Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem Old 130904 Electrical Machines I Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:130904 Date:05/12/2018
Subject Name:Electrical Machines-I
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain construction of dc machine 07
(b) Explain torque-slip characteristics of three phase induction motor 07
Q.2 (a) Explain the voltage build up process of dc shunt generator 07
(b) Derive armature torque and shaft torque equation of dc motor 07
OR
(b) State different methods of speed control of dc motor. Explain Ward leonard
method
07
Q.3 (a) Explain three point starter 07
(b) Explain working principle of three phase induction motor 07
OR
Q.3 (a) Explain various methods of measurement of slip of three phase induction motor 07
(b) 3-phase ,50-Hz ,8-pole , induction motor has full-load slip of 2%. The rotor
resistance and stand still rotor-reactance per phase are 0.001 ohm and 0.005
ohm respectively. Find the ratio of the maximum to full - load torque and the
speed at which the maximum torque occurs.
07
Q.4 (a) Explain working principle of transformer at no load and loaded condition 07
(b) Explain autotransformer 07
OR
Q.4 (a) Discuss the conditions for parallel operation of transformer 07
(b) Explain open circuit and short circuit test of transformer 07
Q.5 (a) Explain distribution factor and pitch factor 07
(b) Explain synchronous impedance method to determine the voltage regulation of
alternator
07
OR
Q.5 (a) Discuss conditions of parallel operation of synchronous generator 07
(b) Explain MMF method to determine the voltage regulation of alternator 07
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This post was last modified on 20 February 2020