Question: A contactor’s LRA rating may be:

Answer: 4 to 5 times as high as its FLA rating.

Question: A device that does not switch on and off motors directly is a:

Answer: Light-duty relay.

Question: A rate compensated type motor overload device is the:

Answer: General Electric Thermotector.

Question: A serious problem common only to three phase motors is:

Answer: single phasing

Question: A variable frequency drive is a system for controlling the rotational speed of an electric motor by:

Answer: Controlling the frequency of the power supplied to it.

Question: Heavy duty relays are not suitable as switching relays because they have:

Answer: Larger contacts with more resistance.

Question: Magnetic overload relays:

Answer: Are made up of a sealed tube completely filled with a fluid.

Only slightly affected by ambient temperatures.

Are current sensitive.

Question: Motor protection devices can either be temperature actuated, current actuated, or a combination of current and temperature.

Answer: True

Question: Normally open contacts on a relay will read:

Answer: Infinity or OL when the relay is de-energized and 0 Ω when energized

Question: Pilot-duty overloads operate like:

Answer: Relays.