Recognize a variety of complex wave forms and explain how they are produced from sinusoidal wave forms.

LEARNER’S NAME:

PROGRAMME TITLE: BTEC LEVEL 4 HNC DIPLOMA IN MECANICAL ENGINEERING

UNIT No. & TITLE: 2: ENGINEERING SCIENCE

ASSIGNMENT No. & TITLE: 4: AC THEORY

ISSUE DATE:
SUBMISSION DATE: DEADLINE MET: (Y/N)

PRE-CHECKED BY:
(sign & date) S Whiting
ASSESSED BY:
(sign & date) S. Quail
FEEDBACK INTERNALLY VERIFIED BY:
(sign & date) S Whiting

Criteria Assessed 4.1 4.2 4.3
Criteria Achieved ()

LEARNING OUTCOMES/ASSESSMENT CRITERIA/PROGRAMME SPECIFICATION
Outcome 4: Apply AC theory to solve electrical and electronic engineering problems
4.1 Recognize a variety of complex wave forms and explain how they are produced from sinusoidal wave forms
4.2 Apply AC theory to solve problems on R, L, C circuits and components
4.3 Apply AC theory to solve problems involving transformers
A1 Review and select appropriate techniques, procedures and methods to undertake tasks
A2 Use appropriate scientific, technical or engineering principles

Learners signature: To confirm all work submitted is your own and research sources are fully acknowledged

ASSIGNMENT DESCRIPTION
This assignment comprises realistic engineering problems of the type you may face if you were a member of your company’s engineering design team. This assignment gives you the opportunity to demonstrate understanding of the principles applied to AC electrical systems, used in practical engineering situations.

The unit outcomes assessed are detailed on the assignment header sheet. Read them through carefully & with the help of your tutor if necessary, ensure that you understand what you need to do to achieve the pass, merit and distinction criteria.

TASKS TO BE COMPLETED
After each topic area you will attempt the associated assignment comprising a variety of appropriate practical problems. You will be given at least one lesson of class time per assignment but will be expected to complete it in your own time. This will be the 4th of 4 such assignments. Once submitted your work will be marked and handed back within 2 weeks. Your feedback, written on the assessment evidence and feedback sheet, will justify an indicative grade for the work submitted using the criteria listed.

WHAT YOU NEED TO HAND IN
You need to submit your solutions in a neatly presented manner on the negotiated date.

INTENDED LEARNING OUTCOMES
The front cover of this assignment identifies the Competence and Commitment Standards for Engineering Technicians (UK SPEC) that are incorporated in this assignment. In addition it follows the guidelines laid out in the Code of Practice for the Assurance of Academic Quality and Standards in Higher Education (Section 6: Assessment of students).

The aims of this programme are to enable candidates to learn about the scientific principles and mathematical techniques used in the area of modern engineering, and also to develop mechanical-based engineering solutions to everyday problems. By carrying out the tasks in this assignment you will have the opportunity to gain knowledge and understanding of:

A1: Review and select appropriate techniques, procedures and methods to undertake tasks.
A2: Use appropriate scientific, technical or engineering principles.
Refer to your student handbook for further information on the programme specification.
ASSIGNMENT FEEDBACK

While you are undertaking an assessment, your tutor will continue to give general feedback and support, particularly around the development of knowledge, understanding and skills. When you are undertaking assignment work in class, your tutor will be available for guidance. It is important to emphasise that the work produced must be your own, either in or outside class. The tutor will give you formative feedback, either verbally or in writing while you are undertaking assignment. Once an assignment has been formally assessed, summative feedback will be given on which criteria you have achieved and not achieved with clear reasons why so you can learn and progress.

Because every assignment contributes to the final qualification grade, it may be appropriate for the Lead Internal Verifier to authorise one opportunity for you to resubmit evidence to meet assessment criteria targeted by an assignment. The Lead Internal Verifier can only authorise a resubmission if all of the following conditions are met:
You have met initial deadlines set in the assignment, or you have met an agreed deadline extension.
Your tutor judges that you will be able to provide improved evidence without further guidance.
Your assessor has authenticated the evidence submitted for assessment and the evidence is accompanied by a signed-and-dated declaration of authenticity by you.

If the Lead Internal Verifier does authorise a resubmission, it must be:
Recorded on your assessment form.
Given a deadline for resubmission within 10 working days (within term time and the same academic year) of you receiving the results of the assessment.
Undertaken by you with no further guidance.

You can achieve the assessment evidence for P4 by completing the problems below:

A simple ac waveform is described by the equation:

Determine:
The maximum voltage;
The peak to peak voltage;
The RMS voltage;
The angular frequency in rad/s;
The frequency;
The periodic time;
The phase angle in degrees and radians;
Sketch the waveform.

A coil of inductance 318.3 mH is connected in series with a 200 resistor to a 240V/50Hz supply. Calculate:
The inductive reactance of the coil;
The impedance of the circuit;
The current in the circuit;
The voltage across each component;
The circuit phase angle;
The true power;
The resonant frequency if a 50nF capacitor was added to the circuit.

NOTES FOR PEER ASSESSORS

Ensure the header sheet has been completed correctly:
Learners name written in BLOCK CAPITALS.
Submission date entered.
Peer assessors signature/date entered.
Learner’s signature to confirm own work.

Ensure that the evaluation sheet has been completed.

Ensure that you do not miss any errors or omissions when peer assessing your allocated assignment. Any errors or omissions you miss will be added to your personal total. Mark as an error if:
The incorrect formula has been used.
The transposition of the formula is incorrect.
The final answer is incorrect.
The final units are incorrect.
The graph is incorrect.
Mark as an omission if:
Workings have been omitted.
There is not a list of information from the question.
There is a large decimal error.
Units have not been stated.
SF/DP has not stated.
Any detail is missing from the graph.

All solutions should:
Include a list of the information obtained from the question, written with the correct symbols and units.
Be laid out in a neat manner and show all appropriate workings and prefix conversions. Work down the page with all equal signs in line.
Terminate each calculation with the correct numerical value and include the correct units, expressed to a sensible level of accuracy (Decimal places or significant figures).

All graphical solutions should:
Be plotted correctly using an appropriate scale.
Have a suitable title.
Have fully labelled axes.
Include any additional useful information.

ASSESSMENT EVIDENCE & FEEDBACK

THIS SECTION TO BE COMPLETED BY THE PEER ASSESSOR
OUTCOME/CRITERIA Evidence Task Errors Omissions
P4.1: Recognise a variety of complex waveforms and explain how they are produced from sinusoidal waveforms
P4.2: Apply AC theory to solve problems on R, L, C circuits and components Appropriate solution to question 1

Appropriate solution to question 2 Q1
Q2
OTHER
Total Errors & Omissions

THIS SECTION TO BE COMPLETED BY THE TUTOR
Grade descriptors To achieve the grade descriptor you will need to ensure that:
M2: Select/design and apply appropriate methods/techniques All have been formulae transposed correctly.
Solutions are structured with appropriate workings.
Final answers are expressed to an appropriate accuracy with the correct SI unit.

D2: Take responsibility for managing and organising activities
Both problems have been solved with no errors & no or minor omissions and with minimal assistance from the tutor. 0: No /minimal assistance
1: Some assistance
2: Excessive assistance

In addition to the PASS criteria, this assignment gives you the opportunity to submit evidence to achieve the following MERIT and DISTINCTION grades
Grade descriptor Indicative Characteristic/s Contextualisation
M1: Identify and apply strategies to find appropriate solutions Not Applicable. Not Applicable.
M2: Select/design and apply appropriate methods/techniques Not Applicable. Not Applicable.
M3: Present and communicate appropriate findings Not Applicable. Not Applicable.
D1: Use critical reflection to evaluate own work and justify valid conclusions Not Applicable Not Applicable
D2: Take responsibility for managing and organising activities Not Applicable Not Applicable
D3: Demonstrate convergent/lateral/ creative thinking Problems have been solved. Not Applicable

NB: The grade descriptors and the indicative characteristics are detailed in Annexe C of the HN specifications. The indicative characteristics need to be contextualised according to the assignment or task content. Only one indicative characteristic per grade descriptor is required.
ASSIGNMENT FEEDBACK
Learner Comments:

Summative Feedback (with actions if criteria have not been met):

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