AYA Electrical Power and Machines Sample Questions
By: Prof. Dr. Hany A. Abdelsalam
2023
(Lecture 1: Introduction)
1- Categorize the different elements of electrical power and machines.
(Lecture 2: DC Machines)
2- Explain the principle of operation of DC machines, generators, and motors.
3- Draw the DC motor equivalent circuit and write the corresponding voltage, power, and torque
equations. How are these different in DC generators?
4- Draw the circuit diagram of the speed control of the DC motor using pulse width modulation and
H-bridge. How can the motor speed be changed? (Summarize the MATLAB/Simulink Example)
5- Explain the three types of DC machines.
6- How can we select the suitable type of DC motors practically?
(Lecture 3: Three-Phase Induction Motors)
7- Explain the principle of operation of the three-phase induction motors.
8- Draw the equivalent circuit of the induction motor. (Self-learning)
9- Explain How to control the speed of the three-phase induction motors. (Summarize the
MATLAB/Simulink Example)
10- Write the equation relating the induction motor speed with its number of poles.
11- Study the examples solved in the lecture (powerpoint presentation).
12- Explain How the induction machine can work as a motor or generator. Use the torque-speed
characteristics plot.
(Lecture 4: Three-Phase Synchronous Generators)
13- Explain the principle of operation of the three-phase synchronous generators.
14- Explain How to control the armature voltage (output voltage) of the three-phase synchronous
generator.
15- Explain the coupling of synchronous generator with the exciter system. (Summarize the
MATLAB/Simulink Example)
16- Show the effect of armature reaction in synchronous generator with the aid of waveforms and
phasor diagram.
17- What is the function of Synchronization in parallel operation of two synchronous machines.