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Seat No
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE –SEMESTER 1&2(NEW SYLLABUS)EXAMINATION- WINTER 2018
Subject Code: 3110005
Subject Name: Basic Electrical Engineering
Time: 10:30 am to 01:00 pm
Date: 18-01-2019
Total Marks: 70
Instructions:
1
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2
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3
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Marks
Q
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2
Q
...
(b) Briefly describe the operating principle of a transformer
...
07
(a) Prepare a list of parts of a DC machine
...
(b) Briefly describe the auto transformer and its applications
...
Both the quantities are sinusoidal with 50 Hz frequency
...
Obtain the equations of
voltage and current in this circuit at time ‘t’ second
...
OR
(c) In a series R-L circuit, a voltage of 10 V at 50 Hz frequency produces a current
of 750 mA
...
Find out the values of R and
L in the circuit
...
(b) Mention the types of single phase induction motor
...
(c) Derive the equations of active, reactive and apparent powers in a series R-L
circuit with sinusoidal AC supply
...
3
Q
...
(b) Give a comparison between squirrel cage induction motor and wound rotor
induction motor
...
Assume that switch is
initially open and it is closed at time t=0 second
...
(b) Why the consumers should improve their power factor?
(c) Explain Thevenin’s theorem
...
03
04
07
03
04
07
OR
Q
...
5
Q
...
Daily usage of the air conditioner is 10 hours
...
(c) Explain the term power factor
...
(a) Describe the stator construction of a single phase induction motor
...
OR
(a) Describe the construction of rotor for a slip ring type three phase induction
motor
...
(c) Explain the working principles of a synchronous generator and a synchronous
motor