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?
Explain common thermodynamic principles
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Desired System International (SI) units applicable to thermodynamic calculations are developed Completed |
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Basic properties of fluids are outlined Completed |
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Gauge pressure is distinguished from absolute pressure Completed |
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Temperature is defined and temperature scales are outlined Completed |
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Calculations are performed by applying formulae for work, power and efficiency Completed |
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Calculate properties of gas during expansion and compression
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Calculations are performed by applying Boyle’s, Charles’s and combined gas law Completed |
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Gas equation is derived and applied to gas process calculations Completed |
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Specific heat of gases and the relationship between Cp, Cv, R and Gamma is defined Completed |
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Heat transfer is calculated for constant pressure and constant volume processes Completed |
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Isothermal, adiabatic and polytropic processes are outlined and properties of gases after expansion and compression including the effects of turbocharging are calculated Completed |
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Work required to compress gases is illustrated and calculated Completed |
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Explain methods of heat transfer
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Different forms of heat transfer and their application to marine systems are explained Completed |
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Heat transfer through flat layers is calculated Completed |
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Purpose of insulation is explained Completed |
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Explain enthalpy and apply to mixture calculations
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Heat energy is defined Completed |
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Fundamental formula for heat energy transfer is developed Completed |
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Specific heat and its application are identified Completed |
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Enthalpy and change of phase are outlined Completed |
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Heat mixture problems involving water equivalent, ice, water and steam are solved Completed |
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Specific heat of materials are calculated Completed |
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Latent heat and dryness fraction are identified Completed |
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Steam tables are used to find values of enthalpy for water, saturated and superheated steam and dryness fraction Completed |
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Temperature/enthalpy diagram is constructed from steam table data Completed |
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Explain steam plants and calculate thermal efficiency
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Basic steam plant cycles are sketched and function of each component is outlined Completed |
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Steam cycles on a temperature/enthalpy diagram are illustrated Completed |
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Effects of superheating and under cooling are clarified Completed |
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Calculations are performed for heat supplied, rejected, work and thermal efficiency of a steam plant Completed |
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Methods of improving cycle efficiency are outlined Completed |
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Explain operation of internal combustion engine cycles
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Operating principles of two stroke and four stroke internal combustion engines are outlined Completed |
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Differentiation is made, by use of a pressure/volume diagram, between Otto, Diesel and Dual combustion cycles Completed |
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Mean effective pressure is calculated from an indicator diagram Completed |
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Indicated power formula is developed and related calculations are solved Completed |
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Specific fuel consumption is defined and calculated Completed |
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Ideal cycle and air standard efficiency is defined Completed |
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Explain operating cycle of reciprocating air compressors
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Pressure/volume diagram is used to describe operating cycle of single stage reciprocating air compressors Completed |
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Mass of air delivered by single stage reciprocating air compressors is calculated Completed |
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Clearance volume and its effect on volumetric efficiency is outlined, and volumetric efficiency is calculated Completed |
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Work per cycle for isothermal and polytropic processes is calculated Completed |
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Explain operating cycle of refrigeration and air conditioning plant
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Principle of refrigeration is outlined Completed |
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Temperature/enthalpy and pressure/enthalpy diagrams are compared Completed |
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Refrigerants used in refrigeration and air conditioning machines are identified Completed |
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Refrigeration effect and plant capacity are defined Completed |
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Refrigeration tables are used to calculate refrigeration effect and condition of vapour after expansion Completed |
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Operating cycle of self-contained and centralised air conditioning systems are outlined and compared Completed |
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Relative humidity is defined and key features of a psychrometric chart are outlined Completed |
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Apply linear, superficial and volumetric expansion equations to calculate expansion of liquids and metals
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Expansion processes for metals is defined Completed |
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Coefficient of linear expansion is outlined Completed |
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Linear expansion is applied to calculate machinery clearances and to shrink fit allowances Completed |
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Superficial and volumetric expansion of solids is calculated Completed |
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Apparent expansion of liquids in tanks is calculated Completed |
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