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Seat No
...
___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–I &II (NEW) EXAMINATION – SUMMER-2019
Subject Code: 3110005
Subject Name: Basic Electrical Engineering
Time: 10:30 AM TO 01:00 PM
Date: 20/06/2019
Total Marks: 70
Instructions:
1
...
2
...
3
...
Marks
Q
...
Compare the resistive series and parallel circuit
...
Reduce the portion of the circuit to the
left of terminals a–b to (a) a Thévenin equivalent and (b) a Norton equivalent
...
03
04
07
Q
...
03
(b)
Prove that the sum of readings of two watt meters connected to measure power
in three phase circuit gives total power consumed by the circuit
...
Find (i) What is the
Impedance of the circuit
...
Find I0 (iii) What is the Phase Φ ?
07
(c)
OR
A balanced star connected load of (4+j3) Ω per phase is connected to a balance
3 phase 400 V supply
...
For A
...
sinusoidal current prove that Irms = 0
...
Explain voltage step-up and step-down operation in autotransformer with
diagram
...
(a)
(b)
OR
Explain in brief single phase RC parallel circuit with phasor diagram
Derive the E
...
F
...
(c)
Q
...
3
(a)
(b)
07
03
04
07
03
04
1
Q
...
07
(a)
(b)
(c)
State significance of the back emf in DC motor
...
Explain construction of synchronous generator with diagram
...
4
(a)
(b)
(c)
Q
...
5
(a)
(b)
(c)
Give the classification of Induction motor
...
Explain the working of single phase induction motor with diagram
...
Give the comparison of fuse and MCB
...
OR
What is power factor and why improvement is required in that?
State and explain in brief important electrical characteristics of battery
...
5 HP for 15 minutes are used per day
...
50