Deck 18: Stepping Motors, the Motor and Starting Methods

Question 1

Three-phase squirrel cage motors are the most popular motors used in industry.

Answer 1

True

Question 2

The potential starting relay is used with a different type of split-phase motor called the capacitor start-capacitor run motor.

Answer 2

True

Question 3

____ starting is the simplest of all starting methods.

A) Across-the-line
B) Autotransformer
C) Wye-delta
D) Part-winding

Answer 3

Across-the-line

Question 4

Starting methods for single-phase motors involve disconnecting the start winding of a split-phase motor when the motor reaches about ____ percent of its rated speed.

A) 45
B) 55
C) 65
D) 75

Question 5

Inrush current is referred to as ____________________ current.

Question 6

Split-phase motors intended to operate in the open accomplish this by the use of a(n) ____________________ switch connected to the shaft of the rotor.

Question 7

What is a current relay?

Question 8

What is a thermistor?

Question 9

Stepping motors are similar to other types of DC or AC motors in that their output shaft moves through a specific angular rotation each time the motor receives a pulse.

Question 10

Stepping motors can be operated on AC voltage.

Question 11

Generally, less than ____ percent error per angle of rotation exists.

A) 1
B) 5
C) 10
D) 25

Question 12

To allow for better stepping resolution, most stepping motors have ____ stator poles.

A) two
B) four
C) six
D) eight

Question 13

Give an overview of four-step switching.

Question 14

What is the advantage of eight-step switching over four-step switching?