50) When the axes of the first and last wheels are co-axial, then the train is known as ______

Answer is:

Reverted gear train

Theory of Machines MCQ with Answers

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51) When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.

Answer is:

Wrong

52) The gear train usually employed in clocks is a

Answer is:

Reverted gear train

Explanation:

In a reverted gear train, the first and the last gears have the same axis of rotation. If these two gears are mounted on the same shaft, one of them must be loosely mounted. They find applications in epicyclic gear trains. They are also used in clocks and machine tools.