Which type of gear train is used in clock mechanism to join hour hand and minute hand?

Solution(By Examveda Team)

Simple Gear Train (Option A):
In a wall clock, the connection between the hour hand and the minute hand is often achieved using a simple gear train. In this setup, the minute hand is attached directly to a small gear, while the hour hand is attached to a larger gear. These two gears are meshed together, and as the minute hand rotates, it causes the hour hand to move at a slower rate, maintaining the correct timekeeping ratio.

Compound Gear Train (Option B):
In a machine where you need to combine the motion of multiple gears, such as in a lathe or milling machine, a compound gear train might be used. This allows for more complex speed and torque relationships.

Reverted Gear Train (Option C):
Reverted gear trains are sometimes used in applications where you need to reverse the direction of rotation between two shafts. An example could be in a conveyor system where the input and output directions need to be opposite.

Epicyclic Gear Train (Option D):
Epicyclic gear trains, also known as planetary gear systems, are commonly found in automatic transmissions of vehicles. They allow for various speed ratios and direction changes within a compact design.

In clock mechanisms, the gear train used to join the hour hand and the minute hand is typically a simple gear train. A simple gear train consists of two gears of different sizes meshed together, and it is used to transfer motion from one shaft to another while maintaining a constant speed ratio.

Therefore, the correct answer is Option A: Simple gear train. Compound gear trains, reverted gear trains, and epicyclic gear trains may be used in different mechanical systems for specific purposes, but for the basic connection of the hour and minute hands in a clock, a simple gear train is commonly used.