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Test your basic knowledge |
Power Engineering
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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. The precise measurement of heat flow out of a system for chemical and physical processes
Ultimate stress/working stress
Isothermal
Calorimetry
displacement
2. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
10.8 m N of W
Power
Stress corrosion cracking
Calorimetry
3. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
57.48 mm
110.6 kPa
A
More than 90 degrees
4. 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
Mensuration
10.8 m N of W
Purpose of material balance
displacement
5. Kinetic energy (Ek)
1/2mv2 (kg x velocity(m/s))
Trapezium
Specific heat
Heat engines
6. Energy can be...
Transformed to different forms
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
2.3026
Be the same at any point in the process
7. Means that the sum of the matter leaving the plant equals the sum of the matter entering
Material balance
Malleability
Latent heat of evaporation
hexagon
8. A scalar quantity is one which has only magnitude and can be fully described by...
Pm x A x L x N
One angle is exactly 90 degrees
A number with the necessary unit
A. sine of 90
9. The force that is equal in magnitude but opposite in direction to the resultant force is called
Cathodic protection system
elasticity
A = 4/3h2 [(square root)d/h-0.608]
The equilibrant
10. The term _____ is used as a measure of the quantity of matter.
Divide the maximum load by the original cross - sectional area
Mass
A Greek letter alpha linear
Malleability
11. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
Stroke
To calculate power from an engine
Boyle's law
Composite material
12. Stainless fails due to...
Power
Chlorides
Ammonia
To calculate power from an engine
13. Resistance to wear - abrasion and penetration
hardness
Specific heat
effective pressure
polygon
14. Of a process or change taking place at constant temperature - PV = C
0.89
basic oxygen process
Isothermal
linear motion relationships
15. In the equation 0.004 + D = 0.0042 - the value of D is...
brinell hardness test
Isosceles triangle
Heat engines
0.0002
16. The most common scale in use is the...
110.6 kPa
Celsius
hexagon
displacement
17. Sine Rule
Trapezium
effective pressure
A / SinA = b / SinB = c / SinC
Mensuration
18. Right angle
General gas law
Falling temperature
White
One angle is exactly 90 degrees
19. The relationship between the pressure and volume of a gas at constant temperture; when volume increase - pressure decreases.
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20. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
Chlorides
45 kN
dryness fraction
Unified National
21. The total direction traveled by the piston within a cylinder power stroke - if pressure is being applied during the stroke
A
Stroke
Ammonia
Increase
22. The most common material used in making large industrial diesel engine pistons is...
benefits of copper
Cast iron
1 cm
dryness fraction
23. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
Pm x A x L
A twisting or turning effect
hardness
The elastic limit of the material is not exceeded
24. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
Process flow drawing
Specific heat
Areas of sectors (bounded by 2 radii and arc between them)
Resultant
25. Mechanical efficiency
Isothermal
Output power(W)/input power(W)
Trapezoid
Boyle's law
26. As the cosine decreases - the...
Ammonia
Value of the angle increases
10.8 m N of W
Composite material
27. A triangle with two equal sides
45 kN
Specific heat
Isosceles triangle
Boyle's law
28. 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?
Total heat required for change of state
One
45 kN
dryness fraction
29. 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)
Cathodic protection system
linear motion relationships
Mechanical flow diagrams
Composite material
30. A 1 N weight has a kinetic energy of 1 J when its speed is...
4.4 m/s
hexagon
Mensuration
Permanent and removable
31. Factor of safety
Ultimate stress/working stress
Details of P & IDs
Falling temperature
A. sine of 90
32. Potential energy (Ep)
A. sine of 90
Coefficient of cubical expansion is often used instead of 'volume' - coefficient of liquids only
26.81 m/s
M x g x h (kg x 9.81 m/s/s x height (m))
33. 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
Purpose of P & IDs
Ideal mechanical advantage
Naperian (Natural) logarithms
polygon
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.
Heating and cooling white cast iron at a controlled rate
Malleability
Dividing the ultimate strength by the factor of safety
brinell hardness test
35. Reflex angle
Heating and cooling white cast iron at a controlled rate
Greater than 180 degrees
M x g x h (kg x 9.81 m/s/s x height (m))
Opposite side / hypotenuse
36. 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
Boyle's law
Octagon
White
70 MPa
37. Velocity ratio is...
Material balance
Calorimetry
Ideal mechanical advantage
Mechanical flow diagrams
38. 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
Purpose of material balance
A number with the necessary unit
One
39. Steam engines - steam turbines - gas turbines and internal combustion engines are examples of...
Rhomboid
brinell hardness test
Heat engines
More than 90 degrees
40. One is the trigonometric value of...
Greater than 180 degrees
A. sine of 90
polygon
Chlorides
41. Is 'the equivalent mass of water that would require the same amount of heat transfer as the substance - to produce the same temp. change
0.89
water equivalent
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Malleability
42. Resistance to corrosion - improved properties at high and low temperatures - lowers coefficient of expansion
benefits of chromium - nickel and copper in alloy steels
Mensuration
A. sine of 90
Increase
43. Force
Cathodic protection system
linear motion relationships
Mass x acceleration (N)
dryness fraction
44. The heat required to raise the temperature of water at a pressure of 225 kPa from 0
Stroke
General gas law
Stress corrosion cracking
520.72 kJ/kg
45. Safe working stress is determined by...
Isosceles triangle
Dividing the ultimate strength by the factor of safety
benefits of nickel
One angle is exactly 90 degrees
46. The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be...
70 MPa
1/2mv2 (kg x velocity(m/s))
45 kN
Problem solving order
47. Ability to withstand deformation above elastic limit under compression without failure
Permanent and removable
Malleability
Rhombus
A / SinA = b / SinB = c / SinC
48. Compounds classified as salts may have the following characteristics
Heating and cooling white cast iron at a controlled rate
Divide the maximum load by the original cross - sectional area
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
To calculate power from an engine
49. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Pm x A x L x N
Increase
elasticity
Total heat required for change of state
50. 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
8908 kJ
Naperian (Natural) logarithms
polygon
Coefficient of friction
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