MN State 2019-Electric Motors,Controls and Sensing Devices

Question 1

The type of motor that would be found operating a time clock is…

Answer 1

Synchronous

Question 2

Sealed ball bearings on an electric motor should be greased how often?

Answer 2

Cannot be greased

Question 3

The stationary electromagnet in a electric motor is called a

Answer 3

Stator

Question 4

Adjust the too rest of a stationary grinder within how far of the wheel?

Answer 4

1/16”

Question 5

This component responds to the changes in moisture in a grain drying system.

Answer 5

Humidistat

Question 6

What kind of switch is used to shut off an auger when the grain bin is full?

Answer 6

Limit Switch

Question 7

If electric motors are not cooled properly what problems could occur?

Answer 7

shorts developing in the winding, insulation breakdown in the winding and increase amperage draw resulting lower voltage

Question 8

Squirrel Cage is a term used to describe what general term?

Answer 8

The Rotor

Question 9

The type of electric motor enclosure that must be used to move grain in a feed bin is:

Answer 9

Totally Enclosed motor

Question 10

Does dry air affect the factors of a motor life?

Answer 10

NO

Question 11

The windings of a three phase induction motors are located approximately how many degree out of phase from each other?

Answer 11

120