Chapter 11 Flashcards
A(n) ___ is the operation of equipment in excess of normal, full-load current rating, or a conductor subject to a current in excess of the rated ampacity.
Overload
The branch-circuit conductors on the line side of the controller for a multispeed motor shall be sized at ___% of the highest of the FLC ratings shown on the motor nameplate.
125
A/C units that operate at ___ or less may be cord-and-plug-connected.
250 V, 1Ö
If the service factor and temperature rise are not marked on the nameplate, the nameplate current should be multiplied by ___%.
115
The winding type shall be given on the nameplate of a DC motor.
True
The overcurrent protection for an MCC may be located ahead or within the MCC.
True
Table ___ is used to determine the current ratings of 3Ö AC motors.
430.250
The ___ branch circuit is the point from the last fuse or circuit breaker protecting the motor circuit out to the motor.
Motor
The code letter or locked-rotor amps shall be listed on the nameplates of motors rated ___ HP or more.
.5
The rated frequency shall be given on the nameplate of a motor controller.
True
Small motors rated 150 W or less shall be marked “Impedance Protected.”
False
Equipment shall be located within ___’ and be visible to be considered within sight.
50
Cord-and-plug-connected compressors and equipment shall be rated no greater than ___ A on 120 V circuits.
20
The larger a motor’s full-load table current, the less the percentage of the increase in sizing the thermal protector that is an integral part of the motor.
True
Branch-circuit conductors supplying a single motor shall have an ampacity of ___% of the FLC rating as indicated on the appropriate FLC table.
125
The ampere rating of a fusible disconnect is determined by the size of fuse being used in the motor branch circuit.
True
Motor nameplates shall include the rated horsepower if ___ HP or more.
1-8
The disconnecting means for motor circuits are required to have an ampere rating of at least ___% of the FLC rating of the motor for circuits rated 1000 V or less.
115
A(n) ___ device is a pilot light, buzzer, horn, or other type of alarm.
Indicating
A(n) ___ refrigerant motor-compressor is a combination compressor and motor enclosed in the same housing, having no external shaft or shaft seals, with the motor operating in the refrigerant.
Hermetic
A ___ is an assembly of one or more enclosed sections with a common power bus and primarily containing motor control units.
Motor control center
The ___ is the device in a motor circuit which turns the motor ON or OFF.
Controller
A plug and receptacle may serve as a controller for stationary motors up to 2 HP.
False
A/C and refrigeration equipment with several motors can be considered as a single machine.
True
