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Council for Technical Education and Vocational Training{{CTEVT}}
Office of the Controller of Examinations
Sanothimi, Bhaktapur
Regular/ Back Exam-2079 Chaitra/ 2080 Baisakh
Full Marks: 80
Pass Marks: 32
Program: Diploma in Electrical & Electronics / Electrical Engg.
Year/Part: II/I (2014)
Subject: Power Stations
Time: 3 hrs.
Candidates are required to give their answers in their own words as far as practicable.The figures in the margin indicate full marks.
Attempt any FIVE questions.
1. a. Explain the schematic layout of modern power system with single line diagram. (8)
b. Why standard voltage and frequency is necessary in electrical power system? (8)
2. a. Why electrical energy is more advantageous as compared to other form of energy? Explain peak load power plant. (4+4)
b. Explain in brief about working principle of diesel clectric power plant with diagram. (8)
3. a. What are the major steps for starting hydroelectric powerplant? How it is connected to grid? (8)
b. Explain operating principle of Pelton and Francis water turbines. List out few hydropower plants of Nepal where these turbines are in use. (8)
4. a. What are the major advantages of high transmission over low voltage transmission? (8)
b. What do you understand by excitation system? Explain in brief about brushless excitation system. (8)
5. a. Draw single line of 66 KVkV substation line diagram of showing major equipment for protection and measurement. (8)
b. Explain the operation of ring main bus bar system with diagram. (8)
6. Write short notes on: (any TWO) (8×2)
a. Surge Tank
b. Plant Capacity Factor and Plant Utilization Factor
c. Circuit Breaker
d. Basic Concept of PLCC and SCADA system
Good Luck!
