Which motor has the poorest speed control?

Related Mcqs:

For starting a D.C. motor a starter is required because___________?

A. it limits the speed of the motor B. it limits the starting current to a safe value C. it starts the motor D. none of the above...

Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?

A. Lenz’s law B. Faraday’s law C. Coloumb’s law D. Fleming’s left-hand rule...

In D.C. machines the residual magnetism is of the order of_________________?

A. 2 to 3 per cent B. 10 to 15 per cent C. 20 to 25 per cent D. 50 to 75 per cent...

In Ward-Leonard control the lower limit of speed is imposed by________?

A. residual magnetism of the generator B. core losses of motor C. mechanical losses of motor and generator together D. all of the above...

The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?

A. reducing the field current B. decreasing the armature current C. increasing the armature current D. increasing the excitation current E. none of the above methods...