Download GTU BE/B.Tech 2018 Winter 3rd Sem Old 131901 Electrical Machines And Electronics Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem Old 131901 Electrical Machines And Electronics Previous Question Paper

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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:131901 Date:12/12/2018

Subject Name:Electrical Machines And Electronics

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) Draw and explain the construction of a DC Machine. 07
(b) Explain Internal and External characteristics of DC Shunt Generator 07

Q.2 (a) Is DC Motor self-started? Why? Draw and Explain Three point starter. 07
(b) Sketch and explain the speed-current, speed-torque and torque-current
characteristics of a d.c. shunt motor.
07
OR
(b) Classify and Explain DC Generator with circuit diagram with terminal voltage
and generated power equation.
07

Q.3 (a) Explain production of rotating magnetic field in three phase induction motor. 07
(b) Is Single phase induction motor self-starting? Why? Explain double field
revolving theory for the same motor.
07
OR
Q.3 (a) Explain parallel operation of alternators. 07
(b) Explain the construction features and working principle of single phase
transformer
07

Q.4 (a) Explain different speed control methods for DC Shunt motor. 07
(b) What is power factor? Discuss the disadvantages of low power factor and
explain the methods to improve power factor.
07

OR
Q.4 (a) Explain merits and demerits of overhead system and underground system for
electric supply. Also compare A.C. and D.C. transmission system
07
(b) What do you mean by Tariff? Explain different types of Tariff. 07

Q.5 (a) Explain the full wave rectifier in detail with the help of circuit diagram and
waveforms
07
(b) Draw & Explain Internal architecture of 8085 microprocessor 07
OR

Q.5 (a) What is the purpose of substations in electrical power system? Explain briefly
the function of following equipment in a substation:
1) Bus-bar
2) Circuit Breaker
3) Isolator
4) Lightning Arrester
5) Insulator
07
(b) What is Logic-Gate? Draw the Truth table & symbol for AND, OR, NOT, NOR
Gate. Also State & Explain De-Morgan?s Theorem
07

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