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Evidence Guide: MARL042 - Apply basic principles of marine electrotechnology

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

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

 

MARL042 - Apply basic principles of marine electrotechnology

What evidence can you provide to prove your understanding of each of the following citeria?

Explain how material properties affect resistance of electrical conductors

  1. Terms and symbols used in the formula for resistivity are used correctly
Terms and symbols used in the formula for resistivity are used correctly

Completed
Date:

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How resistance varies with changes in conductor length and cross-sectional area is outlined

Completed
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How resistance varies with temperature is outlined

Completed
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Calculations are performed that illustrate how material properties affect resistance of electrical conductors

Completed
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Apply Ohm’s Law to electrical circuits

  1. Main sources of electromagnetic field (EMF) are identified
Main sources of electromagnetic field (EMF) are identified

Completed
Date:

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Terms and symbols used in Ohm’s Law are used correctly

Completed
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Calculations are performed using Ohm’s Law to solve problems involving internal, external and variable resistances in both series and parallel circuits

Completed
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Calculations are performed to determine power required and/or energy expended by electrical devices

Completed
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Circuits for a Wheatstone bridge and a slide wire bridge are sketched and their application on a ship is outlined

Completed
Date:

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Calculations are performed dealing with resistances, currents and voltage drops in bridge circuits under null or balanced conditions

Completed
Date:

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Apply principles of electrolytic action to electrical cells

  1. How the theory of electrolytic disassociation when applied to common electrolytic solutions and electrode materials explains the generation of EMF from chemical sources, is outlined
How the theory of electrolytic disassociation when applied to common electrolytic solutions and electrode materials explains the generation of EMF from chemical sources, is outlined

Completed
Date:

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Primary cells are distinguished from secondary cells

Completed
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Calculations are performed to solve problems involving currents, voltage drops and terminal potential difference of cells connected to form batteries in series and in parallel

Completed
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How capacity of a battery is measured is explained

Completed
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Construction of typical batteries used in marine environments is outlined

Completed
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Apply principles of electromagnetism to EMF generation

  1. Form and properties of the magnetic fields surrounding single conductor and multi-turn solenoid coils when carrying an electrical current are compared and contrasted
Form and properties of the magnetic fields surrounding single conductor and multi-turn solenoid coils when carrying an electrical current are compared and contrasted

Completed
Date:

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Terms and symbols used in Faraday’s and Lenz’s laws of electromagnetic induction are used correctly

Completed
Date:

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Calculations are performed using Faraday’s and Lenz’s laws of electromagnetic induction to solve problems related to electromagnetism and EMF generation

Completed
Date:

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Fleming’s Right Hand Rule is outlined

Completed
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Explain operation of direct current (DC) rotating machinery

  1. Construction and methods of maintaining and repairing typical DC machines are illustrated
Construction and methods of maintaining and repairing typical DC machines are illustrated

Completed
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Principle wiring arrangements used with DC machines are outlined

Completed
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Action of the commutator in DC generators is outlined

Completed
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Significance of Back EMF (Eb) in the operation of DC motors is outlined

Completed
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Mathematical formulae are applied to show relationships between operational parameters of DC motors

Completed
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Calculations are performed to solve simple problems relating to power output and efficiency in DC. motors

Completed
Date:

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Explain operation of alternating current (AC) rotating machinery

  1. How three phase AC may be developed out of simple single phase AC is explained
How three phase AC may be developed out of simple single phase AC is explained

Completed
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Difference between Star and Delta connections is outlined

Completed
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How a three phase supply can generate a rotating magnetic field is explained

Completed
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Construction of an AC synchronous generator is outlined

Completed
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Construction of an AC induction motor is outlined

Completed
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Calculations are performed to show how driving torque is produced in an induction motor

Completed
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Explain parallel operation and load sharing of generator

  1. Load/voltage curves of AC and DC generators are compared
Load/voltage curves of AC and DC generators are compared

Completed
Date:

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Main requirements for satisfactory power sharing between both AC and DC generators are outlined

Completed
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Sequences that occur when load changes on two DC generators working in parallel without an equaliser connection are outlined

Completed
Date:

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Effect of varying power factors on the load/voltage curve of an AC generator is outlined

Completed
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Explain coupling and breaking connections between switchboard and distribution panels

  1. Construction, equipment and service of main switchboard and emergency switchboard and distribution panel are outlined
Construction, equipment and service of main switchboard and emergency switchboard and distribution panel are outlined

Completed
Date:

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Construction and operation principle of measuring instruments in main and emergency switchboards and distribution panels are outlined

Completed
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Construction and operation principle of circuit breakers and their tripping devices are outlined

Completed
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Procedures for restarting ship equipment after power supply failure are outlined

Completed
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Connection between main and emergency switchboards and necessary safeguards are outlined

Completed
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Procedures for changeover to shore-connection supply are outlined

Completed
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Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include:

assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices

identifying and applying relevant mathematical formulas and techniques to solve basic problems related to marine electrotechnology

identifying and interpreting numerical and graphical information, and performing mathematical calculations, such as resistance of electrical conductors, power output and efficiency in direct current (DC) motors, and driving torque in induction motors

identifying, collating and processing information required to perform basic calculations related to marine electrotechnology

performing accurate and reliable calculations

reading and interpreting written information needed to perform basic electrical calculations

solving problems using appropriate laws and principles.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

basic principles of marine electrotechnology

batteries

cables

circuit breakers

coupling, load sharing and changing over generators, including:

conditions for automatic start of emergency generator and starting methods

control systems for distribution for active and reactive power

excitation systems of generators

methods of synchronisation

power factor

principles of power management, including:

control of start-release of big consumers directly supplied from main switchboard

automatic three-step disconnection of non-essential power consumers

load depending start and stop of generator and automatic load sharing

protections for generators and diesel engines, including:

asymmetrical voltage and current

frequency and voltage stabilisation of shaft generators

open circuit, wire fault and earth-fault monitoring

overload

reverse power

short circuit

under and overvoltage

under and over frequency

safety systems of generators

voltage and frequency control systems

DC motors and rotating machinery

difference between alternating current (AC) and DC

distribution panels

electrical:

current

power

safety

units of measurement

electromagnetic:

force

induction

effective verbal, written and visual communication techniques

electrical theory, including:

electrical circuits

impedance and inductance

Kirchhoff's Law

Ohm’s Law

electrical motors including:

AC motor

DC motor

electrical motor starting methodologies

emergency switchboard

fundamentals of AC, including:

principles

rotating machinery

high voltage (HV)

lighting

main switchboard

measuring instruments for switchboards

operational parameters of DC motors, including:

current

flux density

torque

voltage

parallel circuits

power distribution systems, including:

distribution

insulation

transformers

principles of electromagnetism and electrolytic action

resistance

series circuits

shore connection

work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices.

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.