Electric 2B

The ampacity of the conductors from the generator output terminals to the first distribution device(s) containing overcurrent protection shall not be less than _____ percent of the nameplate current rating of the generator.

115

Type MC cable containing four or fewer conductors, sized no larger than 10 AWG, shall be secured within _____ in. of every box, cabinet, fitting, or other cable termination.

12

Conductors supplying several motors shall not be sized smaller than _____ percent of the full-load current rating of the highest rated motor, plus the sum of the full-load current ratings of all other motors in the group, plus the ampacity of other loads.

125

Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating.

125 percent of the motor's full-load current rating as determined by 430.6(A)(1)

The maximum dual-element time-delay fuse branch circuit protection for a single-phase motor is _____ percent of the appropriate current rating found in Table 430.248.

175

What is the nameplate FLA for a 5 hp, 230V, single-phase motor, with 93 percent power factor and 87 percent efficiency?

20A

For a dual-voltage 230/460V motor, the field windings are connected in parallel for _____ operation and in series for _____ operation.

230V, 460V

The maximum rating or setting of an inverse time breaker used as the motor branch-circuit short-circuit and ground-fault protective device for a single-phase motor is _____ percent of the full-load current given in Table 430.248.

250

Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor is based on Table 310.17 and does not extend beyond the motor control equipment enclosure

400

Overcurrent protection for motor control circuits shall not exceed _____ percent if the conductor is based on Table 310.17 and does not extend beyond the motor control equipment enclosure.

400

Dry-type transformers 1,000V, nominal, or less, and not exceeding _____ kVA that are installed in hollow spaces of buildings and not permanently closed in by the structure, shall not be required to be readily accessible

50

The disconnecting means for air-conditioning and refrigerating equipment shall be readily accessible and not more than _____ ft from the air-conditioning or refrigerating equipment.

50

What is the nameplate FLA for a 20 hp, 208V, three-phase motor with 90 percent power factor and 80 percent efficiency?

58A

When a motor starts, the current drawn is at least _____ times the motor FLA; this is known as motor "locked-rotor amperes" (LRA).

6

Stationary generators _____ and less shall be listed.

600V

Motors are used to convert electrical energy into mechanical work and the output mechanical work of a motor is rated in horsepower. 1 hp = _____.

746W

For stationary motors of 2 hp or less and 300V or less on ac circuits, the controller can be an ac-rated only general-use snap switch where the motor full-load current rating is not more than _____ percent of the rating of the switch.

80

The maximum instantaneous trip breaker branch circuit protection for a single-phase motor is _____ percent of the appropriate current rating found in Table 430.52

800

For general motor applications, the motor branch-circuit short-circuit and ground-fault protection device shall be sized based on the _____ values

NEC Table

For general motor applications, the motor branch-circuit short-circuit and ground-fault protection device shall be sized based on the _____ values.

NEC Table

Where a panelboard is supplied through a transformer, the overcurrent protection shall be located _____.

Secondary side of the transformer

A motor can be provided with combined overcurrent protection using a single protective device to provide branch-circuit _____ protection where the rating of the device provides the overload protection specified in 430.32

all of these

A horsepower-rated _____ having a horsepower rating not less than the motor rating shall be permitted to serve as the disconnecting means.

attachment plug and receptacle or flanged surface inlet and cord connector

A _____ shall be located in sight from the motor location and the driven machinery location.

disconnecting means

At Type AC cable terminations, a(an) _____ shall be provided to protect wires from abrasion.

fitting

The radius of the curve of the inner edge of any bend shall not be less than _____ for Type AC cable.

five times the diameter of the cable

In determining the highest rated motor for purposes of complying with 430.24, 430.53(B), and 430.53(C), the highest rated motor shall be based on the rated full-load current as selected _____.

from Tables 430.247, 430.248, 430.249, and 430.250

Transformers are rated in _____.

kVA

Type AC cable and associated fittings shall be _____.

listed

For transformers, other than Class 2 and Class 3, a means is required to disconnect all transformer ungrounded primary conductors. The disconnecting means shall be located within sight of the transformer unless the disconnect _____.

location is field marked on the transformer and is lockable open in accordance with 110.25

Generators shall have the _____ conductor sized not smaller than required to carry the maximum unbalanced current as determined by 220.61.

neutral

Transformers with ventilating openings shall be installed so that the ventilating openings are _____.

not blocked by walls or obstructions

A feeder supplying fixed motor load(s) shall have a protective device with a rating or setting _____ branch-circuit short-circuit and ground-fault protective device for any motor in the group, plus the sum of the full-load currents of the other motors of the group

not greater than the largest rating or setting of the

The motor controller shall have horsepower ratings at the application voltage _____ the horsepower rating of the motor

not lower than

To reverse the rotation of a dc motor, you must reverse the _____.

stator field or rotor field

Smooth-sheath Type MC cable with an external diameter not greater than 3/4 in. shall have a bending radius not less than _____ times the external diameter of the cable

ten

Transformer top surfaces that are horizontal and readily accessible shall be marked _____.

to prohibit storage

Swapping _____ of the line conductors can reverse a three-phase ac motor's rotation.

two

Motors shall be located so that adequate _____ is provided and so that maintenance, such as lubrication of bearings and replacing of brushes, can be readily accomplished

ventilation

The nameplate motor FLA rating describes the motor current rating when it carries its rated horsepower load at its rated _____.

voltage

Each motor used in a continuous duty application and rated more than 1 hp shall be protected against overload by a separate overload device that is responsive to motor current. The overload device for motors with a marked temperature rise 40°C or less, shall be rated at no more than _____ percent of the motor nameplate full-load current rating

125

Motors must be protected against excessive winding heat by a properly sized overload protection device based on the motor _____ current rating.

FLA

Disconnecting means for air-conditioning or refrigerating equipment can be installed _____ the air-conditioning or refrigerating equipment, but not on panels that are designed to allow access to the equipment, and not over the equipment nameplate

On or within

Where air-conditioning and refrigeration equipment is installed outdoors on a roof, a(an) _____ conductor of the wire type shall be installed in outdoor portions of metallic raceway systems that use compression-type fittings.

equipment grounding

Overload devices are intended to protect motors, motor control apparatus, and motor branch-circuit conductors against _____.

excessive heating due to motor overloads and excessive heating due to failure to start

Type MC cable can be unsupported and unsecured where the cable is _____.

fished between access points through concealed spaces in finished buildings or structures

If a motor disconnecting means is a motor-circuit switch, it shall be rated in _____.

horsepower

As current flows through the transformer, the iron core is temporarily magnetized. The energy required to realign the core molecules to the changing electromagnetic field is called "_____ loss."

hysteresis

For other than cord-and-plug-connected portable generators, an emergency shutdown device for a dwelling unit shall be located _____ at a readily accessible location.

outside the dwelling unit

Dual-voltage ac motors are made with two field windings. The field windings are connected in _____ for low-voltage operation and in _____ for high-voltage operation

parallel and series

Dual-voltage ac motors are made with two field windings. The field windings are connected in _____ for low-voltage operation and in _____ for high-voltage operation.

parallel and series