Which of the following are examples of forced closed kinematic pairs? 1. Cam and roller mechanism 2. Door closing mechanism 3. Slider crank mechanism 4. Automotive clutch operating mechanism Select the correct answer using the codes given below:

Which of the following are examples of forced closed kinematic pairs? 1. Cam and roller mechanism 2. Door closing mechanism 3. Slider crank mechanism 4. Automotive clutch operating mechanism Select the correct answer using the codes given below: Correct Answer 2,3 and 4

Except statement 1 all are examples of forced closed kinematic pairs.
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