Question

The upward force is balanced by ________

(a) Radial effort exerted by the spur gear on the pinion

(b) Tangential reaction of the annular gear on the pinion

(c) Radial reaction of the annular gear on the pinion

(d) Dead weight

This question was addressed to me in an international level competition.

The doubt is from Epicyclic-train Dynamometers in division Brakes and Dynamometers of Machine Dynamics

Answer 1

Right answer is (d) Dead weight

For explanation: The reaction force by the gears acts in the upward direction tends to rotate the lever about its fulcrum. These upward forces are balanced by the dead weight at the end of the lever.