Module 19 Assignment 1

Advanced Diploma of

Industrial Automation

(DIA)

Module 19 Assignment Questions

Motor Protection, Control, and Maintenance

V8

Your Name: ......

ITH MODEL ANSWERS

Date: …………………….


General Instructions to candidates

  1. The best marks can be earned by giving concise brief answers that addresses the questions as put to you.
  2. The time indicated is tentative and is not meant to restrict your answers
  3. The main idea behind the use of assignment questions are for you the student to learn and understand the material by reading it and answering the questions as put. Cutting and pasting from internet sites or the study material does not enhance that learning process. However, appropriate diagrams can be pasted if you cannot draw them.
  4. Attempt ALL questions
  5. Use this document also for furnishing your answers by typing the answers after each question without deleting the question. Use this Microsoft Word document as it stands. Make sure that you preserve the original question number format and that you don’t change the question numbers by adding extra lines or deleting existing ones.
  6. Do not add extra pictures etc as Annexures but add the pictures and diagrams directly into this main answer sheet by pasting. Handrawn sketches can be inserted after scanning but please ensure that the assignment filesize does not become big (more than 10 MB).
  7. Refer in the text to diagrams and pictures etc that you have drawn or pasted in. Do not only paste them into the document without referring to them in the text.
  8. Finally when saving your document (must be WORD FORMAT), ensure you save the title to include your name : COURSECODE_MODULE#_ASSIGNMENT_VERSION#_YOURNAME

EgDME03_Module3_Assignment_v3_BOB_BROWN

  1. Please ensure that all answers must be in your own words. Copying and pasting is not allowed.
  2. Please ensure you sign and date the below statement to verify your assessment submission as your own material.

I certify that the attached assignment is my own work and that any material drawn from other sources has been acknowledged.

Copyright in assignments remains my property. I grant permission to the Engineering Institute of Technology (EIT) to make copies of assignments for assessment, review and/or record keeping purposes. I note that the EIT reserves the right to check my assignment for plagiarism. Should the reproduction of all or part of an assignment be required by the EIT for any purpose other than those mentioned above, appropriate authorization will be sought from me on the relevant form.

Please place an ‘X’ in the box below to indicate that you have read, understood and certify the above statement. Please include this page in/with your submission. Any electronic responses to this submission will be sent to your Moodle account.
AGREEMENT DATE:

Total marks = 100 Time allowed: 2 hours

  1. Describe the similarities and differences between the three different types of polyphase AC motors.

(10 marks)

  1. Describe five (5) benefits of using a 3-phase motor compared to a single-phase motor.

(10 marks)

  1. Sketch the torque speed curve of an induction motor and identify the following points on the graph:
  • Breakaway starting Torque
  • Pull-up Torque
  • Pull-out Torque
  • Full load Torque

(10 marks)

  1. What are the three (3) main components of a DC motor? Explain each component.

(10 marks)

  1. What are the main losses in an induction motor (name and briefly explain) and how the efficiency is calculated?

(5 marks)

  1. List and explain the seven (7) parameters that must be monitored to ensure the motor is in good condition.

(5 marks)

  1. List and explain the four (4) parameters that must be monitored to ensure motor bearings are in good condition.

(10 marks)

  1. List and explain the parameters that can cause insulation failure in an electric motor.

(10 marks)

  1. What are the six (6) features of ideal motor protection relays?

(5 marks)

  1. What are the four (4) main areas of a typical VSD control system?

(5 marks)

  1. List and explain the mechanical failures and auxiliary failures in an electric motor.

(10 marks)

  1. What are the three (3) common cabling errors made when installing VSD’s?

(10 marks)

FILE PATH NAME: egAdvanced_Diploma_Assignment_Coverpage_Template_v2.1.doc