Motors 1

Question 1

What are the 2 most common types of motors?

Answer 1

AC and DC

Question 2

What are the input and output ratings of AC motors.

Answer 2

120, 208, 240, 480 and 600VAC

Question 3

Factors that cause a motor to over heat.

Answer 3

Voltage imbalances on 3phase motors
High ambient temps
Slow or repeated stop starts
Blocked ventilation holes

Question 4

What on a motor name plate defines the amount of overload a motor can continuously deliver without over heating?

Answer 4

Service factor (SF)

Question 5

If the frame size of a motor is 48 or 56 this indicates the shaft center height is in

Answer 5

16ths of an inch.

Question 6

For 3 digit frame sizes the first to
Two numbers indicate what?
And the 3rd digit refers to?

Answer 6

The shaft center height in fourths of an inch.
The mounting holes on the motor base.

Question 7

The big downfall of AC motors is?

Answer 7

Torque

Question 8

9 wires on a motor tells us?

Answer 8

It can be wired high voltage

Question 9

3 wires on a motor tell us?

Answer 9

Means there’s no way it can be wired high voltage.