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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. Force - work done - power - mechanical efficiency
Problem solving order
Purpose of P & IDs
10.8 m N of W
General gas law
2. The temperature of saturated steam vapor at 980 kPa is...
A / SinA = b / SinB = c / SinC
ellipse
179.02
Mensuration
3. Acute angle
Ideal mechanical advantage
Less than 90 degrees
Mechanical flow diagrams
Scalene triangle
4. Any two angles whose sum is 90
Complementary angles
A
Pm x A x L
Purpose of material balance
5. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
179.02
520.72 kJ/kg
4.4 m/s
A solution
6. Right angle
Heat engines
2.3026
Boyle's law
One angle is exactly 90 degrees
7. Obtuse angle
More than 90 degrees
Trapezoid
A Greek letter alpha linear
Boyle's law
8. The rate at which heat flow through a slab of a material does not depend on...
Heating and cooling white cast iron at a controlled rate
Continuity flow
The specific heat of the material
A number with the necessary unit
9. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
Cathodic protection system
polygon
benefits of chromium - nickel and copper in alloy steels
distance
10. A 10 m long steel pipe when heated to increase its temperature by 85
1 cm
benefits of chromium - nickel and copper in alloy steels
Exactly 180 degrees
M x g x h (kg x 9.81 m/s/s x height (m))
11. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
Isothermal
To calculate power from an engine
distance
57.48 mm
12. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Work
4.4 m/s
Pm x A x L
1 cm
13. Work per power stroke (J)
Naperian (Natural) logarithms
Scalene triangle
Rhombus
Pm x A x L
14. A triangle with no two sides of equal length
Purpose of P & IDs
Scalene triangle
Ideal mechanical advantage
A number with the necessary unit
15. A triangle with two equal sides
Transformed to different forms
Rhombus
Value of the angle increases
Isosceles triangle
16. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
A
Trapezium
57.48 mm
effective pressure
17. The most common scale in use is the...
Pm x A x L x N
Areas of sectors (bounded by 2 radii and arc between them)
Celsius
Mechanical flow diagrams
18. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Work
latent heat of evaporation (vaporation)
Pm x A x L
To calculate power from an engine
19. 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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20. The most common material used in making large industrial diesel engine pistons is...
Cast iron
benefits of nickel
Charles Law
Value of the angle increases
21. Straight angle
ellipse
Exactly 180 degrees
Coefficient of friction
A = 4/3h2 [(square root)d/h-0.608]
22. coefficient of superficial (area) expansion
View of a cutting plane
Charles Law
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Material balance
23. Is the amount of heat/energy required to increase or decrease the temperature of any given substance's unit mass 1 degree Celsius
Specific heat
View of a cutting plane
Unified National
Toughness
24. A parallelogram with adjacent sides of unequal lengths
Mensuration
0.89
The equilibrant
Rhomboid
25. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
Value of the angle increases
110.6 kPa
Dividing the ultimate strength by the factor of safety
70 MPa
26. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Stroke
Be the same at any point in the process
Increase
Unified National
27. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Stroke
White metal and bronze
A
The specific heat of the material
28. A gas occupies 8.62 m3 at 1800 kPa and 26
Increase
161
Greater than 180 degrees
Trapezium
29. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Unified National
Scalene triangle
Latent heat of evaporation
basic oxygen process
30. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
70 MPa
Pm x A x L x N
8908 kJ
basic oxygen process
31. 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
displacement
Material balance
Falling temperature
0.0723
32. The precise measurement of heat flow out of a system for chemical and physical processes
To calculate power from an engine
A number with the necessary unit
Calorimetry
A
33. coefficient of expansion
26.81 m/s
Less than 90 degrees
Trapezium
A Greek letter alpha linear
34. When classifying beams - the term simple beam refers to a beam
That is supported at two ends
179.02
General gas law
water equivalent
35. As the cosine decreases - the...
Value of the angle increases
Coefficient of friction
70 MPa
Dividing the ultimate strength by the factor of safety
36. The law that states that for a fixed amount of gas at a constant pressure - the volume of the gas increases as the temperature of the gas increases and the volume of the gas decreases as the temperature of the gas decreases
Charles Law
1/2mv2 (kg x velocity(m/s))
M x g x h (kg x 9.81 m/s/s x height (m))
A twisting or turning effect
37. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Ammonia
Heat engines
Naperian (Natural) logarithms
Output power(W)/input power(W)
38. The classes of fastening devices are...
10.8 m N of W
To calculate power from an engine
Permanent and removable
Greater than 180 degrees
39. Stainless fails due to...
Chlorides
Mass
distance
Heating and cooling white cast iron at a controlled rate
40. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Trapezium
To calculate power from an engine
elasticity
Power
41. A quadrilateral with no parallel sides
Celsius
Trapezium
M x g x h (kg x 9.81 m/s/s x height (m))
8908 kJ
42. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Complementary angles
effective pressure
White
Exactly 180 degrees
43. Whether a material will break under sudden impact or hard blow
A number with the necessary unit
hardness
Toughness
To calculate power from an engine
44. Mechanical efficiency
1 cm
Isosceles triangle
Output power(W)/input power(W)
Ammonia
45. Resistance to corrosion and oxidation at high temperatures - improves toughness - prevents brittleness at low temperatures - increases strength without affecting toughness - amounts range from 1-4% - high impact resistance at amounts as high as 36% -
benefits of nickel
179.02
Gamma - coefficient of superficial = 2x coefficient of linear expansion
M x g x h (kg x 9.81 m/s/s x height (m))
46. 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
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Details of P & IDs
A solution
Relative density
47. 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.
brinell hardness test
Be the same at any point in the process
Heating and cooling white cast iron at a controlled rate
Celsius
48. 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
Work
Power
Scalene triangle
Octagon
49. Factor of safety
Ultimate stress/working stress
water equivalent
A
A Greek letter alpha linear
50. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Material balance
The equilibrant
0.89
Specific heat