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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. 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
Malleability
Toughness
1 cm
2. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
hardness
Coefficient of friction
velocity
Relative density
3. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
26.81 m/s
Chord
Sensible heat
Increase
4. 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
Dividing the ultimate strength by the factor of safety
Purpose of P & IDs
Calorimetry
Scalene triangle
5. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
water equivalent
Sensible heat
To calculate power from an engine
45 kN
6. Ratio of the opposite to the adjacent side of a right- angled triangle
Mechanical flow diagrams
Tangent
4.4 m/s
Ammonia
7. Is seen in equations involving logarithms - it means that the formula is converting from one base system to another.
2.3026
Adiabatic
basic oxygen process
Boyle's law
8. Velocity ratio is...
That is supported at two ends
Stray current corrosion
To calculate power from an engine
Ideal mechanical advantage
9. Straight angle
Stray current corrosion
ellipse
Exactly 180 degrees
Adiabatic
10. A closed plane figure bounded by straight sides
Pm x A x L
polygon
10.8 m N of W
Areas of sectors (bounded by 2 radii and arc between them)
11. Whether a material will break under sudden impact or hard blow
Toughness
Less than 90 degrees
Adiabatic
Chlorides
12. Steam turbine bearings are usually made of...
One
White metal and bronze
brinell hardness test
57.48 mm
13. PVn(super script n) = C
Dividing the ultimate strength by the factor of safety
Pm x A x L
brinell hardness test
polytropic
14. A 10 m long steel pipe when heated to increase its temperature by 85
0.0002
Malleability
Be the same at any point in the process
1 cm
15. Ability to withstand deformation above elastic limit under compression without failure
Sulfuric acid
Coefficient of friction
Malleability
A = 4/3h2 [(square root)d/h-0.608]
16. PV=nRT - Boyle's law and Charle's law combined
General gas law
Areas of sectors (bounded by 2 radii and arc between them)
Total heat required for change of state
Coefficient of friction
17. 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...
effective pressure
Sensible heat
Latent heat of evaporation
Octagon
18. Area of a segment
0.89
Toughness
45 kN
A = 4/3h2 [(square root)d/h-0.608]
19. Mechanical efficiency
Output power(W)/input power(W)
4.4 m/s
Greater than 180 degrees
8908 kJ
20. The force that is equal in magnitude but opposite in direction to the resultant force is called
The equilibrant
Stray current corrosion
10.8 m N of W
Pm x A x L
21. A straight line that joins 2 points or circumference
Increase
Chord
Relative density
Exactly 180 degrees
22. Reflex angle
latent heat of evaporation (vaporation)
benefits of nickel
Greater than 180 degrees
Rhomboid
23. Factor of safety
Ultimate stress/working stress
Purpose of P & IDs
hardness
Latent heat of evaporation
24. In the equation 0.004 + D = 0.0042 - the value of D is...
Heating and cooling white cast iron at a controlled rate
Continuity flow
velocity
0.0002
25. H2SO4 is the chemical formula for...
A. sine of 90
Sulfuric acid
Isosceles triangle
Trapezoid
26. Protons have a mass number of...
Less than 90 degrees
520.72 kJ/kg
One
effective pressure
27. As the cosine decreases - the...
Value of the angle increases
8908 kJ
Ultimate stress/working stress
Mensuration
28. The most common material used in making large industrial diesel engine pistons is...
26.81 m/s
General gas law
Boyle's law
Cast iron
29. 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.
10.8 m N of W
Cast iron
One
brinell hardness test
30. 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
Continuity flow
basic oxygen process
Details of P & IDs
31. The temperature of saturated steam vapor at 980 kPa is...
179.02
polygon
White
Gamma - coefficient of superficial = 2x coefficient of linear expansion
32. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
1 cm
More than 90 degrees
basic oxygen process
Sensible heat
33. A gas occupies 8.62 m3 at 1800 kPa and 26
General gas law
distance
Isothermal
161
34. 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
ellipse
0.89
26.81 m/s
One angle is exactly 90 degrees
35. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Sulfuric acid
10.8 m N of W
Heat engines
Purpose of P & IDs
36. When calculating the ultimate stress of a material - we should
Divide the maximum load by the original cross - sectional area
brinell hardness test
benefits of chromium
Ammonia
37. A 1 N weight has a kinetic energy of 1 J when its speed is...
dryness fraction
4.4 m/s
Cast iron
Toughness
38. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Continuity flow
0.89
Specific heat
Pm x A x L
39. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Dividing the ultimate strength by the factor of safety
White metal and bronze
latent heat of evaporation (vaporation)
To calculate power from an engine
40. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
Boyle's law
Toughness
benefits of copper
benefits of chromium - nickel and copper in alloy steels
41. The amount of stretch or compression of an elastic material is directly proportional to the applied force - stress = E (modulus of elasticity) x Strain
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42. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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43. 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?
1 cm
Isothermal
45 kN
distance
44. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Mass
White
Isothermal
Ammonia
45. 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
displacement
Mechanical flow diagrams
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
The specific heat of the material
46. Change in tempereature where no heat in transferred - PV(supercript v) = C
benefits of copper
Isosceles triangle
Adiabatic
Trapezium
47. Copper fails due to...
Ammonia
0.0723
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Trapezium
48. Work per power stroke (J)
Heating and cooling white cast iron at a controlled rate
Stroke
Pm x A x L
M x g x h (kg x 9.81 m/s/s x height (m))
49. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
110.6 kPa
Purpose of P & IDs
Latent heat of evaporation
White
50. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
10.8 m N of W
Power
The elastic limit of the material is not exceeded