GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (Old) EXAMINATION - WINTER 2019
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Subject Code: 131901 Date: 10/12/2019
Subject Name: Electrical Machines And Electronics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the working of two wire DC Generator. 07
(b) Classify and Explain DC Generator with circuit diagram with terminal voltage and generated power equation. 07
Q.2 (a) Classify and Explain any one speed control methods for DC Shunt motor. 07
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(b) Sketch and explain the speed-current, speed-torque and torque-current characteristics of a DC Shunt motor. 07
OR
(b) Draw and explain the construction of a DC Machine. 07
Q.3 (a) Explain the core type and shell type single phase transformer and their working principle. 07
(b) Explain the use of Bushing, Oil conservators and Breather in transformer. 07
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OR
Q.3 (a) Explain double field revolving theory for the single phase induction motor. 07
(b) Explain production of rotating magnetic field in the stator of three phase induction motor. 07
Q.4 (a) What is power factor? Discuss the disadvantages of low power factor and explain the methods to improve power factor. 07
(b) What do you mean by Tariff? Explain different types of Tariff. 07
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OR
Q.4 (a) Write advantages of high transmission voltage. 07
(b) Explain parallel operation of alternators. 07
Q.5 (a) What is the purpose of substations in electrical power system? Explain briefly the function of various equipment use in a substation. 07
(b) What is Logic-Gate? Draw the Truth table & symbol for NOT, AND, NAND, OR, NOR Gate. 07
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OR
Q.5 (a) Explain three phase bridge rectifier in detail with the help of circuit diagram and waveforms 07
(b) Draw & Explain Internal architecture of 8085 microprocessor 07
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