Exam 19: Motor Controls

Magnetic overload devices are the most accurate type of device for electrical protection.

If a normally operating motor draws 75 amps on startup, it will most likely draw ____________________ amps when running.

An inherent motor protector is a ____.

The best way to repair a defective relay is by ____________________.

A set of contacts are closed when the relay is energized. These contacts are classified as normally closed.

The locked rotor amperage, LRA, of a motor is typically five times higher than the full load amperage, FLA, of the motor and can be as high as seven times the FLA.

The service factor of an electric motor is determined by ____.

Which of the following overload devices is not affected by ambient temperature?

Technician "A" says that if you take a voltage reading from terminal "L1" to terminal "T1" on a contactor whose coil is energized, you should read zero volts. Technician "B" says that contactors can only have normally open contacts. Which of the following statements is correct?

Auxiliary contacts are usually rated at a lower amperage than the contactor's primary contacts.

Beside maintaining pressure on the contacts for current carrying capacity, the pressure springs have a second important function. This is to ____.