The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!
From the Wiki University
What evidence can you provide to prove your understanding of each of the following citeria?
Calculate heat mixtures involving water equivalent, change of phase, and feed heating
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Key terms associated with heat transmission are explained Completed |
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Heat transfer is calculated between liquids and solids using water equivalent Completed |
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Flow is differentiated from non-flow heating and cooling processes Completed |
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Effects of superheating and sub-cooling on steam plant efficiency are outlined Completed |
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Mass balance throughout a steam plant cycle is constructed and effects of pressure and temperature on cycle efficiency are analysed Completed |
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Determine fluid properties of steam
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Relationship between saturated and superheated steam, including dryness fraction, is explained Completed |
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Regions on a temperature/enthalpy diagram are constructed and identified Completed |
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Steam tables are used to determine fluid properties Completed |
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Changes of enthalpy throughout a system are identified Completed |
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Operating principles and application in steam plants of throttling, separating and combined throttling, and separating calorimeters are explained Completed |
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Calorimeters are applied to determine dryness fraction of steam Completed |
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Calculate boiler efficiency and boiler water density
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Efficiency of saturated and superheated steam boilers is calculated Completed |
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Where loss of efficiency occurs is shown Completed |
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Concept of parts per million for density of boiler water is explained Completed |
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Changes in boiler water density due to contaminated feed are calculated Completed |
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How acceptable dissolved solids and water levels may be maintained in a boiler is shown Completed |
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Determine steam turbine velocity
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Principles and differences between pressure and velocity changes in reaction and impulse steam turbines are explained Completed |
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Velocity diagrams to calculate steam velocity at exit of nozzles and blades are applied Completed |
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Graphical and mathematical methods to determine blade angle, steam velocity, thrust, power, and efficiency of single stage impulse and reaction steam turbines are applied Completed |
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Calculate calorific value and the air fuel ratio for solid and liquid fuels
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Elements and compounds present in fuel and the products of combustion are evaluated Completed |
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Air/fuel ratio, gravimetric and volumetric analysis are explained Completed |
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Chemical equations for combustion elements and compounds are developed and elements of combustion are analysed Completed |
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Bomb calorimeter is used to find calorific value of a fuel Completed |
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Formula to calculate calorific value of a fuel from mass analysis of fuel is applied Completed |
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Air required for combustion is calculated Completed |
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Calculate thermal expansion
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Coefficient of linear expansion and its significance to different materials is explained Completed |
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Clearances and shrunk fit allowances are calculated Completed |
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Stresses generated with restricted expansion are calculated Completed |
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Volumetric expansion of solid and liquids, and allowance required for fluid expansion in tanks and systems is calculated Completed |
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Apply gas law equations
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Compression and pressure ratio is explained and related to combined gas law equation Completed |
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Combined gas law equation is applied to constant volume and constant pressure processes Completed |
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Specific gas constant of a gas or mixture of gases is calculated Completed |
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Differentiation is made between specific heat of gases, ratio of specific heats, work and change in internal energy Completed |
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Changes in internal energy associated with specific heat of gases, ratio of specific heats and work are calculated Completed |
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Calculate gas conditions, work and thermal efficiency of internal combustion engines
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Processes associated with expansion and compression of gases are explained Completed |
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Gas conditions and index of compression at end of each process are determined Completed |
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Work formula is derived for each process and derived formula is applied to calculate work and power per cycle Completed |
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Air standard cycle is applied to determine amount of fuel consumed and work produced by an internal combustion engine Completed |
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Differentiation is made between air standard efficiency and thermal efficiency Completed |
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Thermal efficiency of engine cycles is calculated Completed |
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Perform calculations related to refrigeration and air conditioning cycles
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Pressure/enthalpy diagram is applied to describe the refrigeration cycle Completed |
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Importance of superheating and under-cooling in determining stability and well-functioning of refrigeration systems is explained Completed |
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Properties and hazards of refrigerants used in refrigeration and air conditioning systems are identified Completed |
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Refrigeration tables are applied to calculate refrigeration effect, cooling load and coefficient of performance Completed |
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Basic air conditioning cycles are explained Completed |
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Wet and dry bulb temperatures are explained Completed |
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Humidity conditions are determined using psychrometric charts Completed |
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Solve heat transfer problems involving flat plates and thin cylinders
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Different forms of heat transfer are identified Completed |
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Heat flow through composite flat plates using thermal conductivity is calculated Completed |
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Interface temperatures of composite flat layers are calculated Completed |
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Radial conduction of heat through a thin cylinder is calculated Completed |
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Solve problems related to single and multi stage air compression
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Pressure–volume diagram is applied to describe operating cycle of reciprocating compressors Completed |
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Work done by constant pressure, isothermal processes and polytropic processes in reciprocating compressors is calculated Completed |
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Effect of clearance volume on efficiency of reciprocating compressors is explained Completed |
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Volumetric efficiency and free air discharge in reciprocating compressors is calculated Completed |
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Volume, mass flow and temperature are calculated at completion of each process in reciprocating compressors Completed |
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How inter-cooling and after-cooling affects overall efficiency of reciprocating compressors is explained Completed |
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Quantity of cooling water required by reciprocating compressors is calculated Completed |
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Perform calculations related to engine power and heat balances
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Indicator and timing diagrams for internal combustion engines are plotted Completed |
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Formula is applied to solve problems related to indicated power of internal combustion engines Completed |
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Formula is applied to solve problems related to brake power of internal combustion engines Completed |
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Morse test is applied to determine the indicated power of internal combustion engines Completed |
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Tabular and graphical heat balance diagrams are applied to calculate mechanical, thermal and overall efficiencies of internal combustion engines Completed |
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