First 2B Test
All of these
Luminaires shall maintain a minimum clearance from the closet storage space of _____.
All of these
Which of the following types of luminaires can be installed in a clothes closet?
Modular voltage are color coordinated
Which of the following is true regarding modular wiring systems?
Not greater than the rating of setting of the
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.
False
A 120V section of lighting track that is continuously loaded shall not exceed 12 ft in length, in accordance with 220. 43(B).
45
A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The total capacitance is:
A and B
A _____ rated in amperes shall be permitted as a controller for all motors.
True
A _____ rated in amperes shall be permitted as a controller for all motors.
Disconnecting means
A _____ shall be located in sight from the motor location and the driven machinery location.
9 leads
A delta-connected motor has:
All of these
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.
Any of these
A motor disconnecting means can be a listed _____.
120 degrees apart
A polyphase synchronous motor has three stator windings that are:
EMS
A type of system that can be used to control both lighting and HVAC equipment is a(n):
conveyor
A typical constant-torque load would be a(n):
Water-cooled
According to NEMA definitions, which of the following is a type of totally enclosed motor?
Greater than the true power
According to the power triangle, the apparent power is:
All of these
Article 410 covers luminaires, portable luminaires, lampholders, pendants, incandescent filament lamps, arc lamps, electric-discharge lamps, and _____, and the wiring and equipment forming part of such products and lighting installations.
15v, 30v
Article 411 covers lighting systems and their associated components operating at no more than _____ ac or _____ dc where wet contact is likely to occur
Suspended lighting fixtures
Chandeliers are a type of:
True
Each motor shall be provided with an individual controller.
T-5s
Energy legislation promotes the replacement of full-wattage fluorescent lamps with higher- efficiency types, such as:
Instant start lamp
Fluorescent lamps with a single pin at each end are known as:
In direct proportion to the speed
For a constant-torque load, the horsepower increases and decreases:
Shall be installed
For existing installed luminaires without disconnecting means in indoor locations, other than dwellings and associated accessory structures, a disconnecting means _____ in fluorescent luminaires that utilize double-ended lamps (typical fluorescent lamps) at the time a ballast is replaced.
Output capacity of a motor
Horsepower is used to rate the:
Horsepower
If a motor disconnecting means is a motor-circuit switch, it shall be rated in _____.
True
If more than one luminaire is installed on a branch circuit that is not of the multiwire type, a disconnecting means is not required for every luminaire when the light switch for the space ensures that some of the luminaires in the space will still provide illumination.
Increases
If the area of the plates of a capacitor is increased, the amount of capacitance: decreases
10 Hz
If the time for one cycle is 0. 1 second, the frequency is:
By some angle between 0 and 90 degrees
In a circuit that has both capacitance and resistance, the current will lead the voltage:
are in phase
In the phase angles of two sine waves are both 0 degrees, then the waves:
Any of these
Insulated secondary circuit conductors of low-voltage lighting systems shall be _____.
300
Motor control circuit conductors that extend beyond the motor control equipment enclosure shall have short-circuit and ground-fault protection sized not greater than _____ percent of the value specified in Table 310. 15(B)(16) for 60o C conductors.
True
Motor control circuits shall be arranged so they will be disconnected from all sources of supply when the disconnecting means is in the open position.
8
No parts of cord-connected luminaires, chain-, cable-, or cord-suspended luminaires, lighting track, pendants, or paddle fans shall be located within a zone measured 3 ft horizontally and _____ ft vertically from the top of the bathtub rim or shower stall threshold.
On wooden floors
Open motors having commutators or collector rings shall be located or protected so that sparks cannot reach adjacent combustible material. This shall not prohibit the installation of these motors _____.
A and b
Poles over 20 ft. in height above grade, without a hinged base, that support luminaires shall have an _____.
1hp
Several motors are permitted to be supplied by a single branch circuit as long as each motor is no larger than:
6
Surface-mounted fluorescent luminaires in clothes closets shall be permitted on the wall above the door, or on the ceiling, provided there is a minimum clearance of _____ in. between the luminaire and the nearest point of a storage space.
Xl=2nfl
The formula for inductive reactance is:
Full load
The motor _____ currents listed in Tables 430.247 through 430.250 shall be used to determine the ampacity of motor circuit conductors and short-circuit and ground-fault protection devices.
Plainly indicated
The motor disconnecting means for a motor shall _____ whether it is in the open (off) or closed (on) position.
All of these
The motor disconnecting means shall not be required to be in sight from the motor and the driven machinery location, provided _____.
Apparent Power
The power factor can be defined as the ratio of true power to:
15 %
The power factor of an induction motor at no-load conditions can be as low as:
Apparent Power
The product of the source voltage and the total current is:
Current to respect to time
The self-induced voltage across an inductance is produced by a change in
Metal halide lamps
The type of high-intensity discharge (HID) lamp that has excellent color rendition is the:
A and b
Track lighting shall not be installed _____.
three
Unless overload protection is provided by other approved means, the minimum number of overload units required for a three-phase alternating- current motor is ____
10A
What is the current flow in a purely resistive AC circuit if the resistance is 15 ohms and the voltage is 150v?
40 Hz
What is the frequency of an AC waveform that completes 20 cycles per half second?
2:1
What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary?
400 w
What is the true power in a 2A series RL circuit with a 100Ω resistor?
True
When electric-discharge and LED luminaires that are designed not to be supported solely by the outlet box are surface mounted over a concealed outlet box, the luminaire shall provide access to the wiring within the outlet box by means of suitable openings in the back of the luminaire.
80
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.
True
A branch-circuit overcurrent device can serve as the disconnecting means for a stationary motor of 1/8 hp or less.
Transformers
A device that uses electromagnetic induction to transfer electrical energy from one circuit to another is a(n):
Shall
A luminaire marked "Suitable for Wet Locations" _____ be permitted to be used in a damp location.
7''
A medium-size motor has a frame number of 284T. The D dimension of this mother is
30v, 60v
Article 411 covers lighting systems and their associated components operating at no more than _____ ac or _____ dc.
125
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.
Maintained
Coves for luminaires shall be located so that the lamps and equipment can be properly installed and _____.
zero
In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is:
6-8 times
In a split-phase motor, how much greater is the starting current when compared to the full- load current?
Combustible materials
Lamp holders shall be constructed, installed, or equipped with shades or guards so that _____ is not subjected to temperatures in excess of 90o C (194o F).
Cornea
Light enters the eye through a transparent layer called the:
True
Low-voltage lighting systems shall be listed or assembled with listed components.
False
Low-voltage lighting systems can be concealed or extended through a building wall, floor, or ceiling without regard to the wiring method used.
10
Low-voltage lighting systems shall be installed not less than _____ ft. horizontally from the nearest edge of the water in pools, spas, fountains, or similar locations, unless permitted by Article 680.
Any of these
Luminaires attached to the framing members of a suspended ceiling shall be secured to the framing member(s) by mechanical means such as _____.
Type o lamps
Luminaires containing a metal halide lamp (other than a thick-glass PAR lamp) shall be provided with a containment barrier that encloses the lamp, or shall be provided with a physical means that only allows the use of a(n) _____.
Induced high voltage
Opening the secondary circuit of a current transformer under load will cause a dangerous level of:
True
Surface-mounted fluorescent or LED luminaires are permitted within the closet storage space if identified for this use.
Highest starting torque
The capacitor-start motor is the single-phase motor type that has the:
False
The connected load on lighting track is permitted to exceed the rating of the track under some conditions.
rated full-load speed
The value indicated in rpm on the nameplate is the:
7
Torque requirements for motor control circuit device terminals shall be a minimum of _____ lb-in. (unless otherwise identified) for screw-type pressure terminals used for 14 AWG and smaller copper conductors.
North
When used outdoors, photosensors should be aimed due:
True
Where more than one motor disconnecting means is provided in the same motor branch circuit, at least one of the disconnecting means shall be readily accessible.
True
Where the motor short-circuit and ground-fault protection devices determined by Table 430.52 do not correspond to the standard sizes or ratings, a higher rating that does not exceed the next higher standard ampere rating shall be permitted.
3,500 k
Which color temperature produces a balance between warmth and coolness?
Wound rotor induction motor
Which motor should be used for applications that require frequent starts without overheating the motor?
Photo sensor
Which of the following are often used in conjunction with time clocks to turn off lighting when it is no longer needed?
Electronic instant start
Which type of ballast has the highest system efficiency?
125 percent of the motor's full-load current rating as determined by 430.6(A) (1)
Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating.
Operating at warmer temps
Which of the following will shorten the life of a filament in an incandescent lamp?
True
Motor controllers and terminals of control circuit devices shall be connected with copper conductors unless identified for use with a different conductor.
Included high voltage
Opening the secondary circuit of a current transformer under load will cause a dangerous level of:
Constant wattage transformer
Which of the following is an HID ballast category?
True
Luminaires made of insulating material that are directly wired or attached to outlets supplied by a wiring method that does not provide a ready means for grounding attachment to an equipment grounding conductor shall be made of insulating material and shall have no exposed conductive parts.
6
Closet storage space is defined as a volume bounded by the sides and back closet walls extending from the closet floor vertically to a height of _____ ft. or the highest clothes-hanging rod at a horizontal distance of 2 ft. from the sides and back of the closet walls.
Recognized wire method
Luminaires designed for end-to-end assembly, or luminaires connected together by _____, can contain a 2-wire branch circuit, or one multi-wire branch circuit, supplying the connected luminaires. One additional 2-wire branch circuit separately supplying one or more of the connected luminaires is permitted
Through wiring
Luminaires identified for _____, with an integral outlet box in accordance with 410.21 shall be permitted to be used as a conductor raceway.
Dark red bricks
Which of the following materials absorbs the most light?
The stationary windings of AC motors
DC injection braking is used on:
Ventilation
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.
True
Outdoor luminaires and associated equipment can be supported by trees.
Wear gloves to protect finish
Which of the following is true regarding the storage and handling of lighting fixtures?