Mechanical Engineering - Engineering Mechanics - Discussion

A - option is related to the velocity ratio.
C- option is related to mechanical efficiency.

So, option B is correct.

Both B and C option are correct.

All are correct option.

mech ad.= load/effort.
mech adv= dis by effort/ displacement by load.
mech ad= output / input.
The output is a load which is regulated by input (effort).
Mechanical advantage always greater than one.

@Nilesh.

The Velocity Ratio = (Effort distance/Load distance).

The ratio of weight (load) lifted by a machine to the force (effort) applied on a machine is called mechanical advantage of the machine.

Both (b) and (c) are correct.

Mechanical advantage is the ratio of output force to input force, so option (c) is correct. Also, the mechanical advantage is load lifted to effort applied, (b) is also correct.

If option 2 is the definition of Mechanical advantage then what will be the definition of velocity ratio?

Mechanical advantage is available by a machine when the effort required is less than load. Considering a lever and fulcrum arrangement, such that load of 10kg is at 1m from fulcrum and effort is applied at 2m distance from the fulcrum, then only 5 kg effort is required to lift the 10kg load. However, to lift load up to a unit distance 5 kg effort is required double the unit distance. So distance moved by effort is larger than the distance travelled by the load. So I guess option A is correct.

Mechanical advantage is basically the term which gives the meaning that, lifting of given load with less effort (for that we are using different mechanical system like lever system).

Therefore the ratio of load lifted to the effort is mechanical advantage. It is always greater than one.

How it is possible?