Assignment – AC Machines (Unit 1)

Course: Electrical Engineering Semester: 4 Subject: AC Machines Assignment No.: 01 Maximum Marks: 20 Submission Date: 27/02/2026

Instructions

• Answer all questions neatly with proper diagrams wherever required.

• Use standard notation and units.

• Each question carries equal marks unless specified.

• Show all steps in derivations and numerical problems.

Part A – Short Answer Questions (2 Marks Each)

1. Explain with neat and clean diagram the Construction and working principle of a three-phase induction motor.

2. Define Slip and slip speed. Explain their significance.

3. Explain Types of three phase induction motors.

4. Draw Equivalent circuit of three phase induction motor and explain its components.

5. Explain Rotor resistance starter – Why is it suitable for slip ring motors?

Part B – Long Answer Questions (5 Marks Each)

1. Compare squirrel cage and slip ring induction motors in terms of construction, performance, starting methods, and applications.

2. Explain why starters are necessary for induction motors. Describe the working of DOL, Star-Delta, Autotransformer, and Rotor Resistance starters with neat diagrams.

Submission Guidelines

• Attach the assignment sheets with a cover page (Name, Roll No., Semester, Subject).

• Use proper diagrams, equations, and references.

• Late submission will result in deduction of marks.