GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (OLD) EXAMINATION - WINTER 2018
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Subject Code:150904 Date: 11/12/2018
Subject Name: Elements Of Electrical Design
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full mark.
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Q.1 (a) Explain the advantages & disadvantages of Lap & Wave winding.
(b) Explain the Direct-On-Line starter of induction motor with necessary wiring diagram.
Q.2 (a) Derive the necessary equation to calculate the resistance steps for D.C. Shunt Motor.
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(b) Explain the different types of Iron losses.
OR
(b) Determine the MMF required for the air gap of a machine having the following data.
Core length=300 mm including 3 ducts of 10 mm width, pole arc=22 cm, slot pitch=6.0 cm, slot opening= 6 mm, flux per pole= 0.043 wb, length of air gap=0.5 cm, assume Carter’s co-efficient of 0.18 and 0.28 for opening/gap 1 & 2 respectively.
Q.3 (a) What is the basic function of electromagnet? List out the different types of Electromagnet.
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(b) The starter of a 400 v dc series motor has 4 resistance section and the current limits during the starting are 100 A and 150 A. The resistance of the machine is 0.2O and between these current limits the flux changes by 9%. Determine the resistance of each section of starter.
OR
Q.3 (a) Explain the importance of dummy coil and equalizer connections in case of d.c. winding.
(b) Define Real & Apparent Flux Density.
Q.4 (a) What are the important factors while selecting the suitable size of conductor for industrial wiring?
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(b) List out the different types of material used in Residential wiring.
OR
Q.4 (a) Explain the important basic equation in case of Electromagnet.
(b) Explain the design procedure of 1-phase Small Transformer.
Q.5 (a) Define following with refer to D.C. Armature Winding
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(1) Front Pitch (2) Back-Pitch (3) Commutator Pitch (4) Pole-Pitch
(b) Explain the design steps of welding transformer.
OR
Q.5 (a) Differentiate between integral and fractional slot winding & state advantages of fractional slot winding.
(b) Draw the Electrical wiring diagram of 7-hp induction motor considering the star-delta starter.
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