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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
hexagon
Problem solving order
Adiabatic
distance
2. PFDs
Process flow drawing
Scalene triangle
1 cm
Ammonia
3. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
Octagon
Naperian (Natural) logarithms
110.6 kPa
basic oxygen process
4. Whether a material will break under sudden impact or hard blow
Problem solving order
Continuity flow
Work
Toughness
5. As the cosine decreases - the...
Value of the angle increases
White
Falling temperature
Isosceles triangle
6. Cosine rule
A
Permanent and removable
As a ratio
Cast iron
7. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
Mass
70 MPa
Increase
Malleability
8. Combines easily with many other elements - improves atmospheric corrosion resistance - increases strength - amounts of 0.15-0.25%
benefits of copper
Sensible heat
0.0723
0.0002
9. A scalar quantity is one which has only magnitude and can be fully described by...
Be the same at any point in the process
A number with the necessary unit
Mass x acceleration (N)
Permanent and removable
10. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Hooke's Law
To calculate power from an engine
The elastic limit of the material is not exceeded
water equivalent
11. The pressure that should be used when calculating power - pressure is not constant throughout a power stroke - decreases as gas/steam expands
Celsius
effective pressure
Material balance
Continuity flow
12. Copper fails due to...
Ammonia
A twisting or turning effect
Areas of sectors (bounded by 2 radii and arc between them)
A Greek letter alpha linear
13. 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...
Be the same at any point in the process
10.8 m N of W
benefits of nickel
Stray current corrosion
14. Work per power stroke (J)
Hooke's Law
1/2mv2 (kg x velocity(m/s))
Pm x A x L
Value of the angle increases
15. 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
Continuity flow
A solution
A = 4/3h2 [(square root)d/h-0.608]
More than 90 degrees
16. Expansion of a gas is said to be adiabatic when expansion takes place at...
2.3026
Falling temperature
520.72 kJ/kg
Continuity flow
17. Ability to withstand deformation above elastic limit under compression without failure
One angle is exactly 90 degrees
Malleability
A number with the necessary unit
Coefficient of friction
18. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Power
Unified National
Process flow drawing
Resultant
19. 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
Total heat required for change of state
benefits of chromium
Sensible heat
Unified National
20. 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
Greater than 180 degrees
One angle is exactly 90 degrees
elasticity
Coefficient of friction
21. The amount of heat required to completely melt 25 kg of ice from a temperature of -10
8908 kJ
basic oxygen process
110.6 kPa
Divide the maximum load by the original cross - sectional area
22. PVn(super script n) = C
polytropic
0.0002
Ammonia
70 MPa
23. Micro organisms promote corrosion...
Mass x acceleration (N)
Under deposit corrosion - enhanced oxygen generation - contact of live organisms
Calorimetry
Mensuration
24. 1.not showing temperatures or pressures 2. piping ID numbers and sizing 3. all instrumentation 4. piping details
Details of P & IDs
Composite material
A = 4/3h2 [(square root)d/h-0.608]
Sulfuric acid
25. Steam turbine bearings are usually made of...
Cathodic protection system
White
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
White metal and bronze
26. Is the required to change a unit mass from a gas to liquid or liquid to a gas
Sulfuric acid
latent heat of evaporation (vaporation)
110.6 kPa
Increase
27. The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is...
Coefficient of friction
Rhombus
Stray current corrosion
0.89
28. coefficient of expansion
Malleability
Specific heat
Greater than 180 degrees
A Greek letter alpha linear
29. The rate at which heat flow through a slab of a material does not depend on...
The specific heat of the material
Stroke
70 MPa
A. sine of 90
30. Being made of 2 or more substances creating unique characteristics and properties when combine
1/2mv2 (kg x velocity(m/s))
latent heat of evaporation (vaporation)
Composite material
Pm x A x L
31. Malleable cast iron is produced by...
Chord
Heating and cooling white cast iron at a controlled rate
Isothermal
Material balance
32. When calculating the ultimate stress of a material - we should
Resultant
26.81 m/s
A. sine of 90
Divide the maximum load by the original cross - sectional area
33. The classes of fastening devices are...
Stray current corrosion
Permanent and removable
A
Specific heat
34. 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
Resultant
elasticity
effective pressure
35. In the equation 0.004 + D = 0.0042 - the value of D is...
A twisting or turning effect
26.81 m/s
linear motion relationships
0.0002
36. Obtuse angle
hardness
More than 90 degrees
1 cm
Less than 90 degrees
37. The factor of safety is always expressed...
Continuity flow
Greater than 180 degrees
As a ratio
Purpose of P & IDs
38. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
26.81 m/s
Purpose of P & IDs
Specific heat
Resultant
39. Safe working stress is determined by...
Dividing the ultimate strength by the factor of safety
0.0723
Conditions required to produce sulphide corrosion cracking
Adiabatic
40. Compounds classified as salts may have the following characteristics
To calculate power from an engine
Mensuration
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
A
41. The most common thread used in North America on fasteners such as bolts - is the...
Unified National
A number with the necessary unit
Greater than 180 degrees
Naperian (Natural) logarithms
42. 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
elasticity
M x g x h (kg x 9.81 m/s/s x height (m))
Latent heat of evaporation
Octagon
43. 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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44. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
dryness fraction
Rhombus
Octagon
Specific heat
45. Refers to the length of the actual path over which a body travels - not concerned with direction - magnitude only
distance
Falling temperature
ellipse
Material balance
46. Straight angle
Areas of sectors (bounded by 2 radii and arc between them)
Exactly 180 degrees
Less than 90 degrees
dryness fraction
47. 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
Chord
Hooke's Law
Stress corrosion cracking
Naperian (Natural) logarithms
48. Work per second
General gas law
Pm x A x L x N
2.3026
Exactly 180 degrees
49. Potential energy (Ep)
M x g x h (kg x 9.81 m/s/s x height (m))
A Greek letter alpha linear
A twisting or turning effect
One
50. 1. Info for sizing equipment 2.compare plant performance against design: flow rates - efficiencies - recovery efficiencies
A / SinA = b / SinB = c / SinC
Purpose of material balance
A Greek letter alpha linear
polytropic