Question 1

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?

Accepted Answer

A)   Technician "A" is correct. Technician "B" is correct.
B)   Technician "A" is correct. Technician "B" is incorrect.
C)   Technician "A" is incorrect. Technician "B" is correct.
D)   Technician "A" is incorrect. Technician "B" is incorrect.

Question 2

An inherent motor protector is a ____.

Accepted Answer

A)   circuit breaker
B)   motor starter overload
C)   thermally activated device in the motor winding
D)   line fuse

Question 3

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

Accepted Answer

A)   National Electrical Code
B)   National Electrical Manufacturers Association code
C)   motor's reserve capacity
D)   the required wire size supplying power to the motor

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

The answer of The best way to repair a defective...

Question 6

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.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A)   solder pot
B)   magnetic
C)   bimetal
D)   time-delay fuse

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

The answer of If a normally operating motor draws 75...

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A)   keep the contacts in line
B)   help obtain equal contacts against the stationary contacts
C)   slow down the pull of the armature into place to reduce the noise
D)   increase the power required to close the contacts

Exam 19: Motor Controls

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?

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

An inherent motor protector is a ____.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 19: Motor Controls

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?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An inherent motor protector is a ____.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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