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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. In the equation 0.004 + D = 0.0042 - the value of D is...
10.8 m N of W
45 kN
distance
0.0002
2. Protons have a mass number of...
Continuity flow
One
Mass
Greater than 180 degrees
3. 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.
Calorimetry
brinell hardness test
Scalene triangle
Divide the maximum load by the original cross - sectional area
4. The act or process of measuring
Mensuration
Trapezoid
A solution
Divide the maximum load by the original cross - sectional area
5. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
70 MPa
Details of P & IDs
4.4 m/s
More than 90 degrees
6. Stainless fails due to...
Hooke's Law
161
Chlorides
Conditions required to produce sulphide corrosion cracking
7. 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
Process flow drawing
Problem solving order
Relative density
displacement
8. Copper fails due to...
Chord
velocity
Ammonia
Material balance
9. Potential energy (Ep)
That is supported at two ends
Chlorides
Rhomboid
M x g x h (kg x 9.81 m/s/s x height (m))
10. Right angle
1 cm
Latent heat of evaporation
displacement
One angle is exactly 90 degrees
11. A body having a gravitational force of 2000 N - is pulled along a horizontal surface at constant speed by a rope that makes an angle of 20
Greater than 180 degrees
A = 4/3h2 [(square root)d/h-0.608]
0.0723
Boyle's law
12. 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
Less than 90 degrees
Relative density
benefits of copper
benefits of chromium - nickel and copper in alloy steels
13. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Pm x A x L x N
basic oxygen process
Malleability
26.81 m/s
14. Area of a segment
Areas of sectors (bounded by 2 radii and arc between them)
Details of P & IDs
A = 4/3h2 [(square root)d/h-0.608]
0.0723
15. Safe working stress is determined by...
Dividing the ultimate strength by the factor of safety
Celsius
Latent heat of evaporation
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
16. The amount of stretch or compression of an elastic material is directly proportional to the applied force - stress = E (modulus of elasticity) x Strain
17. PFDs
polygon
Calorimetry
Mensuration
Process flow drawing
18. The precise measurement of heat flow out of a system for chemical and physical processes
Purpose of P & IDs
Composite material
Calorimetry
Ammonia
19. Acute angle
Purpose of P & IDs
Work
Less than 90 degrees
benefits of chromium - nickel and copper in alloy steels
20. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
Ultimate stress/working stress
Total heat required for change of state
dryness fraction
Purpose of P & IDs
21. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
As a ratio
velocity
Exactly 180 degrees
water equivalent
22. The force that is equal in magnitude but opposite in direction to the resultant force is called
Sensible heat
The equilibrant
1/2mv2 (kg x velocity(m/s))
Latent heat of evaporation
23. Being made of 2 or more substances creating unique characteristics and properties when combine
A number with the necessary unit
Composite material
Divide the maximum load by the original cross - sectional area
Pm x A x L
24. Work per power stroke (J)
displacement
Falling temperature
A number with the necessary unit
Pm x A x L
25. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
hexagon
Heat engines
Octagon
polygon
26. The rate at which heat flow through a slab of a material does not depend on...
0.0002
The specific heat of the material
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
27. The ability to return to its original shape after an external force has been removed
elasticity
Celsius
70 MPa
Continuity flow
28. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
Areas of sectors (bounded by 2 radii and arc between them)
8908 kJ
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
Sensible heat
29. Any two angles whose sum is 90
Mass x acceleration (N)
Complementary angles
Increase
water equivalent
30. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
Specific heat
Gamma - coefficient of superficial = 2x coefficient of linear expansion
General gas law
Trapezoid
31. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
Ammonia
0.0002
0.0723
dryness fraction
32. Pythagoras' Theorem
Divide the maximum load by the original cross - sectional area
benefits of chromium - nickel and copper in alloy steels
A
Charles Law
33. A scalar quantity is one which has only magnitude and can be fully described by...
A number with the necessary unit
White
More than 90 degrees
Specific heat
34. The moment of a force about a point is...
View of a cutting plane
A twisting or turning effect
520.72 kJ/kg
hardness
35. A 1 N weight has a kinetic energy of 1 J when its speed is...
0.0723
polygon
Resultant
4.4 m/s
36. A gas occupies 8.62 m3 at 1800 kPa and 26
Boyle's law
161
Charles Law
Material balance
37. Factor of safety
A twisting or turning effect
2.3026
Ultimate stress/working stress
Permanent and removable
38. Mechanical efficiency
Stress corrosion cracking
Output power(W)/input power(W)
1 cm
View of a cutting plane
39. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
A twisting or turning effect
Opposite side / hypotenuse
Stroke
Heating and cooling white cast iron at a controlled rate
40. A triangle with no two sides of equal length
A number with the necessary unit
Relative density
Trapezium
Scalene triangle
41. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
brinell hardness test
520.72 kJ/kg
benefits of nickel
Work
42. Negative terminal of the rectifier must always be connected to the structure that is being protected
Cathodic protection system
Heat engines
polytropic
More than 90 degrees
43. Obtuse angle
Unified National
Conditions required to produce sulphide corrosion cracking
More than 90 degrees
110.6 kPa
44. 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
Sulfuric acid
8908 kJ
Octagon
Less than 90 degrees
45. Orthographic projection means...
polytropic
velocity
Pm x A x L x N
View of a cutting plane
46. When calculating the ultimate stress of a material - we should
Heat engines
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Unified National
Divide the maximum load by the original cross - sectional area
47. A = arc length x radius / 2 - A = (pi/360) x pir2 - length of radii and angle between radii known
brinell hardness test
hexagon
70 MPa
Areas of sectors (bounded by 2 radii and arc between them)
48. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Isothermal
Mass
Naperian (Natural) logarithms
Output power(W)/input power(W)
49. Straight angle
Composite material
M x g x h (kg x 9.81 m/s/s x height (m))
General gas law
Exactly 180 degrees
50. Expansion of a gas is said to be adiabatic when expansion takes place at...
View of a cutting plane
Falling temperature
Less than 90 degrees
Unified National