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Basic Mechanical Engineering by Pravin Kumar

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13

Lifting Machines

Chapter Objectives

In this chapter, you will learn about:

  • Principle of working of lifting machines
  • Reversible and irreversible lifting machines
  • Various types of lifting machines
  • Mechanical advantage and efficiency of lifting machines
13.1  INTRODUCTION

A machine is a device, which is capable to do some work on application of some effort. Here, effort means input in the form of force or energy supplied to the machine to do work. The work may be explained in the form of load lifting. An illustrative example of a lifting machine is explained with Figure 13.1. Figure shows lifting of a bucket of water by applying the effort ‘P’ on one end of the rope wrapped on pulley and other end connected to the bucket of weight ‘W’. ...

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