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CampusPrep

EX-802 (B) RGPV B.Tech

Special Machine (SM)

Previous year papers and the official syllabus are free to read, no account needed.

Previous Year Papers

4 papers, latest Jun 2025

Free
See all 4 papers

Syllabus, notes and important questions for EX-802 (B)

Syllabus units

Topics as the official RGPV syllabus lists them.

Unit 1 Stepper Motors 7 topics
  • Discretisation of angular position by stepper structures
  • Stepping angle and frequency of excitation
  • VR and PM rotor structures and their torque production
  • Torque‑angle characteristics
  • Hybrid structure and torque production by permanent magnet and excitation fluxes
  • Power electronic converters for stepper motors
  • Control by load angle
Unit 1 notes
Unit 2 Switched Reluctance Motor 6 topics
  • Static torque production
  • Partition of energy and effects of saturation
  • Dynamic torque production
  • Torque‑speed characteristics
  • Shaft position sensing
  • Solid rotors
Unit 2 notes
Unit 3 Brushless DC Motor 8 topics
  • Construction and principle
  • Speed control
  • Basic concept of torque
  • Outer and inner rotor configurations
  • Magnetic circuit concept
  • Electrical analogy
  • Winding pattern: series and parallel
  • Thermal considerations
Unit 3 notes
Unit 4 Permanent Magnet Materials and Circuits 4 topics
  • Characteristics, parameters, properties, classification and calculations of permanent magnet materials
  • Permanent magnet motor types
  • DC brushed motor design and analysis
  • Control strategies and applications
Unit 4 notes
Unit 5 PM Synchronous Motors and PM Step Motors 7 topics
  • PM synchronous motor rotor construction
  • Theory, operation and control of PM synchronous motors
  • Applications of PM synchronous motors
  • PM step motors and hybrid step motors
  • Sensorless control techniques
  • Reduction of torque pulsations
  • Case studies: electric vehicles, industrial drives, PV‑fed water pumping
Unit 5 notes
Read the full syllabus

Exam insights

Counted from 4 past EX-802 (B) papers.

Marks asked per paper, by unit

  • Unit 1 Stepper Motors 30 marks
  • Unit 2 Switched reluctance motor 18 marks
  • Unit 3 BrushLess DC Motor 24 marks
  • Unit 4 Permanent magnet materials and circuits 9 marks
  • Unit 5 PM synchronous motors 28 marks

Average marks of the questions from each unit in one paper. You answer only some of them, so the total is more than the paper’s maximum.

Asked again and again

  1. Explain the speed control methods and power controllers used for PMSM with necessary diagrams.

    Asked 3 times: 2023, 2022

  2. Explain the principle of operation of a switched reluctance motor with cross-sectional diagram and state its advantages.

    Asked 2 times: 2025, 2024

  3. Explain the different types of stepper motors, including single-stack and multi-stack, with a neat schematic diagram and working operation.

    Asked 2 times: 2025, 2023

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