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Revision Notes

Pulleys — Revision Notes

CBSE · Class 12 · Engineering Graphics

Pulleys revision notes for CBSE Class 12 Engineering Graphics: 4 topics in quick points. Part of the CBSE Class 12 Engineering Graphics syllabus.

2 formulas & key relations5 concepts

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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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Full Notes

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?
Key topics in Pulleys include Introduction to Pulleys and Power Transmission, Flat Belt Pulleys - Construction and Features, V-Belt Pulleys - Design and Applications, Orthographic Projection and Technical Drawing. Study these first, then practise questions on each for the CBSE Class 12 board exam.

Sources & Official References

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

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All CBSE Class 12 Engineering Graphics Revision Notes

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