Deck 5: Trolley Busways

Question 1

What shape are the standard segments used to construct trolley systems?

A) straight
B) semicircular
C) triangular
D) circular

Answer 1

A

Question 2

What is the role of center feed-in boxes?

Answer 2

Center feed-in boxes are used to bring the electrical supply cables to the trolley busway. Each box has two adjustable couplings (one on each end of the box) connected by removable flexible jumper wires. In addition, the feed-in box has two sets of concentric knockouts that provide a means of bringing the feeding conduits into the duct system.

Question 3

The equipment attachment plugs used with the duct system are , which eliminates several problems when portable tools having three-phase motors are used.

A) grounded
B) phase-rotated
C) phase-reversed
D) polarized

Answer 3

D

Question 4

How is a 4-wire rubber cord used with trolleys?

Question 5

The only tool needed to join the industrial-type trolley duct is a .

A) hammer
B) welder
C) screwdriver
D) rivet gun

Question 6

The trolley busway is equipped with two busbars.

A) gold
B) copper
C) silver
D) platinum

Question 7

Why is the structure of cord grips important?

Question 8

The 50-ampere lighting circuits used in the trolley systems are approved by .

A) Entela
B) TUV Rheinland of North America
C) Underwriters Laboratories
D) Wyle Laboratories

Question 9

A lighting system composed of outlets and a conduit system is not easily adaptable to changing requirements.

A) fixed
B) suspended
C) trolley
D) polarized

Question 10

The lighting trolley is available in 5-ft (1.5-m) and 10-ft (3-m) sections, which are joined by couplings.

A) straight
B) plain
C) double
D) circular

Question 11

The industrial trolley bus is a -ampere, enclosed busbar electrical system.

A) 50
B) 75
C) 100
D) 125

Question 12

The couplings joining lighting trolley sections make a connection, electrically and mechanically, between two duct sections and permit free passage of the trolleys along the duct runs.

A) positive
B) negative
C) neutral
D) perfect

Question 13

What advantages does a suspended lighting system have?

Question 14

Bus drop safety springs are used to maintain the proper tension on the horizontal and vertical cord runs. These springs are available with 40-, 80-, and pound ratings.

A) 100
B) 120
C) 150
D) 180

Question 15

The power supply from the panelboard is fed into a busway run through a _.

A) drop-in assembly
B) standard hanger
C) feed-in adapter
D) trolley run

Question 16

Luminaires are equipped with , which cause the lamps to fire at different times.

A) transistors
B) integrated circuits
C) lead-lag adders
D) phase adders

Question 17

A section provides the means for removing or inserting trolleys. This section contains two hinged doors that open when a lever is raised.

A) run
B) drop-out
C) switch
D) curved

Question 18

Messenger wires supporting the trolley lighting circuit are adjusted for tension by located at the ends of the runs.

A) pulleys
B) bolts
C) cables
D) turnbuckles

Question 19

Describe the luminaires used in the manufacturing area.

Question 20

Commonly, 4-conductor type SJ rubber cords are used to connect various machines; the colors of the individual conductors of the cord are black, white, red, and .

A) magenta
B) green
C) purple
D) blue