A certain weight lifting machine of velocity ratio 30 can lift a load of 1500 N with the help of 125 N effort. The efficiency of the machine is _______.

Question

Question

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JKSSB JE Mechanical 02 Nov 2021 Shift 1 Official Paper

Answer 1

Concept:

Mechanical Advantage:

In a simple machine when the effort(P) balances a load (W), the ration of the load to the effort is called MA.

Velocity Ratio:

It is the ratio between the distance moved by the effort to the distance moved by the load.

Efficiency:

It is the ratio of output to input. In a simple mechanism, it is also defined as the ratio of mechanical advantage to the velocity ratio.

Calculation:

Given:

Load, W = 1500 N, Effort, P = 125 N, V.R = 30