If we compare the effort arm length with the load arm length in a class 3 lever, then which of the below is true?

Question

Question

This question was previously asked in

RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 1)

effort arm length can be greater than, equal to or less than the length of the load arm
effort arm length is always = load arm length
effort arm length is always < load arm length
effort arm length is always > load arm length

Answer 1

Concept:

Lever:

A lever is a simple machine made up of a rigid rod arranged in such a manner that it can move freely around a fixed part.
It consists of the following three parts.

Fulcrum:

Load:

Effort:

Explanation:

On the basis of the position of load, effort, and fulcrum, the lever can be classified into three types.

First-class lever:

The lever in which the fulcrum is located in between the load and the effort is called a first-class or class one lever.
Examples: a pair of scissors, a see-saw, and a crowbar.

Second-class lever:

A Lever in which the load is located between the fulcrum and the effort is called a second-class or class two lever.
Examples: a wheelbarrow, a bottle opener, and a nutcracker.

Third-class lever:

It is a Lever in which the effort is located in between the fulcrum and the load is called a third-class or class three lever.
Examples: a stapler, a pair of tongs, and a finishing rod.

Levers of the third order.

Levers in which the effort is situated between the load and the fulcrum are called levers of the third order.
For example, a pair of tongs, the forearm of a person holding a load, a fishing rod, and a knife used to slice bread.
The mechanical advantage of the levers of the third order is always less than one because their effort arms are shorter than their load arms.
So, these machines can increase speed but cannot lift heavy loads, that is, a lever of the third order always reduces the force applied by the effort.

Hence, option-3 is correct