ELECTRICAL DISTRIBUTION SYSTEMS JNTU previous years question papers

ELECTRICAL DISTRIBUTION SYSTEMS JNTU previous years question papers

Time: 3 hours Max Marks: 80

Answer any FIVE Questions.

All Questions carries equal marks.

1.a] Explain the following:
i] coincidence factor
ii] contribution factor
iii] loss factor
b] Write in detail about Residential and industrial loads and their respective characteristics. [8+8]

2.a] Define the terms : (i) feeder and (ii) Distributor.
b] State the differences between primary and secondary distribution lines as regards to voltage used, load carried, number of conductors and size of insulators. [8+8]

3.a] Compare the radial ,loop and ring main primary distribution systems on the basis of load ,reliability of supply and economy.
b] How do you optimally locate the substations and explain the benefits derived from optimal location. [8+8]

4.a] Derive an expression for voltage drop in a three phase ac distributor.
b] Elctrical energy is supplied to a consumer from a substation at a distance of 250m.If the power required by the consumer is three phase 100KW at 415 v unity pf and resistance of single conductor of the connecting cable is 0.1/1000O/m,calculate.
(i) the voltage at the bus bar of the substation
(ii) the power lossi nthe cable. [8+8]

5.a] What are the objectives of distribution system protection.
b] Explain in detail about line sectionalizers.
c] Explain the principle of operation of circuit breakers employed for distribution systems. [5+5+6]

6.a] What is the need for coordination ? Explain in detail.
b] Explain the overall coordination procedure employed for protection of distribution systems.

7.a] What are the effects of shunt and series capacitors in distributions systems?
b] Explain the procedure employed to determine the best capacitor location. [8+8]

8.a] How an AVR can control voltage? With the aid of suitable diagram explain its function.
b] Briefly explain about line drop compensation

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