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Power Systems Exam Guide

This document is an exam for a Power Systems 1 course, consisting of 5 questions with 3 parts each. Question 1 asks about the functions of components in steam and solar power stations, and the schematic of a hydro power station. Question 2 compares AC and DC systems, and asks about factors affecting transmission line sag and components of a wind energy system. Question 3 asks about transmission line components, string efficiency, and equations for sag under different conditions. Question 4 derives equations for capacitance and inductance, and asks about constants of overhead lines. Question 5 derives an expression for electric potential, asks about the effect of earth on capacitance, and compares outdoor and indoor substations.

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106 views2 pages

Power Systems Exam Guide

This document is an exam for a Power Systems 1 course, consisting of 5 questions with 3 parts each. Question 1 asks about the functions of components in steam and solar power stations, and the schematic of a hydro power station. Question 2 compares AC and DC systems, and asks about factors affecting transmission line sag and components of a wind energy system. Question 3 asks about transmission line components, string efficiency, and equations for sag under different conditions. Question 4 derives equations for capacitance and inductance, and asks about constants of overhead lines. Question 5 derives an expression for electric potential, asks about the effect of earth on capacitance, and compares outdoor and indoor substations.

Uploaded by

feyayel988
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Seat No.: ________ Enrolment No.

___________

GUJARAT TECHNOLOGICAL UNIVERSITY


BE - SEMESTER–IV (NEW) EXAMINATION – WINTER 2021
Subject Code:3140914 Date:28/12/2021
Subject Name:Power System- I
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.
4. Simple and non-programmable scientific calculators are allowed.

MARKS

Q.1 (A) For a steam power station, Describe functions of: 03


1) Air Pre Heater
2) Cooling Tower
3) Economizer.
(B) Explain working principle of solar photovoltaic cell 04
(C) Draw and explain neat schematic arrangement of Hydro power 07
station and discuss function of its constituents.

Q.2 (A) Compare AC and DC supply system. 03


(B) What are the factors that affect the sag in transmission line? 04
(C) Develop various components of wind energy conversion system 07
with diagram.
OR
(C) Explain in detail about Synchronous condenser method for power 07
factor improvement.
Q.3 (A) Name the important components of an overhead transmission line. 03
Give reasons for unequal potential distribution over a string of
suspension insulators.
(B) Define and explain string efficiency. Can its value be equal to 04
100%? Justify your answer.
(C) Define the sag in overhead line. Derive the equation of sag in case 07
of When supports are at equal and unequal level. Also find the sag
during effect of wind and ice loading.
OR
Q.3 (A) Compare the merits and demerits of underground system versus 03
overhead system.
(B) What are the properties of insulating material for cables? Name 04
some insulating materials used in cables.
(C) What do you understand by grading of underground cables? List the 07
methods of grading and explain any one of them in detail.
Q.4 (A) What do you mean by the constants of an overhead transmission 03
line?
(B) Derive the equation of Capacitance of a single phase line. 04

1
(C) Calculate the inductance per phase per metre for a three-phase
double-circuit line whose phase conductors have a radius of 5·3 cm
with the horizontal conductor arrangement as shown in Fig. 07

OR
Q.4 (A) Explain self GMD and mutual GMD. 03
(B) Derive expression for capacitance for single core cable. 04
(C) What is electric supply system? Draw a single line diagram of a 07
typical a.c. power supply system.
Q.5 (A) Derive an expression for electric potential at a charged single 03
conductor.
(B) What is the effect of earth on Transmission line capacitance? 04
(C) Classify the sub-stations according to service requirement and 07
constructional features. Compare outdoor substation and indoor
substation
OR
Q.5 (A) Enlist various equipment’s used in substation 03
(B) What is neutral grounding? List the advantages of Neutral 04
grounding.
(C) Explain arc suppression coil earthing in detail. 07

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