A 2 HP motor is attached to a gearbox by a coupling. The motor shaft (and therefore the input shaft of the gearbox) turns at 1,800 revolutions per minute. We observe that the output shaft of the gearbox is turning at 60 revolutions per minute, and is producing 1 HP of unusable power. From this data, we can conclude that the efficiency of the gearbox is:

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain