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Evidence Guide: MARL014 - Apply intermediate 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

 

MARL014 - Apply intermediate principles of marine electrotechnology

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

Apply concepts of resistivity, resistance and capacitance to series and parallel AC and DC circuits

  1. Calculations are performed to solve problems related to resistance, voltage drop, current and power in series and parallel circuits
  2. Calculations are performed to solve problems related to temperature coefficient of resistance and change of resistance of a conductor with a change of temperature
  3. Basic relationships that give total equivalent capacitance for capacitors arranged in series and parallel combinations are derived
  4. Relationships that give total equivalent capacitance to solve numeric problems involving alternating current (AC) and direct current (DC) circuits are applied
Calculations are performed to solve problems related to resistance, voltage drop, current and power in series and parallel circuits

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations are performed to solve problems related to temperature coefficient of resistance and change of resistance of a conductor with a change of temperature

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Basic relationships that give total equivalent capacitance for capacitors arranged in series and parallel combinations are derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationships that give total equivalent capacitance to solve numeric problems involving alternating current (AC) and direct current (DC) circuits are applied

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Explain how principles of electrolytic action apply to electrical cells and batteries

  1. Kirchhoff’s circuit laws are explained
  2. 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
  3. Calculations to solve secondary cell charging and discharging problems are performed
  4. Calculations to solve problems related to the efficiency of cells are performed
Kirchhoff’s circuit laws are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations to solve secondary cell charging and discharging problems are performed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations to solve problems related to the efficiency of cells are performed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse a magnetic circuit

  1. Key parameters of magnetic circuits are identified
  2. 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
  3. 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
  4. How a magnetic circuit may be created by using a toroidal core within the solenoid coil is demonstrated
  5. Calculations to solve problems relating to magnetic circuits using different materials in different parts of their cores, including air gaps, are performed
  6. Effect on flux density of applying an alternating magnetising force to an iron core is shown diagrammatically
Key parameters of magnetic circuits are identified

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

How a magnetic circuit may be created by using a toroidal core within the solenoid coil is demonstrated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations to solve problems relating to magnetic circuits using different materials in different parts of their cores, including air gaps, are performed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Effect on flux density of applying an alternating magnetising force to an iron core is shown diagrammatically

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Interpret electromagnetic consequences of a conductor moving relative to a magnetic field

  1. Faraday’s and Lenz’s Laws are applied to solve problems relating to the electromagnetic induction of EMF and current
  2. 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
  3. How alternating electrical quantities may be represented by rotating phasors is illustrated and explained
  4. Relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities is derived
  5. Mathematical problems are solved by applying relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities
Faraday’s and Lenz’s Laws are applied to solve problems relating to the electromagnetic induction of EMF and current

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

How alternating electrical quantities may be represented by rotating phasors is illustrated and explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities is derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Mathematical problems are solved by applying relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse circuits that incorporate combinations of resistive, inductive, and capacitive elements

  1. Time constant for different circuit combinations subjected to DC EMF’s is defined
  2. 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
  3. Differentiation is made between inductive reactance, capacitive reactance and impedance as applied to AC circuits
  4. Effects of inductive and capacitive reactance upon phasor relationships between applied AC voltage and current are shown
  5. 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
  6. Power factor is defined and concepts of real and reactive power usage are applied to solution of problems involving RL and RC elements
Time constant for different circuit combinations subjected to DC EMF’s is defined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Differentiation is made between inductive reactance, capacitive reactance and impedance as applied to AC circuits

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Effects of inductive and capacitive reactance upon phasor relationships between applied AC voltage and current are shown

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Power factor is defined and concepts of real and reactive power usage are applied to solution of problems involving RL and RC elements

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse operation of polyphase AC circuits

  1. How three phase AC may be developed out of simple single phase AC is explained
  2. Voltage and current relationships between line and phase in both Star and Delta 3 phase connections are derived
  3. Standard Star to Delta and Delta to Star conversion relationships for current and voltage are derived
  4. Numeric problems involving both balanced and unbalanced circuit loads are solved
  5. Relationships between kW, kVA and kVAr for 3 phase AC circuits is derived
  6. Calculations are performed using the relationship between kW, kVA and kVAr to solve problems in 3 phase AC circuits
How three phase AC may be developed out of simple single phase AC is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Voltage and current relationships between line and phase in both Star and Delta 3 phase connections are derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Standard Star to Delta and Delta to Star conversion relationships for current and voltage are derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Numeric problems involving both balanced and unbalanced circuit loads are solved

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationships between kW, kVA and kVAr for 3 phase AC circuits is derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations are performed using the relationship between kW, kVA and kVAr to solve problems in 3 phase AC circuits

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Describe basic operating principles of shipboard DC machinery

  1. Schematic circuits are prepared for separately excited, series, shunt and compound connected generators and motors to illustrate wiring arrangements used with DC machines
  2. EMF equation for a DC generator to solve shipboard problems is applied
  3. Torque equation for a DC motor to solve shipboard problems is applied
  4. Expression linking back EMF parameters for a DC motor is derived and used to solve shipboard problems
  5. Various losses that can occur in DC motors and generators are calculated
Schematic circuits are prepared for separately excited, series, shunt and compound connected generators and motors to illustrate wiring arrangements used with DC machines

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

EMF equation for a DC generator to solve shipboard problems is applied

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Torque equation for a DC motor to solve shipboard problems is applied

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Expression linking back EMF parameters for a DC motor is derived and used to solve shipboard problems

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Various losses that can occur in DC motors and generators are calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Perform calculations related to operation of AC generators

  1. Construction features of the AC synchronous generator are explained
  2. EMF equation for an AC generator is derived, taking into account distribution and pitch factors
  3. Expression for the magnitude and speed of the rotating flux generated by a three-phase supply is derived
  4. Voltage regulation for synchronous generator is defined
  5. Effect of power factor on load characteristic of an AC generator is illustrated
Construction features of the AC synchronous generator are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

EMF equation for an AC generator is derived, taking into account distribution and pitch factors

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Expression for the magnitude and speed of the rotating flux generated by a three-phase supply is derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Voltage regulation for synchronous generator is defined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Effect of power factor on load characteristic of an AC generator is illustrated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Perform calculations related to operation of three-phase AC induction motors

  1. Construction features of the AC induction motor are explained
  2. Expression for slip of an induction motor rotor is derived and applied to frequency of its rotor EMF and current
  3. Expression for magnitude of rotor EMF and current is derived, taking into account distribution and pitch factors
  4. Relationships between rotor torque, rotor losses and slip indicating factors that affect torque are outlined
  5. Significance of torque/slip curves for an induction motor is explained
  6. Relationship between starting torque and applied voltage is established and consequences of this upon starting methods are outlined
Construction features of the AC induction motor are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Expression for slip of an induction motor rotor is derived and applied to frequency of its rotor EMF and current

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Expression for magnitude of rotor EMF and current is derived, taking into account distribution and pitch factors

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationships between rotor torque, rotor losses and slip indicating factors that affect torque are outlined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Significance of torque/slip curves for an induction motor is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationship between starting torque and applied voltage is established and consequences of this upon starting methods are outlined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Explain operating principles of basic electrical instrumentation

  1. Schematic circuit diagrams are prepared that illustrate the main features and applications of moving coil and moving iron voltmeters and ammeters
  2. Schematic circuit diagrams are prepared that illustrate the main features and applications of air and iron cored dynamometer type wattmeters
  3. Dangers associated with current and voltage transformers on high current and voltage systems are identified
Schematic circuit diagrams are prepared that illustrate the main features and applications of moving coil and moving iron voltmeters and ammeters

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Schematic circuit diagrams are prepared that illustrate the main features and applications of air and iron cored dynamometer type wattmeters

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Dangers associated with current and voltage transformers on high current and voltage systems are identified

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Apply concepts of resistivity, resistance and capacitance to series and parallel AC and DC circuits

1.1

Calculations are performed to solve problems related to resistance, voltage drop, current and power in series and parallel circuits

1.2

Calculations are performed to solve problems related to temperature coefficient of resistance and change of resistance of a conductor with a change of temperature

1.3

Basic relationships that give total equivalent capacitance for capacitors arranged in series and parallel combinations are derived

1.4

Relationships that give total equivalent capacitance to solve numeric problems involving alternating current (AC) and direct current (DC) circuits are applied

2

Explain how principles of electrolytic action apply to electrical cells and batteries

2.1

Kirchhoff’s circuit laws are explained

2.2

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

2.3

Calculations to solve secondary cell charging and discharging problems are performed

2.4

Calculations to solve problems related to the efficiency of cells are performed

3

Analyse a magnetic circuit

3.1

Key parameters of magnetic circuits are identified

3.2

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

3.3

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

3.4

How a magnetic circuit may be created by using a toroidal core within the solenoid coil is demonstrated

3.5

Calculations to solve problems relating to magnetic circuits using different materials in different parts of their cores, including air gaps, are performed

3.6

Effect on flux density of applying an alternating magnetising force to an iron core is shown diagrammatically

4

Interpret electromagnetic consequences of a conductor moving relative to a magnetic field

4.1

Faraday’s and Lenz’s Laws are applied to solve problems relating to the electromagnetic induction of EMF and current

4.2

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

4.3

How alternating electrical quantities may be represented by rotating phasors is illustrated and explained

4.4

Relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities is derived

4.5

Mathematical problems are solved by applying relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities

5

Analyse circuits that incorporate combinations of resistive, inductive, and capacitive elements

5.1

Time constant for different circuit combinations subjected to DC EMF’s is defined

5.2

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

5.3

Differentiation is made between inductive reactance, capacitive reactance and impedance as applied to AC circuits

5.4

Effects of inductive and capacitive reactance upon phasor relationships between applied AC voltage and current are shown

5.5

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

5.6

Power factor is defined and concepts of real and reactive power usage are applied to solution of problems involving RL and RC elements

6

Analyse operation of polyphase AC circuits

6.1

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

6.2

Voltage and current relationships between line and phase in both Star and Delta 3 phase connections are derived

6.3

Standard Star to Delta and Delta to Star conversion relationships for current and voltage are derived

6.4

Numeric problems involving both balanced and unbalanced circuit loads are solved

6.5

Relationships between kW, kVA and kVAr for 3 phase AC circuits is derived

6.6

Calculations are performed using the relationship between kW, kVA and kVAr to solve problems in 3 phase AC circuits

7

Describe basic operating principles of shipboard DC machinery

7.1

Schematic circuits are prepared for separately excited, series, shunt and compound connected generators and motors to illustrate wiring arrangements used with DC machines

7.2

EMF equation for a DC generator to solve shipboard problems is applied

7.3

Torque equation for a DC motor to solve shipboard problems is applied

7.4

Expression linking back EMF parameters for a DC motor is derived and used to solve shipboard problems

7.5

Various losses that can occur in DC motors and generators are calculated

8

Perform calculations related to operation of AC generators

8.1

Construction features of the AC synchronous generator are explained

8.2

EMF equation for an AC generator is derived, taking into account distribution and pitch factors

8.3

Expression for the magnitude and speed of the rotating flux generated by a three-phase supply is derived

8.4

Voltage regulation for synchronous generator is defined

8.5

Effect of power factor on load characteristic of an AC generator is illustrated

9

Perform calculations related to operation of three-phase AC induction motors

9.1

Construction features of the AC induction motor are explained

9.2

Expression for slip of an induction motor rotor is derived and applied to frequency of its rotor EMF and current

9.3

Expression for magnitude of rotor EMF and current is derived, taking into account distribution and pitch factors

9.4

Relationships between rotor torque, rotor losses and slip indicating factors that affect torque are outlined

9.5

Significance of torque/slip curves for an induction motor is explained

9.6

Relationship between starting torque and applied voltage is established and consequences of this upon starting methods are outlined

10

Explain operating principles of basic electrical instrumentation

10.1

Schematic circuit diagrams are prepared that illustrate the main features and applications of moving coil and moving iron voltmeters and ammeters

10.2

Schematic circuit diagrams are prepared that illustrate the main features and applications of air and iron cored dynamometer type wattmeters

10.3

Dangers associated with current and voltage transformers on high current and voltage systems are identified

Required Skills and Knowledge

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Apply concepts of resistivity, resistance and capacitance to series and parallel AC and DC circuits

1.1

Calculations are performed to solve problems related to resistance, voltage drop, current and power in series and parallel circuits

1.2

Calculations are performed to solve problems related to temperature coefficient of resistance and change of resistance of a conductor with a change of temperature

1.3

Basic relationships that give total equivalent capacitance for capacitors arranged in series and parallel combinations are derived

1.4

Relationships that give total equivalent capacitance to solve numeric problems involving alternating current (AC) and direct current (DC) circuits are applied

2

Explain how principles of electrolytic action apply to electrical cells and batteries

2.1

Kirchhoff’s circuit laws are explained

2.2

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

2.3

Calculations to solve secondary cell charging and discharging problems are performed

2.4

Calculations to solve problems related to the efficiency of cells are performed

3

Analyse a magnetic circuit

3.1

Key parameters of magnetic circuits are identified

3.2

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

3.3

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

3.4

How a magnetic circuit may be created by using a toroidal core within the solenoid coil is demonstrated

3.5

Calculations to solve problems relating to magnetic circuits using different materials in different parts of their cores, including air gaps, are performed

3.6

Effect on flux density of applying an alternating magnetising force to an iron core is shown diagrammatically

4

Interpret electromagnetic consequences of a conductor moving relative to a magnetic field

4.1

Faraday’s and Lenz’s Laws are applied to solve problems relating to the electromagnetic induction of EMF and current

4.2

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

4.3

How alternating electrical quantities may be represented by rotating phasors is illustrated and explained

4.4

Relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities is derived

4.5

Mathematical problems are solved by applying relationships between instantaneous, maximum, average and RMS values of sinusoidally alternating electrical quantities

5

Analyse circuits that incorporate combinations of resistive, inductive, and capacitive elements

5.1

Time constant for different circuit combinations subjected to DC EMF’s is defined

5.2

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

5.3

Differentiation is made between inductive reactance, capacitive reactance and impedance as applied to AC circuits

5.4

Effects of inductive and capacitive reactance upon phasor relationships between applied AC voltage and current are shown

5.5

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

5.6

Power factor is defined and concepts of real and reactive power usage are applied to solution of problems involving RL and RC elements

6

Analyse operation of polyphase AC circuits

6.1

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

6.2

Voltage and current relationships between line and phase in both Star and Delta 3 phase connections are derived

6.3

Standard Star to Delta and Delta to Star conversion relationships for current and voltage are derived

6.4

Numeric problems involving both balanced and unbalanced circuit loads are solved

6.5

Relationships between kW, kVA and kVAr for 3 phase AC circuits is derived

6.6

Calculations are performed using the relationship between kW, kVA and kVAr to solve problems in 3 phase AC circuits

7

Describe basic operating principles of shipboard DC machinery

7.1

Schematic circuits are prepared for separately excited, series, shunt and compound connected generators and motors to illustrate wiring arrangements used with DC machines

7.2

EMF equation for a DC generator to solve shipboard problems is applied

7.3

Torque equation for a DC motor to solve shipboard problems is applied

7.4

Expression linking back EMF parameters for a DC motor is derived and used to solve shipboard problems

7.5

Various losses that can occur in DC motors and generators are calculated

8

Perform calculations related to operation of AC generators

8.1

Construction features of the AC synchronous generator are explained

8.2

EMF equation for an AC generator is derived, taking into account distribution and pitch factors

8.3

Expression for the magnitude and speed of the rotating flux generated by a three-phase supply is derived

8.4

Voltage regulation for synchronous generator is defined

8.5

Effect of power factor on load characteristic of an AC generator is illustrated

9

Perform calculations related to operation of three-phase AC induction motors

9.1

Construction features of the AC induction motor are explained

9.2

Expression for slip of an induction motor rotor is derived and applied to frequency of its rotor EMF and current

9.3

Expression for magnitude of rotor EMF and current is derived, taking into account distribution and pitch factors

9.4

Relationships between rotor torque, rotor losses and slip indicating factors that affect torque are outlined

9.5

Significance of torque/slip curves for an induction motor is explained

9.6

Relationship between starting torque and applied voltage is established and consequences of this upon starting methods are outlined

10

Explain operating principles of basic electrical instrumentation

10.1

Schematic circuit diagrams are prepared that illustrate the main features and applications of moving coil and moving iron voltmeters and ammeters

10.2

Schematic circuit diagrams are prepared that illustrate the main features and applications of air and iron cored dynamometer type wattmeters

10.3

Dangers associated with current and voltage transformers on high current and voltage systems are identified

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

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

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

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

identifying and interpreting numerical and graphical information, and performing mathematical calculations such as the relationship between starting torque and applied voltage in three phase AC induction motors

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

performing accurate and reliable mathematical calculations using a calculator

reading and interpreting written information needed to perform intermediate 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, performance criteria and range of conditions and include knowledge of:

AC induction motors

AC principles

batteries

circuit diagrams

DC motors

difference between AC and DC

effective verbal, written and visual communication strategies

electrical:

current

power

units of measurement

electromagnetic:

force

induction

Faraday’s and Lenz’s Laws of Electromagnetic Induction

intermediate electrical circuits

intermediate principles of marine electrotechnology

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

WHS/OHS requirements and work practices.

Range Statement

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

Key parameters of magnetic circuit include one or more of the following:

current

flux

flux density

magnetising force

magneto motive force

Circuit combinations must include:

resistive/capacitive

resistive/inductive

Losses include one or more of the following:

copper losses

iron losses or magnetic losses

mechanical losses