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Which of the following is an inversion of a double slider-crank mechanism?


1. Ackerman steering
2. Beam engine
3. Locomotive coupling
4. Scotch yoke mechanism

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Correct Answer - Option 4 : Scotch yoke mechanism

Explanation:

Mechanism and Inversion:

  • When one of the links of a kinematic chain is fixed, the chain is known as a mechanism.
  • A mechanism with four links is known as a simple mechanism, and the mechanism with more than four links is known as a compound mechanism.
  • We can obtain as many mechanisms as the number of links in the kinematic chain by fixing, in turn, different links in a kinematic chain.
  • This method of obtaining different mechanisms by fixing different links in a kinematic chain is known as the inversion of a mechanism.

INVERSION

Four Bar Chain Mechanism

  • Beam Engine (crank and lever mechanism)
  • Coupling rod of a locomotive (double crank mechanism)
  • Watt’s Indicator (Double lever mechanism)

Single Slider Crank Mechanism

  • First Inversion
    • Reciprocating engine or compressor.
  • Second Inversion
    • Whitworth quick return mechanism, Rotary engine etc.
  • Third Inversion
    • Slotted crank mechanism, Oscillatory engine.
  • Fourth Inversion
    • Hand pump, Pendulum pump or Bull engine.

Double Slider Crank Mechanism

  • Elliptical trammels
  • Scotch yoke mechanism
  • Oldham’s coupling

 

Ackermann Steering is an inversion of class-II Four bar chain mechanisms.

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