9.a. A centrifugal starting switch in a split-phase motor operates on the principle that A. a high starting current opens the switch contacts. B. a higher speed changes the shape of a disk to open the switch contacts. C. the actuating weights move outward as the motor slows down. D. the voltage induced in the auxiliary winding keeps the switch contacts open. 9.b. The motor characteristic obtained by using a high-resistance rotor in a shaded-pole motor is a A. lower slip. B. greater starting torque. C. more stable operating speed. D. higher full-load speed.

9.a. A centrifugal starting switch in a split-phase motor operates on the principle that A. a high starting current opens the switch contacts. B. a higher speed changes the shape of a disk to open the switch contacts. C. the actuating weights move outward as the motor slows down. D. the voltage induced in the auxiliary winding keeps the switch contacts open. 9.b. The motor characteristic obtained by using a high-resistance rotor in a shaded-pole motor is a A. lower slip. B. greater starting torque. C. more stable operating speed. D. higher full-load speed.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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Concept explainers

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.

Question

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9.a. A centrifugal starting switch in a split-phase motor operates on the principle that
A. a high starting current opens the switch contacts.
B. a higher speed changes the shape of a disk to open the switch contacts.
C. the actuating weights move outward as the motor slows down.
D. the voltage induced in the auxiliary winding keeps the switch contacts open.
9.b. The motor characteristic obtained by using a high-resistance rotor in a shaded-pole motor is a
A. lower slip.
B. greater starting torque.
C. more stable operating speed.
D. higher full-load speed.

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Name three factors that determine the torque produced by an induction motor.