Question 1

With part winding starting, the first winding will ____________________ rapidly if the second windings is not connected within a very short period of time.

Accepted Answer

overheat

Question 2

In part winding starting, neither of the two windings is individually capable of withstanding the starting current for more than a few seconds.

Accepted Answer

In part winding starting, each winding is designed to handle only a portion of the full load current, so neither is capable of withstanding the full starting current for an extended period without risking damage.

Question 3

One advantage of part winding starters is that they provide ____________________ starting because the motor is never disconnected from the power line during the starting time.

Accepted Answer

closed transition

Question 4

Delta connected dual voltage motors are acceptable for part winding starting.

Accepted Answer

Part winding starting is typically used with motors that have two separate windings (dual voltage) designed for wye (star) connection, not delta connection, because in a delta connection, all windings are in series with each other, making part winding starting not applicable.

Question 5

Part winding starting is typically used for motors that supply the moving force for centrifugal pumps, fans, and blowers.

Accepted Answer

Part winding starting is a method used to reduce the starting current of electric motors, and it is commonly applied to motors that drive centrifugal pumps, fans, and blowers, where a reduced starting torque is acceptable and desirable to minimize electrical and mechanical stress.

Question 6

What happens if the second winding is not connected to the power line within a short period of time?

Accepted Answer

The answer of What happens if the second winding is...

Question 7

The thermal capacity of the stator windings greatly limits the length of starting time for a part winding motor. How do you overcome this problem?

Accepted Answer

The answer of The thermal capacity of the stator windings...

Question 8

Motors designed to be used for part winding starting contain two separate stator windings. What are they?

Accepted Answer

The answer of Motors designed to be used for part...

Question 9

Part winding starters provide closed transition starting.

Accepted Answer

Part winding starters provide open transition starting, not closed transition starting.

Question 10

The method of starting in which only half the motor winding is used during starting is called ____________________ starting.

Accepted Answer

The answer of The method of starting in which only...

Question 11

When dual voltage motors are used, the motor must be operated on the high voltage setting of the motor.

Accepted Answer

Dual voltage motors are designed to operate on either of two voltage levels, and they can be configured to run on either the high or low voltage setting depending on the application and power supply availability.

Question 12

Each winding in motors designed for part winding starting is individually protected by ____________________ overload heaters.

Accepted Answer

The answer of Each winding in motors designed for part...

Question 13

To help prevent damaging the first winding, some circuits contain a timer that disconnects power to the motor if the second winding is not energized within a predetermined time. This timer is often called a(n) ____________________.

Accepted Answer

The answer of To help prevent damaging the first winding,...

Question 14

Figure 27-2

In the accompanying figure, why are both overload relays connected in series?

Accepted Answer

The answer of Figure 27-2

In...

Question 15

The thermal capacity of the stator windings greatly limits the length of starting time for a part winding motor. How can you help overcome this problem?

Accepted Answer