Types of Load (Cont.)

• One and the same machine can be represented by a load torque which either varies with the speed or with the time.
  
  
• For example, a fan load whose load torque is proportional to the square of the speed, is also a continuous, constant load.
  
  
• Load torque of a crane is independent of the speed and also short time intermittent nature.
  
  
• Rocking pumps for petroleum have a load which vary with angular position of the shaft, but also be classified as a pulsating load.