A four bar mechanism is made up of links of length 100,

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A four bar mechanism is made up of links of length 100, 200, 300 and 350 mm. If the 350 mm link is fixed, the number of links that can rotate fully is _________.

1. No Crank
2. Correct Crank
3. None of these
4. All

Correct Option: A

Here the link, that is fixed is adjacent to the smaller one.
so in this condition we will get on fully rotation (crank)
⇒ if shortest link is fixed
⇒ Double crank (full rotation)
⇒ if opposite to shortest link is fixed
⇒ No Crank.