FINAL EXAM JUNIORS MECHATRONICS
4
. How many conductors are in this
Hickey
A ___ has a much smaller shoe and must be positioned several times along the conduit in order to properly bend.
Connector's
A ___ only functions it to connect sections o conduit together.
18 teeth per inch
A hacksaw or band saw is outfitted with a___ blade should be used to cut IMC or Rigid
Mechanical
A___ bender uses a ratchet mechanism to help bend larger conduit.
3
An acceptable voltage drop, according to the NEC, is ________ Percent.
Dog bend
An___ bend consists of two bends, both
Conduit fittings
Are accessories that provide mechanical rather than electrical connections.
Portable band saws
Are power tools used to cut all types of conduct.
Handy boxes
Because ___ have threaded openings instead of knockouts, they are neater and sturdier.
Indentation
Connectors use a slit- ring that grabs the conduit as a nut is tightened.
Three or four
Depending on the type of power system, the busway will contain ___ busbars.
Conduit
Electrical wiring that runs must be protected by pipe or tubing called ___.
Conductors are pulled
Fish tape, blow line, and power pullers are three basic methods by which ____.
40
For larger Jobs, it can be about___percent more expensive use connectors to change the direction of the conduit.
Rigid
IMC and___ are considered to be interchangeable in most applications.
125
In order to correctly size the circuit protection of a motor, you must multiply the rated FLA by ______ percent.
Damage the insulation of the wires Cause a heat build up in the box Be a violation of NEC code All of the above
Jamming electrical wires into an electrical box may ____.
One and one-half
NEC Article 314.16(C)(1) states that the cross-sectional area of a conduit body (with 2 entries) must have a cross-sectional area that is at least ____ the cross-sectional area of the largest conduit (or tubing) to which it is attached.
Determine the offset depth needed
Step one of the four step procedure used to determine and locate the bend centers of an offset bend is:
bender shoe
The ___ depends on the size and type of conduit used and determines the radius of the bend.
Leg length
The ___ of a 90 degree bend is the longest length from the end of the straight section of pipes to the bend.
Pipe Jaw
The ___ of a bench vise are made in the form of a V so that the jaws come together to grasp a pipe.
positioning indicator
The ___ shows where the back of the conduit will be after a 90 degree bend.
Clips
The bus plug has ___ on the back that allow(s) it to attach to the bus bars. Clips
disconnects
The current rating, voltage rating, and number of poles (number of phases) must all be considered when selecting ______ for an application.
Measure and mark 10 inches on an appropriate stick of conduit
The first of the five steps used to determine bender take up is:
Determine the number of each different size/type of conductor installed in the conduit
The first step in determining conduit size when conductors are of different ize/type is to ___.
Refer to chapter 9 tables of 5 of the NEC
The first step in determining conduit size when conductors are of different size/type is to _____.
G=LL+LS-LC
The formula___ can be used to determine the length of conduit required to bend a 90 with proper leg and stub length
Raceway
The function of a ______ is to safely and efficently provide electrical power
Prongs
The hacksaw's___are used to hold the blade in the frame
disconnect
The only purpose of a _______ is to supply a manual means of cutting power to a load.
Voltage (or line drop)
The smaller the wire, the lower the _______.
3/4"
The threads on a piece of conduit must have a standard NPT___ per foot taper.
Yoke
The three main types of pipe vices are the ___ vise, the chain vise,and the bench vise.
disconnects
The type and color of insulation, the conductor material (ie copper or aluminum), and its amacity all affect the selection of _______ for an application
insulation
The wire's ________ protects the wire from short circuits and other environmental conditions, a conductive material.
fuses
Thermally and magnetically-triggered are two methods by which ________ can be tripped
SA
This type of conductor insulation is made of silicone and rubber and is used in application that require higher than normal operating temperatures
Percentage of fill
To help ensure that conductors are not broken or damaged during installation, the NEC uses ____ as a guideline for raceway (conduit or tubing) selection.
Tables C1-C12A
When all conductors are of the same size (gauge) and type, NEC ______ can be used to easily select the appropriate conduit (or tubing) sizes.
table 5
When all of the conductors entering an electrical box are of the same size, the proper box size selected by determining the total number of conductors and then referring to _____ of the NEC. Tables C1-C12A
STG
When referring to a flexible metal conduit connectors, an___connector includes a neoprene sealing gasket to provide a better seal.
Take care not to pinch fingers.
Which one of the following is one of the six safety rules to follow when operating a bench vise?
Disconnects
___ are devices which cut power to the load.
Hand Benders
___ are most often used to bend 1/2 inch to 2 inch IMC and rigid
Flexible conduit
___can either be metallic or non metallic
Compression
___connections usually provide the most secure connections for IMC/rigid connectors and couplings.
Both A and C (fuses and circuit breakers)
provide overcurrent protection from overloads and short circuits.
Fusible disconnect and Circuit Breaker
provides both a disconnect and overcurrent protection.
Take-UP
the first thing an electrician should do when beginning work with a bender is to determine the___of the bender being bent
JUNCTION/FUNCTION
the primary function of a______box is to house electrical connections.
Barbed
three types of conduit straps are the one hole, two hole, and ____
Pipe cutters
when cutting thin-wall conduit____tend to leave more of an inside lip that a hacksaw.
