Chapter 11

Question 1

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.

Answer 1

Overload

Question 2

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.

Answer 2

125

Question 3

A/C units that operate at ___ or less may be cord-and-plug-connected.

Answer 3

250 V, 1Ö

Question 4

If the service factor and temperature rise are not marked on the nameplate, the nameplate current should be multiplied by ___%.

Answer 4

115

Question 5

The winding type shall be given on the nameplate of a DC motor.

Answer 5

True

Question 6

The overcurrent protection for an MCC may be located ahead or within the MCC.

Answer 6

True

Question 7

Table ___ is used to determine the current ratings of 3Ö AC motors.

Answer 7

430.250

Question 8

The ___ branch circuit is the point from the last fuse or circuit breaker protecting the motor circuit out to the motor.

Answer 8

Motor

Question 9

The code letter or locked-rotor amps shall be listed on the nameplates of motors rated ___ HP or more.

Answer 9

.5

Question 10

The rated frequency shall be given on the nameplate of a motor controller.

Answer 10

True

Question 11

Small motors rated 150 W or less shall be marked “Impedance Protected.”

Answer 11

False

Question 12

Equipment shall be located within ___’ and be visible to be considered within sight.

Answer 12

50

Question 13

Cord-and-plug-connected compressors and equipment shall be rated no greater than ___ A on 120 V circuits.

Answer 13

20

Question 14

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.

Answer 14

True

Question 15

Branch-circuit conductors supplying a single motor shall have an ampacity of ___% of the FLC rating as indicated on the appropriate FLC table.

Answer 15

125

Question 16

The ampere rating of a fusible disconnect is determined by the size of fuse being used in the motor branch circuit.

Answer 16

True

Question 17

Motor nameplates shall include the rated horsepower if ___ HP or more.

Answer 17

1-8

Question 18

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.

Answer 18

115

Question 19

A(n) ___ device is a pilot light, buzzer, horn, or other type of alarm.

Answer 19

Indicating

Question 20

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.

Answer 20

Hermetic

Question 21

A ___ is an assembly of one or more enclosed sections with a common power bus and primarily containing motor control units.

Answer 21

Motor control center

Question 22

The ___ is the device in a motor circuit which turns the motor ON or OFF.

Answer 22

Controller

Question 23

A plug and receptacle may serve as a controller for stationary motors up to 2 HP.

Answer 23

False

Question 24

A/C and refrigeration equipment with several motors can be considered as a single machine.

Answer 24

True

Question 25

The length of flexible cords used to supply A/C units shall not exceed ___’ for 120 V units.

Answer 25

10