48 - Manual Motor Control and Overload Protection

Bimetallic overloads do not allow you to adjust the trip point.

True

False

False

Which of the following is a function of motor control?

Speed control

Short circuit

Disconnect

Motor starter

None of the above

A

A motor starter is the same as a motor controller.

True

False

False

The contacts of a manual starter will remain in the actuated position when power is lost.

True

False

True

Which of the following is a basic requirement for a typical motor installation?

Controller

Short circuit protection

Disconnect

All of the above

None of the above

D

Some manual motor starters use a special sensing coil that verifies the presence of incoming voltage to open the starter contacts when the voltage is below a preset level.

True

False

True

The type of manual starter used for three-phase motors is a __________.

Fractional horsepower starter

Integral horsepower starter

Single-pole starter

Two-pole starter

B

Which type of overload uses a coil to sense the level of motor current?

Solid-state overload

Magnetic overload

Manual overload

All of the above

None of the above

B

__________ protection on a manual starter will prevent the automatic restart of a motor when recovering from a power loss.

Undervoltage

Overvoltage

Overcurrent

All of the above

None of the above

A

Magnetic contactors open and close their contacts through the use of a magnetic coil.

True

False

True

A magnetic overload includes a dashpot which allows adjustments to the response time of the overload.

True

False

True

NEMA overloads often use melting alloy thermal overloads.

True

False

True