Question 1 of 15
What is the primary function of a motor starter?
Motor starters protect the motor and control its operation.
Question 2 of 15
Which standard covers industrial control systems, controllers, and contactors rated up to 600 volts?
NEMA ICS 2-2000 specifies standards for motor control devices.
Question 3 of 15
What is the primary reason for a large inrush current when starting an induction motor?
The low impedance during startup causes a large inrush current.
Question 4 of 15
What is back EMF?
Back EMF is a counter voltage generated when the motor rotates.
Question 5 of 15
What is the typical range of locked-rotor current (LRA) compared to the full-load current (FLC)?
LRA is significantly higher than FLC.
Question 6 of 15
According to NEC, at what percentage of the switch's ampere rating can a general-use snap switch be used as a motor controller?
NEC 430.83(C)(2) dictates this percentage.
Question 7 of 15
What is the unit used to rate motor starters?
Motor starters are primarily rated in horsepower (HP) and amperes.
Question 8 of 15
What does FLC stand for?
FLC is the motor's full-load current.
Question 9 of 15
According to NEC 430.22(A), motor branch-circuit conductors must be sized at what percentage of the motor's FLC?
The conductors must be sized at 125% of the FLC.
Question 10 of 15
What is the recommended size of a motor starter for a 10 HP, 460V motor based on the provided example?
The example indicates a NEMA Size 1 starter.
Question 11 of 15
What is the ampacity of the conductors (wires) for a motor with an FLC of 14A, according to NEC?
Conductor ampacity = 14A * 1.25 = 17.5A.
Question 12 of 15
What percentage of the FLC are inverse-time circuit breakers rated for short-circuit and ground-fault protection?
Inverse-time breakers are rated at 250% of the FLC.
Question 13 of 15
What percentage of the FLC are instantaneous circuit breakers rated for short-circuit and ground-fault protection?
Instantaneous breakers are rated at 800% of the FLC.
Question 14 of 15
According to the provided text, what is the rating of a dual-element time-delay fuse used for motor protection?
Dual-element fuses are rated at 175% of the FLC.
Question 15 of 15
For a motor with an FLC of 14A, what size time-delay fuse would be appropriate, based on the given example?
Fuse Size= 14A * 1.75 = 24.5A ? 25A
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