Correct Answer - Option 1 : Cranes
Concept:
Continuous and constant loads: The loads on the motor operate for a long time under the same conditions
Continuous and variable loads: The load on the motor operates repetitively for a longer duration but varies continuously over a period
Pulsating loads: The load on the motor which can be viewed as constant torque superimposed by pulsations
Impact loads: The load on the motor having regular and repetitive load peaks or pulses, i.e. load increases to a maximum level suddenly
Short time loads: The load of the motor occurs periodically remains constant for short time and then remains idle for longer time
Short time intermittent loads: The load on the motor occurs periodically in identical duty cycle, each duty cycle having period of application of load and rest
Application:
Cranes have the characteristics of short time intermittent loads.
