Question 1

When selecting heater elements for the overload relays, the electrician should remember that each of the relays carries only of the motor current.&#10;A)a fifth&#10;B)a quarter&#10;C)a third&#10;D)half

Accepted Answer

Each of the relays carries only half of the motor current, as typically, a motor will have two overload relays in its circuit, each handling one phase in a single-phase system or one of the phases in a three-phase system.

Question 2

Part winding starters are designed to be used with squirrel cage motors having two separate and parallel stator windings.

Accepted Answer

Part winding starters are specifically designed for use with squirrel cage motors that have two separate stator windings. Part winding starters are designed to be used with squirrel cage motors having two separate and parallel stator windings.

Question 3

Part winding starting has many applications in air-conditioning systems.

Accepted Answer

Part winding starting is commonly used in air-conditioning systems to control the starting current and reduce stress on the motor. Part winding starting is widely used in air-conditioning systems to reduce the starting current and torque of the compressor, which helps to minimize voltage drop and prevent tripping of protective devices.

Question 4

Part winding motors are different in construction from standard squirrel cage motors.

Accepted Answer

The answer of Part winding motors are different in construction...

Question 5

Part winding starters are not suitable for use with delta-wound, motors.&#10;A)single-voltage&#10;B)single-phase&#10;C)dual-voltage&#10;D)dual-purpose

Accepted Answer

Dual-voltage motors have both a high voltage and a low voltage winding, which allows for the use of a part winding starter. Delta-wound motors, on the other hand, only have one winding and cannot be used with a part winding starter. Single-voltage and single-phase motors also do not have multiple windings and cannot be used with a part winding starter. Dual-purpose is not a relevant option in this context. Part winding starters are designed to be used with dual-voltage motors that have two sets of windings with the same number of coils, each set designed for a different voltage. Delta-wound motors have three sets of windings with different numbers of coils, which makes them incompatible with part winding starters.

Question 6

One disadvantage of the two-step part winding starter is that .&#10;A)it provides closed transition starting&#10;B)it is almost always an incremental start device&#10;C)it uses only half-size contactors&#10;D)it requires additional voltage reducing elements

Accepted Answer

The two-step part winding starter is almost always an incremental start device, which means that it delivers less torque during the initial stages of starting. This can be a disadvantage in some applications where full starting torque is needed from the beginning. The other options are not disadvantages of this type of starter.

Question 7

The thermal capacity of the motor limits the length of acceleration on the first winding to approximately seconds, depending on the connected load.&#10;A)5&#10;B)15&#10;C)25&#10;D)45

Accepted Answer

The thermal capacity of the motor limits the length of acceleration on the first winding to approximately 5 seconds, depending on the connected load.

Question 8

In the part winding motor, the stator windings may be connected or delta connected, depending on the motor design.&#10;A)A&#10;B)M&#10;C)Y&#10;D)Z

Accepted Answer

In part winding motors, the stator windings can be Y (star) connected or delta connected, depending on the motor design. This allows for reduced starting current and provides flexibility in starting and running the motor.

Question 9

Part winding starters can be used in as many applications as other, more expensive types of reduced voltage starters.

Accepted Answer

Part winding starters are limited to specific applications where the motor is designed for part winding start and cannot be used as universally as other types of reduced voltage starters, which offer more flexibility and control options for a wider range of applications.

Question 10

Part winding motor windings are intended to operate in series.

Accepted Answer

Part winding motor windings are intended to operate initially in parallel to start the motor with a reduced voltage, and then all windings are connected for normal operation, not in series.

Deck 28: Part Winding Motor Starters