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Revision Notes

Pulleys

CBSE · Class 12 · Engineering Graphics

Quick revision notes for Pulleys — CBSE Class 12 Engineering Graphics. Key concepts, formulas, and definitions for last-minute revision.

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A diagram illustrating a basic pulley and belt drive system, showing a driver pulley, a driven pulley, and a connecting belt. Labels indicate the driver, driven, and direction of rotation. Also shows
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Key Topics to Revise

1

Introduction to Pulleys and Power Transmission

  • Pulleys transfer power from motor to operational parts using belts as flexible connectors
  • Driver pulley: attached to motor shaft; Driven pulley: attached to machine shaft
  • Speed ratio depends on diameter ratio of driver and driven pulleys
2

Flat Belt Pulleys - Construction and Features

  • Rim has slight convex curvature called 'crowning' to prevent belt slipping
  • Crowning keeps belt centered on the rim during rotation
  • Made of Cast Iron (C.I.) with solid web construction for diameters up to 200mm
3

V-Belt Pulleys - Design and Applications

  • Features wedge-shaped V-groove on rim for V-shaped belt cross-section
  • Higher efficiency in power transmission compared to flat belts
  • Standard groove angle is 40° (may vary with pulley diameter)
4

Orthographic Projection and Technical Drawing

  • Standard views: Front view (with upper half in section) and Side view
  • Sectional views show internal construction details
  • Include shaft and key assembly in drawings

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Key Concepts

Power is transferred from motor shaftRIMUsed for diameters up to 200mmFeatures wedgeTechnical drawing showing Front View (often

Frequently Asked Questions

What are the important topics in Pulleys for CBSE Class 12 Engineering Graphics?
Pulleys covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Pulleys — CBSE Class 12 Engineering Graphics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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