B.TECH - Semester 8 electrical system design Question Paper 2013 (apr)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Explain labeling of Bureau of Energy efficiency.
- Explain the role of National Electric Code in the design of electrical installations.
- Explain different types of lighting arrangement.
- Explain step, touch and transfer potential.
- Load in a consumer's installation is divided into sub-circuits. Why?
- Explain the earthing arrangement used in outdoor substation.
- Explain how the ratings of cables and fuses are decided for motor installation.
- Explain the pre-commissioning tests of cables.
- What are the design considerations for the electrification of high rise buildings?
- Write short notes on the design of electrical system in lifts. ( $10 \times 2=20$ Marks) P.T.O.
- (a) Explain the design aspects of electrical installations in domestic buildings. 10
- (b) Briefly explain the electrical services in building. 7
- (c) Explain the IS standards IS 2675.
- (a) Design an electrical installation and draw the layout of a domestic building having following details. Also prepare an estimate of materials with cost
- Drawing room - $4 \mathrm{~m} \times 3.5 \mathrm{~m}$
- Dining room - $4 \mathrm{~m} \times 3 \mathrm{~m}$
- Bed room - $3.5 \mathrm{~m} \times 3.5 \mathrm{~m}$
- Kitchen $-3.5 \mathrm{~m} \times 3 \mathrm{~m}$
- Toilet (common) $-1.5 \mathrm{~m} \times 1.2 \mathrm{~m}$
- Sit out $-4 \mathrm{~m} \times 1.5 \mathrm{~m}$ (b) Explain MCB and ELCB.
- (a) Draw the layout of an $11 \mathrm{kV} / 433 \mathrm{~V}$ Distribution transformer with all accessories with specification.
- (b) Write a note on selection criteria for stand by generators. OR
- A small workshop has to be equipped with the following machinery : (a) One $5 \mathrm{hp}, 415 \mathrm{~V}, 3$ phase motor
- A small workshop has to be equipped with the following machinery : (b) One $3 \mathrm{hp}, 415 \mathrm{~V}, 3$ phase motor
- A small workshop has to be equipped with the following machinery : (c) One $1 \mathrm{hp}, 415 \mathrm{~V}, 3$ phase motor
- A small workshop has to be equipped with the following machinery : (d) One $1 / 2 \mathrm{hp}, 230 \mathrm{~V}$, single phase motor Prepare the estimate of the quantity of materials required and its cost with a layout of the wiring. The plan of the ...
- (a) Design and estimate the materials required for the electrical installation of a cinema theatre of 1000 seating capacity.
- (b) Explain pipe earthing and plate earthing with the help of neat sketches.
- (a) Fault current anticipated in a location is 8000 A . Resistivity of soil is given as $10 \Omega \mathrm{~m}$. Earth resistance is limited to $1 \Omega$. Design an earthing system. Fault duration can be taken as 3 seconds. Plate electrode of $1.2 \...
- (b) Explain the important electrical aspects and design considerations specified in the NEC code for the following
- (i) Fire fighting (ii) Lifts and Escalators.