Common carrier. A common carrier in common law countries (corresponding to a public carrier in civil law systems, usually called simply a carrier) is a person or company that transports goods or people for any person or company and that is responsible for any possible loss of the goods during transport.
Best Answer: Torque is a twisting force. It is the power output of an engine at one specific point in time. The first number, 200 in your expample, is the amount of torque. In America is is measured in foot/pounds. The second number, 400 in your example, is the RPM where that torque number occurs.
Torque demand, expressed in foot-pounds, is the result of force (line pull) x radius (distance from the drum axis to the outer layer of wire rope). If the line pull remains the same, and the number of layers on the drum increases, the torque required to lift the load (torque demand) increases. For example, assume the line pull resulting from a load on the hook is 16,000 pounds. The radius to the first layer of wire rope is 25-l/2â³ -:- 2, or 12-3/4â³. Torque required to rotate the drum, equals 17,000 foot pounds (i.e., 16,000 x 12.75 -:- 12).