SKEE 4633 Mesin Elektrik Department of Energy Conversion, Universiti Teknologi Malaysia (UTM) 
Assignment #1 (Group Assignment) Answer all the questions given in this Tutorial Sheet. Descriptive Questions: Q1.With the help of appropriate equations and and diagram, discuss briefly the process of energy conversion occurs in a basic electromechanical system. Q2. With the help of appropriate equations and diagram, discuss briefly the production of torque in a singly excited electromechanical energy system based on the change of the field stored energy and coenergy. Q3. With
the help of an appropriate equation, discuss briefly the mechanism of
torque production in a doubly excited electromechanical
energy system. Due: 03/10/19 No. 1 to No. 6 Due: 10/10/19 No. 7 to No. 11 Including Descriptive Questions Sample of previous semester Assignment: Question: Click here! Answer: Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9 Assignment #2 (Group Assignment) Redo Examples 4.1  4.5. Use this graph paper for Figure 4.24. Click here! Descriptive Questions:
Q1. What is armature reaction? State and explain two main
methods to minimize the effect of armature reaction. Q2. State and explain the causes of voltage drops occur in
shunt DC generator. Q3. State and explain the conditions for voltage buildup in
shunt DC generator. Q4. Starting from e = Blv, derive an expression for the induced
voltage in a DC generator. Due: 24/10/18
Assignment #3 (Group Assignment) Redo Examples 4.6  4.10. Use this graph paper for Figure 4.24. Click here! Descriptive Questions: Q1. Why a starter is used for a DC motor? State and explain two main methods for starting DC motor. Q2.
Derive torquespeed equations for a separately excited DC motor and a
series DC motor. Plot their torquespeed charateristics and explain
their behaviour. Q3. State and explain three methods for controlling speed of DC motor. Highlight their pros and cons. Q4. Starting from f = Bli, derive an expression for the developed torque in a DC motor. Due: 7/11/19 Assignment #4 (Group Assignment) Redo Examples 5.1, 5.2, 5.4 and 5.5. Use the approximate equivalent circuit of IM. Descriptive Questions: Q1. With
the help of the simple stator winding diagrams, show the production of
the rotating magnetic field. What happen to the direction of rotor
rotation if the phase sequence of the three phase
winding is changed. Q2. Describe briefly the working principle of
threephase induction machine. Q3. Based on the approximate equivalent circuit of induction machine, write expressions for the torque produced by the motor
as a function of circuit parameters. Plot torquespeed characteristics of the induction motor. Label key quatities. Due: 21/11/19 Assignment #5 (Group Assignment) Problem 6.3 From the Textbook Q1. Sketch the equivalent circuit of synchronous
generator having X_{s}
synchronous reactance per phase with circuit parameters and electrical
variables fully labeled. Then, draw the phasor diagrams of the synchronous
generator for each of the following conditions: Q2. With
the help of phasor diagram, describe the
effect of the excitation on the synchronous generator behavior when the
generator real power output, frequency and terminal voltage
are constants. Q3. Explain briefly the test needed to be performed on the synchronous machine to obtain the synchronous reactance. Support your answer with the proper plots of the tests. No need to submitt 
