Question

Which of the following is an inversion of the double slider crank chain?

1. Rotatory engine
2. Scotch yoke
3. Reciprocating compressor
4. Whitworth quick return mechanism

Answer 1

Correct Answer - Option 2 : Scotch yoke

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