In a lifting machine with efficiency 60%, an effort of 200 N is required to raise a load of 6 kN. The velocity ratio of the machine is A. 30 B. 50 C. 60 D. 80

The correct answer is A. 30.

The velocity ratio of a machine is the ratio of the distance moved by the effort to the distance moved by the load. In this case, the effort moves 1 meter for every 30 meters moved by the load. This means that the velocity ratio is 30.

The efficiency of a machine is the ratio of the work done by the machine to the work done on the machine. In this case, the machine does 6000 J of work on the load, and the effort does 200 J of work. This means that the efficiency is 60%.

The effort is the force that is applied to the machine to move the load. In this case, the effort is 200 N.

The load is the weight that is

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