. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
57.48 mm
Malleability
Boyle's law
110.6 kPa
3. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
The specific heat of the material
Unified National
Details of P & IDs
70 MPa
4. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
Sensible heat
Details of P & IDs
Cast iron
0.89
5. Pythagoras' Theorem
A
White metal and bronze
elasticity
benefits of chromium
6. Safe working stress is determined by...
Dividing the ultimate strength by the factor of safety
Work
Latent heat of evaporation
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
7. Ratio of the opposite to the adjacent side of a right- angled triangle
Tangent
Resultant
Work
Calorimetry
8. 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
polytropic
Opposite side / hypotenuse
Continuity flow
Gamma - coefficient of superficial = 2x coefficient of linear expansion
9. Work per power stroke (J)
Pm x A x L
Specific heat
Stroke
Value of the angle increases
10. Force
The elastic limit of the material is not exceeded
Mass x acceleration (N)
To calculate power from an engine
Unified National
11. 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
Mass x acceleration (N)
Cathodic protection system
70 MPa
12. Acute angle
Isothermal
Pm x A x L x N
A / SinA = b / SinB = c / SinC
Less than 90 degrees
13. Obtuse angle
Be the same at any point in the process
Hooke's Law
More than 90 degrees
Chlorides
14. A closed plane figure bounded by straight sides
Sulfuric acid
Problem solving order
That is supported at two ends
polygon
15. Aka stray current electrolysis - caused be an external source of current - non intended paths due to poor electrical conductor
8908 kJ
Stray current corrosion
Total heat required for change of state
One
16. Right angle
One angle is exactly 90 degrees
benefits of chromium
Pm x A x L
A / SinA = b / SinB = c / SinC
17. Steam turbine bearings are usually made of...
Heat engines
0.0723
Continuity flow
White metal and bronze
18. The force that is equal in magnitude but opposite in direction to the resultant force is called
Latent heat of evaporation
The equilibrant
distance
45 kN
19. Straight angle
Chlorides
Scalene triangle
Power
Exactly 180 degrees
20. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
A number with the necessary unit
basic oxygen process
Celsius
0.0002
21. coefficient of superficial (area) expansion
2.3026
Greater than 180 degrees
Gamma - coefficient of superficial = 2x coefficient of linear expansion
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
22. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
A Greek letter alpha linear
Complementary angles
A = 4/3h2 [(square root)d/h-0.608]
Work
23. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
Specific heat
A
4.4 m/s
Work
24. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Heat engines
linear motion relationships
Work
Problem solving order
25. The act or process of measuring
Mensuration
Complementary angles
Details of P & IDs
Malleability
26. A 10 m long steel pipe when heated to increase its temperature by 85
water equivalent
benefits of copper
1 cm
benefits of chromium - nickel and copper in alloy steels
27. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Stroke
Permanent and removable
Heating and cooling white cast iron at a controlled rate
520.72 kJ/kg
28. 1. In a right angle triangle - the sine of an acute angle is equal to...
ellipse
Material balance
57.48 mm
Opposite side / hypotenuse
29. A parallelogram with adjacent sides of unequal lengths
Rhomboid
Total heat required for change of state
One
Transformed to different forms
30. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
Ideal mechanical advantage
Falling temperature
dryness fraction
hardness
31. In the equation 0.004 + D = 0.0042 - the value of D is...
polytropic
0.0002
Be the same at any point in the process
Work
32. P & IDs
10.8 m N of W
Pm x A x L
Mechanical flow diagrams
View of a cutting plane
33. Resistance to wear - abrasion and penetration
A
1 cm
hardness
Greater than 180 degrees
34. Negative terminal of the rectifier must always be connected to the structure that is being protected
Cathodic protection system
A. sine of 90
dryness fraction
The equilibrant
35. Velocity ratio is...
One angle is exactly 90 degrees
Details of P & IDs
520.72 kJ/kg
Ideal mechanical advantage
36. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Opposite side / hypotenuse
8908 kJ
To calculate power from an engine
Stroke
37. The precise measurement of heat flow out of a system for chemical and physical processes
Problem solving order
1 cm
Calorimetry
A solution
38. The most common scale in use is the...
Pm x A x L x N
A solution
Malleability
Celsius
39. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
benefits of nickel
Malleability
water equivalent
Trapezoid
40. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Naperian (Natural) logarithms
Increase
Malleability
Sulfuric acid
41. 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
Areas of sectors (bounded by 2 radii and arc between them)
10.8 m N of W
distance
42. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
Boyle's law
velocity
Octagon
The specific heat of the material
43. Use of the equation PV = a constant - means the numerical result of pressure times volume for a compression or expansion process will
Cathodic protection system
Be the same at any point in the process
View of a cutting plane
Problem solving order
44. As the cosine decreases - the...
White metal and bronze
M x g x h (kg x 9.81 m/s/s x height (m))
Value of the angle increases
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
45. Ability to withstand deformation above elastic limit under compression without failure
Purpose of material balance
Resultant
Malleability
A
46. A straight line that joins 2 points or circumference
Chord
179.02
8908 kJ
To calculate power from an engine
47. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
As a ratio
45 kN
Conditions required to produce sulphide corrosion cracking
benefits of copper
48. Kinetic energy (Ek)
displacement
Work
Composite material
1/2mv2 (kg x velocity(m/s))
49. 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
View of a cutting plane
Coefficient of friction
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Details of P & IDs
50. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
More than 90 degrees
Tangent
Total heat required for change of state
A twisting or turning effect