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Max. Marks: 100

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01057 Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SEVENTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2018

Course Code: EE405
Course Name: Electrical System Design

PARTA

Answer all questions, each carries 5 marks.
Why it is necessary to have pre-commissioning tests of electrical installations.
Specify a circuit breaker having both short circuit and overload protection. Explain its
difference between MCB and ELCB.
Draw the single line diagram of an indoor substation showing all accessories of the
system.
List out different types of transformer tests carried out before commissioning.
A certain incandescent lamp, hangs from the ceiling of a room. The illuminance
received on a small horizontal screen lying on a bench 2m vertically below the lamp
is 63.5 lux. Calculate illuminance at a point when the screen is moved horizontally a
distance of 1.5m along the bench.
Mention the features of good lighting scheme for buildings?
What are the various energy conservation techniques imposed in buildings?
Briefly explain need of a solar PV system for domestic application.

PART छ
Answer any two full questions, each carries 10 marks.

What are the steps to be followed for safety precautions against electric shock?
Describe electric service in buildings.

What are different protective devices used in domestic installation? Explain each one
in detail.
Describe the selection procedure for ELCB for domestic and industrial dwelling.

Design an electrical schematic for the residential building with following details.

Locate the positions of meter board, Main Switch board, DB, switch boards.

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Duration: 3 Hours

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