100V, 1kW DC shunt motor with an armature resistance of 1.2582 rotates at 600 pm. A variable field resistance draws a current of 1A at no load. Given that the field resistance is reduced by 50% at full load, Neglecting the mechanical and iron losses, calculate the following at full load Armature current Torque and speed Electrical efficiency

Q: following: a)Types

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DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.