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B.E. Mid-Semester Remedial Examination: LDRP Institute of Technology & Research, Gandhinagar

This document appears to be an exam for an Electrical Machines Design course, consisting of 3 questions worth a total of 30 marks. Question 1 has two parts asking about developing output equations for DC and AC machines, and about main machine dimensions and definitions of total and specific loading. Question 2's parts are about factors affecting electrical loading and temperature rise, and the role of peripheral speed on machine dimensions. Question 3's parts are about optimizing transformer design for minimum cost and deriving the output equation for transformer voltage per turn, or alternatively about window space factor and types of transformer windings.

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ayan Patel
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2K views1 page

B.E. Mid-Semester Remedial Examination: LDRP Institute of Technology & Research, Gandhinagar

This document appears to be an exam for an Electrical Machines Design course, consisting of 3 questions worth a total of 30 marks. Question 1 has two parts asking about developing output equations for DC and AC machines, and about main machine dimensions and definitions of total and specific loading. Question 2's parts are about factors affecting electrical loading and temperature rise, and the role of peripheral speed on machine dimensions. Question 3's parts are about optimizing transformer design for minimum cost and deriving the output equation for transformer voltage per turn, or alternatively about window space factor and types of transformer windings.

Uploaded by

ayan Patel
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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Enrollment No.

KADI SARVA VISHWAVIDYALAYA


LDRP INSTITUTE OF TECHNOLOGY & RESEARCH, GANDHINAGAR
B.E. MID-SEMESTER REMEDIAL EXAMINATION SEPTEMBER 2019
Date : 27/09/2019 Branch : Electrical Engineering
Subject Name & Code: Electrical Machines Design (EE-702) Semester : 7 th Semester (Shift-I & II)
Time : 01:30 Pm To 03:00 9m Max. Marks : 30
Instructions: 1) All questions are compulsory.
2) Figures to the right indicate full marks.
3) Indicate clearly, the options you attempt along with its respective question number.
4) Use the last page of main supplementary for rough work.

Marks

Q.1 (A) Developed the output equation of (i) a d.c. machines (ii) an a.c. machnes. [5]
(B) What are the “main dimension” in machine design? What do you mean by total loading [5]
and specific loading?

Q.2 (A) List out the factor effecting of choice of electrical loading and explain permissible [5]
temperature rise factor
(B) Explain the role of peripheral speed on choice of D and L for generalized machine [5]
OR
Q.2 (A) Which factor should be considered when estimating the length of air gap of induction [5]
motor? And explain each factor in details.
(B) State some method to reduce the harmonics torque in induction motors. [5]

Q.3 (A) Optimize the transformer design from the point of view (i) minimum cost [5]
(B) Derive the output equation –volt per turn of transformer. [5]
OR
Q.3 (A) What is window space factor? Derive the equation of width of window for optimum [5]
output
(B) State the various types of windings used in core type of transformers. Explain any one of [5]
them.

*****All the Best*****

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