What is the efficiency of a machine, given mechanical advantage is 2 and velocity ratio is 4?

Answer true or false: If the efficiency of a machine is 100%, the mechanical advantage equals the velocity ratio.

What is the ratio between mechanical advantage and velocity ratio of a practical machine.

In the following figure : What is the efficiency of this pulley system if the mechanical advantage is 3?

What is the ratio between mechanical advantage and velocity ratio of an ideal machine.

The efficiency of a simple machine having mechanical advantage 5 is 80% . If the displacement of the effort in lifting a load by using the machine is 20 cm, find the displacement of the load.

In a wheel and axle machine the radii of the wheel and axle are 0.5 m and 0.05 m,respectively . A weight of 100 kg is raised when it is hanging by a rope from the axle by applying a force of 12 kg on the circumference of the wheel . Find the mechanical advantage, velocity ratio and efficiency of this machine.

Obtain the relation between mechanical advantage, velocity ratio and efficiency.

(i) With reference to the terms, mechanical advantage, velocity ratio and efficiency of a machine, name the term that will not change for a machine of a given design. (ii) Define the term stated by you in part (i).