Kingdom of Saudi Arabia
Ministry of Higher Education
Majmaah University
College of Engineering
Department: Electrical Engineering
Exam Information
Course code:
Instructor:
Section number:
Exam time:
Exam hall:
Number of pages:
First Exam
EE 372
Course Title: Power System Analysis
Dr. Praveen R.P.
798
Exam date:
9-11-2014
From:
8.00 am
To:
10.00 am
3D 25
5
Total score:
20 points
Student’s Information
Name:
ID:
Exam Instructions:
 Read the questions carefully and several times. Writing clearly will make
it possible to assess your answers correctly.
 Any form of cheating, intention to cheating, or disruption of the exam will
subject you to a disciplinary action as specified by the university’s
regulations.
 Carrying or using the mobile phone during the exam is not allowed. Using
the phone during the exam will carry a disciplinary action.
 The calculator is only permitted by the exam supervisor.
 No student can leave the exam room during the first half hour of the
exam. Any student coming after the first half hour of the exam will not be
permitted to enter the exam.
 A student leaving the exam, even for legitimate reasons, may not be given
a makeup exam.
Points Earned:
Question
1
2
3
Score
Question
4
5
6
Score
Total score in the exam:
Dear student, we encourage you to answer the exam the best you can and we
wish you all success.
1
Q1. Define per unit (p.u) value of a quantity and what are the advantages of p.u
computation in Power Systems?
(5 marks)
Q2. A 50 KW, 3 phase, Star Connected load is fed by a 200 KVA transformer with
voltage rating 11 KV/400V through a feeder. The length of the feeder is 0.5 km
and the impedance of the feeder is 0.1 + j 0.2 Ω/km. If the load power factor is
0.8, calculate the per unit impedance of the load and the feeder?
(5 marks)
2
3
Q3.
For the network shown in figure, form the Bus Admittance Matrix. Also
determine the reduced admittance matrix by eliminating node 4. The values are
marked in p.u?
(5 marks)
4
Q4. The voltage across a three phase unbalanced load are Va = 300∟20 V,
Vb = 360∟90 V and Vc = 500∟-140 V. Determine the symmetrical components
of voltages. Phase sequence is abc?
(5 marks)
5