Chapter 14. AC Motor workbook questions

If T2 and T5 measures 20 Ω when testing the windings of a 3φ, delta-connected, dual-voltage motor with and ohmmeter, what should the reading be between T5 and T7?

20 Ohms

How is a motor tested to determine the load of a motor?

Ammeter

What is the most likely part of a splt-phase motor to fail overtime with a properly sized and installed motor?

Centrifugal Switch

Which motor insulation class has the highest temperature rating?

Class B

Does a voltage measurement at the motor indicate whether the motor is under loaded, fully loaded, or overloaded?

Overloaded

When connecting a dual voltage 3 phase motor for low voltage, are the windings connected in series or parallel?

Parallel

What is the rotating coil of an AC motor called?

Rotor

When connecting a dual voltage 3 phase motor for high voltage, are the windings connected in series or parallel?

Series

What is the stationary coil of an AC motor called?

Stator

When a motor application requires a motor to cycles often, what two rated specifications on the motor nameplate should be increased from the normal rating?

Temperature (insulation)

How is a motor rating affecting when operating at altitude above 3300?

The motor rating would be affected because the service factor would be derated

Can a shaded pole be reversed?

Yes it can be reversed

What does maximum rated acceleration time of a motor depend on?

motor frame size