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:

(add new lines for each of the assessment tasks)

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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