Gujarat Technological UniversitySummer 2026 examination

GTU 3160918 Element of Electrical Design Summer 2026 Question Paper & PDF

B.E. · Electrical Engineering · Semester 6 · Subject code 3160918
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks

Define the real and apparent flux densities in the tooth of d.c machine armature.

(b)
4 marks

List various methods for calculating the mmf required for tapered teeth & Explain any one.

(c)
7 marks
Determine the air gap length of DC Machine from the following data:

Gross core length=0.1 meter, Number of ducts=1, Width of duct=10 mm,Slot pitch= 24 mm, Slot Width= 12mm, Carter’s coefficient for slots and ducts=0.3, Gap flux density at pole center=0.65 T, Field MMF per pole=3800 A, MMF required for iron parts of magnetic circuit= 600 A.

Q.2

14 Marks
(a)
3 marks
Define the following terms used in armature winding design:
1)back pitch
2)Commutator pitch
3)Front pitch
(b)
4 marks
Give the comparison between Lap winding and Wave winding.
(c)
7 marks

Find the front pitch, back pitch, winding pitch and commutator pitch for a simplex wave wound 13 slots, 4-pole d.c. armature with 13 commutator segments. Draw the winding diagram in developed form. Also draw the sequence diagram to indicate the position of brushes. Assume number of coil sides per slot=2.

(c)
7 marks

Design a mush winding for 3-phase, 4-pole and 36 slots stator. Also show winding diagram for R phase.

Q.3

14 Marks
(a)
3 marks
What is soft starter? What are the advantages of soft starter?
(b)
4 marks

Explain working of No Volt Coil and Overload Release coil in terms of three point starters for DC motor.

(c)
7 marks
Explain design procedure of a small single phase transformer.
(a)
3 marks

Discuss function & necessity of field regulator in case of DC shunt Generators.

(b)
4 marks
Explain the working of 4- point starter with neat sketch for DC motor.
(c)
7 marks

Calculate the steps in a 4 section rotor resistance starter for a 3 phase slip-ring induction motor from the following data: Full load slip = 2.5%, maximum starting current = Full load current, Rotor resistance per phase = 0.02 ohm.

Q.4

14 Marks
(a)
3 marks

Write steps to estimate the cost of electrical wiring installation for building.

(b)
4 marks

Define wiring diagram and schematic diagram.Draw a wring diagram and schematic for light and fan circuit.

(c)
7 marks

A small room of size 4 m X 3 m is required to be provided with lamp, fan, tube light and one 5A 3-pin socket outlet. Each of the points is controlled with their respective switches installed in one switch board. Assume PVC wiring system. No main switch is to be provided as the entry of the sub-circuit is from nearby room. Do the following:

i)Mark the location of electrical points and draw the installation plan.
ii)Draw the wiring and schematic diagram.
iii)Calculate the length of phase and neutral wire required for the winding installation.
iv)Calculate the length of earth wire required.
(a)
3 marks

How can you determine the number of sub circuits, rating of main switch and distribution board?

(b)
4 marks
State the rules for electrical wiring as per IS.
(c)
7 marks

Explain the installation plan, wiring diagram and single line diagram for electric wiring based on a given load. Also give the rules for deciding the number of sub circuits and power circuit.

Q.5

14 Marks
(a)
3 marks

Explain the importance of (a) current carrying capacity and (b) voltage drop while determining the size of conductor.

(b)
4 marks

What is control panel? State and explain the various components/devices used in the control panel.

(c)
7 marks

The domestic load in a residential building is used in the following manner:

i)LED tubes 18W each, 04 Nos., switched on for 6 hours/day
ii)LED lamps 07W each,04Nos., switched on for 2 hours/day
iii)Ceiling fans 60W each, 04Nos., switched on for 08 hours/day
iv)Air conditioner (1.5T) 1500W, switched on for 04 hours/day
v)Refrigerator of 300W, switched on for 12 hours/day
vi)Television100 W, switched on for 12 hours/day Calculate (a) connected load (b) Total cost of electrical energy for 30 days at the rate of Rs. 5/Unit.
(a)
3 marks
Which materials are required for installation of service connection?
(b)
4 marks

Why AC system is preferred over DC system for transmission and distribution of electrical energy?

(c)
7 marks

What is electric power supply system? With help of a single line diagram explain typical ac power supply system.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Element of Electrical Design (Summer 2026, B.E. · Electrical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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