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Seat No
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER 1&2 EXAMINATION – SUMMER 2020
Subject Code: 3110005
Subject Name: Basic Electrical Engineering
Time: 10:30 AM TO 01:00 PM
Date:10/11/2020
Total Marks: 70
Instructions:
1
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2
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3
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Marks
(a) A resistance of 10Ω is connected in series with two resistances each
of the 15Ω arranged in parallel
...
5 A with 20 V applied?
(b) State the superposition theorem with suitable example
...
Q
...
(b) Define the following terms for AC (alternating current) signal:
Q
...
3
(a)
(b)
(c)
Q
...
4
(a)
(b)
(c)
(i) Crest Factor (ii) Form Fator (iii) Average Value (iv) RMS
Value
...
If the voltage
across the resistance is 125 V and across the coil 200V, calculate
(i) impedance, reactance and resistance of the coil (ii) the power
absorbed by the coil (iii) and total power
...
Write the comparison between series resonance and parallel
resonance condition in AC circuit
...
Also, prove that the
total three-phase power consumption in star connection is PT = √3
VL IL cos φ
...
OR
Explain magnetic hysteresis
...
M
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equation of a single phase transformer
State the difference in core type and shell type transformer with neat
and clean construction diagram
...
Why single-phase induction motor is not self starting while threephase induction motor is self starting
...
Explain construction of Alternator with neat diagram
...
4
Q
...
m
...
in DC motor acts like a governor
...
Draw the necessary diagram
...
03
04
(a) Calculate the resistance of a 100 m length of wire having a uniform
cross sectional area of 0
...
(b) Discuss types of cables used for residential and commercial wiring
...
5
OR
(a) A d-c generator has an e
...
f of 200 volts and provides a current of 10
03
amps
...
(c) Explain different types earthing and its importance in electrical
utility system in detail