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Exam 5: DC Motors, Control Circuits, AC Motors and Variable Speed Drives

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Question 51

Multiple Choice

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The magnetic field strength of an electromagnet cannot be increased by

A) the amount of current.
B) the type of core.
C) the type of material.
D) the number of coils in the wire.

E) A) and C)
F) A) and D)

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Question 52

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The poles of a magnetic are determined by the electronic makeup of the material.

A) True
B) False

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Question 53

True/False

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The shaded pole induction motor is a single phase motor, which has no start and run windings.

In a series motor, stall torque occurs at the locked rotor condition.

The centrifugal start switch is usually mounted on the shaft of the AC motor.

The commutator segments continually change polarity from positive to negative, which causes the magnetic field in the armature to change polarity form north pole to south pole.

The narrower the air gap the stronger the magnetic field.

The short shunt cumulative compound motor is used most often because the shunt field has a relatively constant current.

The wound rotor construction is not a common AC motor in industry.