Assertion (A): The given line diagram of watt’s indicator mechanism is a type of crank and lever mechanism.

Reason (R): BCD acts as a level
Option (A)
Both A and R are individually true and R is the correct explanation of A
Option (B)
Both A and R are true but R is not the correct explanation A
A is true but R is false
A is false but R is true
Correct Option:
Question Solution:
A watt’s indicator diagram, also known as watt’s straight line mechanism or double lever mechanism, consists four link (as shown in figure). Link BCD and EF acts as lever. The displacement of link BFD is directly proportional to the pressure of gas or steam which acts on the plunger.