Download GTU BE/B.Tech 2018 Winter 7th Sem Old 170901 Inter Connected Power System Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem Old 170901 Inter Connected Power System Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (OLD) EXAMINATION ? WINTER 2018
Subject Code: 170901 Date: 03/12/2018

Subject Name: Inter Connected Power System

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Explain the advantages and disadvantages of inter connected power system. 07
(b) Give the comparisons between NR-Method & G-S Method. 07

Q.2 (a) Explain the classification of bus. How slack bus is decided for Load flow study? 07
(b) Derive the equation for ? coefficient. 07
OR
(b) Derive the static load flow equations. 07

Q.3 (a) Explain the Y-bus formation using singular transformation method. 07
(b) Explain Islanding and describe the importance during black-out. 07
OR
Q.3 (a) Explain methods used for voltage control. 07
(b) Explain the speed governing system with neat diagram. 07

Q.4 (a) Explain clearly with a flow chart of computational procedure for load flow study
by G-S Method.
07
(b) A two pole, 50 Hz, 11kV turbo generator has a rating of 100MW, power factor
0.85 lagging. The rotor has a moment of inertial of 10,000kg-m
2
. Calculate H and
M.
07
OR
Q.4 (a) Discuss in brief the methods for improving transient stability 07
(b) Two generators rated 200 MW and 400 MW are operating in parallel. The droop
characteristics of their governors are 4% and 5% respectively from no load to full
load. The speed changers are so set that the generators operate at 50 Hz sharing
the full load of 600 MW in the ratio of their ratings. If the load reduces to 400
MW how will it be shared among the generators and what will the systems
frequency be? Assume free governor operation.
07

Q.5 (a) Explain tie-line load bias method of frequency control 07
(b) Prove that Md
2
?/dt
2
= Pm-Pe, Pm is mechanical power, Pe is electromagnetic
power and M is angular momentum
07
OR
Q.5 (a) Discuss procedure for solving the swing equation using point by point method. 07
(b) Describe unit commitment in detail. 07

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