MARL6001A - Apply intermediate principles of marine electrotechnology
Assessor Resource
MARL6001A Apply intermediate principles of marine electrotechnology
Assessment tool
Version 1.0 Issue Date: March 2023
This unit applies to the work of a Marine Engineer Class 2 on commercial vessels greater than 3000 kW and forms part of the requirements for the Certificate of Competency Marine Engineer Class 2 issued by the Australian Maritime Safety Authority (AMSA).
This unit involves the skills and knowledge required to explain intermediate marine electrotechnology principles and perform intermediate electrical calculations.
You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)
Prerequisites
Not applicable.
Employability Skills
This unit contains employability skills.
Evidence Required
List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, the required skills and knowledge, the range statement and the Assessment Guidelines for the Training Package.
Critical aspects for assessment and evidence required to demonstrate competency in this unit
The evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the Elements, Performance Criteria, Required Skills, Required Knowledge and include:
making accurate and reliable calculations
solving problems using appropriate laws and principles.
Context of and specific resources for assessment
Performance is demonstrated consistently over time and in a suitable range of contexts.
Resources for assessment include access to:
industry-approved marine operations site where intermediate principles of marine electrotechnology can be applied
electrical diagrams, specifications and other information required for performing intermediate electrical calculations
technical reference library with current publications on intermediate marine electrotechnology
tools, equipment and personal protective equipment currently used in industry
relevant regulatory and equipment documentation that impacts on work activities
range of relevant exercises, case studies and/or other simulated practical and knowledge assessments
appropriate range of relevant operational situations in the workplace.
In both real and simulated environments, access is required to:
relevant and appropriate materials and equipment
applicable documentation including workplace procedures, regulations, codes of practice and operation manuals.
A range of assessment methods should be used to assess practical skills and knowledge. The following examples are appropriate to this unit:
direct observation of the candidate applying intermediate principles of marine electrotechnology
direct observation of the candidate applying relevant WHS/OHS requirements and work practices.
Guidance information for assessment
Holistic assessment with other units relevant to the industry sector, workplace and job role is recommended.
In all cases where practical assessment is used it should be combined with targeted questioning to assess Required Knowledge.
Assessment processes and techniques must be appropriate to the language and literacy requirements of the work being performed and the capacity of the candidate.
Submission Requirements
List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here
Assessment task 1: [title] Due date:
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Assessment Tasks
Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.
Required Skills:
Assess own work outcomes and maintain knowledge of current codes, standards, regulations and industry practices
Explain intermediate principles of marine electrotechnology
Explain Faraday’s and Lenz’s Laws of Electromagnetic Induction
Identify and apply relevant mathematical formula and techniques to solve problems related to marine electrotechnology
Identify and interpret numerical and graphical information, and perform mathematical calculations such as the relationship between starting torque and applied voltage in three phase AC induction motors
Identify, collate and process information required to perform calculations related to marine electrotechnology
Impart knowledge and ideas through verbal, written and visual means
Read and interpret written information needed to perform intermediate electrical calculations
Use calculators to perform mathematical calculations
Required Knowledge:
AC induction motors
AC principles
Batteries
Circuit diagrams
DC motors
Difference between AC and DC
Electrical:
current
power
units of measurement
Electromagnetic:
force
induction
Intermediate electrical circuits
Kirchhoff’s circuit laws
Magnetic circuits
National and international maritime regulations, IMO Conventions and Codes applicable to the operation of electrical and electronic control equipment on vessels of typically unlimited propulsion power
Ohm’s Law
Polyphase AC circuits
Principles of:
electrical safety
electrolytic action
electromagnetism
Parallel circuits
Principles and procedures for electrical and electronic measurement
Series circuits
Shipboard DC machinery
Work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices
The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below.
Key parameters of magnetic circuit may include:
Current
Flux
Flux density
Magnetising force
Magneto motive force
Circuit combinations may include:
Resistive/capacitive
Resistive/inductive
Losses may include:
Copper losses
Iron losses or magnetic losses
Mechanical losses
Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.
Observation Checklist
Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice
Yes
No
Comments/feedback
Calculations are performed to solve problems related to resistance, voltage drop, current and power in series and parallel circuits
Calculations are performed to solve problems related to temperature coefficient of resistance and change of resistance of a conductor with a change of temperature
Basic relationships that give total equivalent capacitance for capacitors arranged in series and parallel combinations are derived
Relationships that give total equivalent capacitance to solve numeric problems involving alternating current (AC) and direct current (DC) circuits are applied
Kirchhoff’s circuit laws are explained
Calculations to solve problems involving currents, voltage drop and terminal potential difference for cells connected to form batteries in series and in parallel are performed
Calculations to solve secondary cell charging and discharging problems are performed
Calculations to solve problems related to the efficiency of cells are performed
Key parameters of magnetic circuits are identified
Formula for calculating the amount of flux generated by a multi turn solenoid coil carrying a current to give the B/H relationship is applied
Significance of the varying slopes in the B/H curves for a solenoid coil with air, cast iron, cast steel and mild steel cores is explained
How a magnetic circuit may be created by using a toroidal core within the solenoid coil is shown
Calculations to solve problems relating to magnetic circuits using different materials in different parts of their cores, including air gaps, are performed
Effect on flux density of applying an alternating magnetising force to an iron core is shown diagrammatically
Faraday’s and Lenz’s Laws are applied to solve problems relating to the electromagnetic induction of EMF and current
Generation of EMF is illustrated by a simple, single loop conductor rotating in a uniform magnetic field and how this EMF may be tapped to an external circuit as either AC or DC is explained
How alternating electrical quantities may be represented by rotating phasors is illustrated and explained
Relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities is derived
Mathematical problems are solved by applying relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities
Time constant for different circuit combinations subjected to DC EMF’s is defined
Calculations are performed to solve problems involving time constants in DC circuits with changing rates of current in resistive/inductive elements and changing voltages through resistive/capacitive circuit elements
Differentiation is made between inductive reactance, capacitive reactance and impedance as applied to AC circuits
Effects of inductive and capacitive reactance upon phasor relationships between applied AC voltage and current are shown
Concept of total impedance is applied to solution of problems involving single phase AC quantities in the presence of both resistive/inductive and resistive/capacitive circuit elements, arranged in either series or parallel
Power factor is defined and concepts of real and reactive power usage are applied to solution of problems involving RL and RC elements
How three phase AC may be developed out of simple single phase AC is explained
Voltage and current relationships between line and phase in both Star and Delta 3 phase connections are derived
Standard Star to Delta and Delta to Star conversion relationships for current and voltage are derived
Numeric problems involving both balanced and unbalanced circuit loads are solved
Relationships between kW, kVA and kVAr for 3 phase AC circuits is derived
Calculations are performed using the relationship between kW, kVA and kVAr to solve problems in 3 phase AC circuits
Schematic circuits are prepared for separately excited, series, shunt and compound connected generators and motors to illustrate wiring arrangements used with DC machines
EMF equation for a DC generator to solve shipboard problems is applied
Torque equation for a DC motor to solve shipboard problems is applied
Expression linking back EMF parameters for a DC motor is derived and used to solve shipboard problems
Various losses that can occur in DC motors and generators are calculated
Construction features of the AC synchronous generator are explained
EMF equation for an AC generator is derived, taking into account distribution and pitch factors
Expression for the magnitude and speed of the rotating flux generated by a three-phase supply is derived
Voltage regulation for synchronous generator is defined
Effect of power factor on load characteristic of an AC generator is illustrated
Construction features of the AC induction motor are explained
Expression for slip of an induction motor rotor is derived and applied to frequency of its rotor EMF and current
Expression for magnitude of rotor EMF and current is derived, taking into account distribution and pitch factors
Relationships between rotor torque, rotor losses and slip indicating factors that affect torque are outlined
Significance of torque/slip curves for an induction motor is explained
Relationship between starting torque and applied voltage is established and consequences of this upon starting methods are outlined
Schematic circuit diagrams are prepared that illustrate the main features and applications of moving coil and moving iron voltmeters and ammeters
Schematic circuit diagrams are prepared that illustrate the main features and applications of air and iron cored dynamometer type wattmeters
Dangers associated with current and voltage transformers on high current and voltage systems are identified
Forms
Assessment Cover Sheet
MARL6001A - Apply intermediate principles of marine electrotechnology
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Assessment Record Sheet
MARL6001A - Apply intermediate principles of marine electrotechnology
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