SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
Less than 90 degrees
Mass x acceleration (N)
110.6 kPa
Dividing the ultimate strength by the factor of safety
2. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Heat engines
Material balance
velocity
Hooke's Law
3. 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?
0.0723
2.3026
Problem solving order
45 kN
4. Force - work done - power - mechanical efficiency
hardness
Problem solving order
basic oxygen process
Specific heat
5. Micro organisms promote corrosion...
Coefficient of friction
2.3026
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
General gas law
6. The term _____ is used as a measure of the quantity of matter.
Mass
Greater than 180 degrees
distance
effective pressure
7. Is the heat being added or removed to/from a substance without a change of state - still having a changing in temp
elasticity
Sensible heat
Less than 90 degrees
Mensuration
8. 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
A = 4/3h2 [(square root)d/h-0.608]
Dividing the ultimate strength by the factor of safety
White
9. As the cosine decreases - the...
Mass x acceleration (N)
Mechanical flow diagrams
Conditions required to produce sulphide corrosion cracking
Value of the angle increases
10. Work per second
Transformed to different forms
Pm x A x L x N
Purpose of material balance
View of a cutting plane
11. The force that is equal in magnitude but opposite in direction to the resultant force is called
Celsius
1/2mv2 (kg x velocity(m/s))
The equilibrant
Falling temperature
12. Steam turbine bearings are usually made of...
110.6 kPa
Details of P & IDs
White metal and bronze
polytropic
13. For making steal is done in a pear shaped vessel that refines molten iron from a blast furnace and scrap into steel
Sulfuric acid
Continuity flow
basic oxygen process
Power
14. u = initial velocity (m/s) - v = final velocity (m/s) - t = time (s) - s = distance (m) - a = acceleration (m/s/s) - g = acceleration due to gravity (m/s/s)
linear motion relationships
water equivalent
benefits of chromium - nickel and copper in alloy steels
Mensuration
15. Pythagoras' Theorem
Sensible heat
Stray current corrosion
Scalene triangle
A
16. 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
0.0723
benefits of chromium - nickel and copper in alloy steels
One
Specific heat
17. Ability to withstand deformation above elastic limit under compression without failure
Pm x A x L
effective pressure
Conditions required to produce sulphide corrosion cracking
Malleability
18. Stainless fails due to...
161
Chlorides
Purpose of P & IDs
Pm x A x L x N
19. Any two angles whose sum is 90
Heat engines
161
Complementary angles
Isothermal
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
Specific heat
ellipse
Isothermal
Toughness
21. The most common material used in making large industrial diesel engine pistons is...
Dividing the ultimate strength by the factor of safety
displacement
Cast iron
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
22. 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
Cast iron
Octagon
View of a cutting plane
70 MPa
23. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
effective pressure
basic oxygen process
distance
Total heat required for change of state
24. 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.
Isothermal
dryness fraction
hardness
brinell hardness test
25. Reflex angle
One angle is exactly 90 degrees
Ideal mechanical advantage
Greater than 180 degrees
Isosceles triangle
26. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
Areas of sectors (bounded by 2 radii and arc between them)
White
hexagon
Increase
27. Right angle
One angle is exactly 90 degrees
The specific heat of the material
As a ratio
Power
28. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Work
Latent heat of evaporation
Power
More than 90 degrees
29. Dangerous because a crack starts slowly and propagate slowly - exceed breaking strength and the metal fails suddenly - stress must be tensile can be produced by an external load or residual stress - condensed moisture and change in temperature
Stress corrosion cracking
Malleability
Celsius
70 MPa
30. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
Work
520.72 kJ/kg
A / SinA = b / SinB = c / SinC
Heating and cooling white cast iron at a controlled rate
31. 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...
2.3026
Latent heat of evaporation
A twisting or turning effect
Charles Law
32. If a right- angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm - the length of the opposite side is...
Less than 90 degrees
57.48 mm
White
Cathodic protection system
33. Of a process or change taking place at constant temperature - PV = C
Falling temperature
A twisting or turning effect
Isothermal
0.89
34. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
0.89
Dividing the ultimate strength by the factor of safety
Calorimetry
distance
35. P & IDs
A. sine of 90
polygon
Mechanical flow diagrams
110.6 kPa
36. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
benefits of nickel
hexagon
Mechanical flow diagrams
Mass
37. One is the trigonometric value of...
General gas law
Tangent
A. sine of 90
Scalene triangle
38. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
Cast iron
Coefficient of friction
Stroke
M x g x h (kg x 9.81 m/s/s x height (m))
39. 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
1/2mv2 (kg x velocity(m/s))
Conditions required to produce sulphide corrosion cracking
The elastic limit of the material is not exceeded
A Greek letter alpha linear
40. 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
benefits of chromium - nickel and copper in alloy steels
110.6 kPa
benefits of chromium
Toughness
41. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Naperian (Natural) logarithms
elasticity
Cast iron
More than 90 degrees
42. Factor of safety
Ultimate stress/working stress
Value of the angle increases
Malleability
Purpose of material balance
43. Mechanical efficiency
Output power(W)/input power(W)
Total heat required for change of state
Coefficient of friction
A = 4/3h2 [(square root)d/h-0.608]
44. A 10 m long steel pipe when heated to increase its temperature by 85
distance
To calculate power from an engine
1 cm
Latent heat of evaporation
45. Area of a segment
A = 4/3h2 [(square root)d/h-0.608]
basic oxygen process
Hooke's Law
effective pressure
46. The factor of safety is always expressed...
As a ratio
One angle is exactly 90 degrees
Rhomboid
effective pressure
47. A parallelogram with four equal sides
Ultimate stress/working stress
A
Continuity flow
Rhombus
48. A closed plane figure bounded by straight sides
Specific heat
Value of the angle increases
polygon
Total heat required for change of state
49. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
benefits of chromium - nickel and copper in alloy steels
Isosceles triangle
Latent heat of evaporation
linear motion relationships
50. A 1 N weight has a kinetic energy of 1 J when its speed is...
Heating and cooling white cast iron at a controlled rate
Specific heat
4.4 m/s
Material balance