FINAL EXAM JUNIORS MECHATRONICS

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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.


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