Electrical Motors Single Phase 080304bA

Question 1

What are the three point test procedures for single phase power?

Answer 1

Black to White = Zero Volta
Black to Ground = Zero Volts
White to Ground = Zero Volts

Question 2

What is service factor?

Answer 2

The multiplier used to calculate how much over the nameplate rating the electric motor can be drive without overheating

Question 3

Split phase motors are classified by the way the two windings are used to start and run the motor. What are the 4 classifacations?

Answer 3

Resistance split-phase motor (split phase)

Capacitor-start motor

Permanent-split capacitor motor

Two-value capacitor motor

Question 4

What is the purpose of a centrifugal switch mounted inside a motor?

Answer 4

Serves to disconnect the auxiliary or start winding when the motor nears full-load speed

Question 5

When and how is a centrifugal switch actuated?

Answer 5

Actuated by the centrifugal force produced by the spinning rotor and the contact opens at about 75% of the rated speed of the motor

Question 6

What kind of motor do most conventional forced air furnaces use?

Answer 6

Resistance splt-phase motors