What is the exam pattern and passing mark for GTU Design of AC Machines (2170909)?

The GTU theory examination carries 70 total marks with a duration of 2.5 Hours. Minimum passing criteria is 23 marks (33%). The paper consists of 5 main questions with official marking breakdown and internal choices.

Where can I download the official GTU 2170909 Summer 2025 question paper PDF?

The official GTU question paper PDF is linked directly from Gujarat Technological University's official examination archive. You can view the full paper online or download the original file.

How can I practice solutions for these GTU questions?

Every question on UnFoldPrep includes deep-linking and one-click AI prompt buttons for ChatGPT, Claude, and Perplexity that instantly formulate structured exam prompts with standard mark breakdowns and academic rubrics.

Gujarat Technological UniversitySummer 2025 examination

GTU 2170909 Design of AC Machines Summer 2025 Question Paper & PDF

B.E. · Electrical Engineering · Semester 7 · Subject code 2170909

Download official PDF View PDF here

Share with your class

Total: 70 marks
To pass: 23 marks (33%)
Duration: 2.5 Hours 2:30 PM – 5:30 PM
Questions: 5 with internal choice

No solutions on this paper yetNeed them for your exam? Ask once. Papers that students ask for are solved first, and we aim to add them within 24 hours.

Q.1

14 Marks

(a)

3 marks

Explain the concept of output equation in the design of a three-phase induction motor.

(b)

4 marks

Discuss the factors influencing the choice of specific loadings in the design of 3-ph. induction motors.

(c)

7 marks

Design the stator for a 10 HP, 400 V, 50 Hz, 4-pole three-phase induction motor. Calculate the number of turns per phase, stator slot area, total number of stator slots, and stator core length. pole three-phase induction motor. Calculate the number of turns per phase, stator slot area, total number of stator slots, and stator core length.

Q.2

14 Marks

(a)

3 marks

Explain the rules for selecting the number of rotor slots in a squirrel cage rotor.

(b)

4 marks

Discuss how rotor slots can be designed to minimize harmonics in induction motors.

(c)

7 marks

Design the rotor for a 15 HP, 400 V, 50 Hz, 4-pole three-phase induction motor. Calculate only the number of rotor slots, cross-sectional area of rotor conductors.

(c)

7 marks

Design the rotor for a 20 HP, 400 V, 50 Hz, 6-pole three-phase induction motor with a wound rotor. Calculate the number of rotor slots, number of turns, and cross-sectional area of rotor conductors.

Q.3

14 Marks

(a)

3 marks

Outline the main dimensions in the design of a single-phase induction motor.

(b)

4 marks

Explain the design of auxiliary winding in a single-phase induction motor.

(c)

7 marks

Calculate the capacitance required for maximum torque in the design of a single- phase induction motor with a rated power of 5 HP, 230 V, and 50 Hz.

(a)

3 marks

State the methods of improving starting torque of three phase induction motor.

(b)

4 marks

Explain the importance of conductor's area in stator design.

(c)

7 marks

What is dispersion coefficient? Explain its effect on maximum power factor.

Q.4

14 Marks

(a)

3 marks

Explain the output equation and design of main dimensions in synchronous machine design.

(b)

4 marks

Describe the armature winding design for synchronous machines.

(c)

7 marks

Determine the full load field MMF and design the field winding for a 500 KVA, 3-phase, 11 KV synchronous machine.

(a)

3 marks

Explain the difference between turbo and hydro alternator in a point of view of design.

(b)

4 marks

Define SCR and its importance in designing of synchronous machine.

(c)

7 marks

Design the main dimensions, stator, and rotor of a turbo alternator for a 20 MW, 11 KV, 50 Hz generator. Calculate the length of the air gap.

Q.5

14 Marks

(a)

3 marks

Introduce the Finite Element Method (FEM) and its applications in the design of electrical machines.

(b)

4 marks

Discuss the advantages of using open-source FEM software for 2D design in electrical machine design.

(c)

7 marks

Compare different 1-phase induction motor in a point of view of design.`

(a)

3 marks

Derive the equation of MMF of damper winding.

(b)

4 marks

Explain main differences between design of 1-ф and 3-ф induction motor

(c)

7 marks

Write the steps and necessary equations for armature design of a synchronous machine.

Other Semester 7 subjects

BE Electrical

2170901

Interconnected Power System

2170908

Switch Gear and Protection

2170913

Industrial Instrumentation

3170906

Advanced Power Electronics

Preparing with friends?

Send this paper to your class group. Every question has its own link.

About this paper

Official Gujarat Technological University (GTU) examination paper for Design of AC Machines (Summer 2025, B.E. · Electrical Engineering, Sem 7). 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.

Download official PDF All Design of AC Machines Papers (1) →Report a typo or correction