Deck 14: Motor Starters

Question 1

____________________ overload relays are used when the control is located in a varying ambient temperature and the motor that it protects is in a constant ambient temperature.

Answer 1

Ambient compensated

Question 2

Solid-state reduced-voltage controllers provide smooth, stepless acceleration of a motor through the use of silicon-controlled _____________________.

Answer 2

rectifiers

Question 3

The ____________________ starter is often referred to as the "simple" type. This starter has one set of contacts that close when the starter coil is energized. When the contacts close, the motor is connected directly to the line voltage.

Answer 3

across-the-line (full-voltage)

Question 4

Manual motor starters are used extensively on industrial machines.

Question 5

In thermal protected overload relays, the thermal element is connected mechanically to a normally open contact.

Question 6

In the ____ starter, there are two starters of equal size for a given horsepower motor application.

A) manual motor
B) magnetic motor
C) reversing
D) across-the-line (full-voltage)

Question 7

One advantage of the ____ starter is the smooth acceleration.

A) autotransformer
B) primary resistor-type
C) wye- (or star) delta
D) part winding

Question 8

The basic principle of the ____ starter is to apply a percentage of the total voltage to start.

A) locked rotor
B) reduced-voltage
C) jogging
D) stepping

Question 9

The motor starter is similar to the contactor in design and operation. The important difference is the ____.

A) convenience of remote control on one motor or multiple motors
B) use of overload relays on the motor starter
C) rated horsepower and rated voltage
D) closing of contacts that connect the motor to the source of electrical power

Question 10

In the reversing starter, both mechanical and electrical interlocks are used to prevent both starters from closing their line contacts at the same time.