NCCER ELECTRICAL TEST

The NEC recommends maintaining voltage within a 3% drop. If a branch circuit operates at 240 volts AC. What is the minimum circuit operating volt?

232

What is the name of the connecting device shown in the diagram?

Split-bolt

The volt amperes in an AC circuit is the same as

Apparent power

What is the voltage drop for a #8 (16.510 cmil) copper wire at 120v. 215 feet one way and a load of 39amps?

10.5

If a voltage source of a circuit provides 240 volts and there are 5 ohms of resistance, how much current is in the circuit?

48 amps

What should be done to change rotation of a 3 phase motor?

Swap any 2 T leads

What instrument is used to measure current?

Ammeter

Which plan indicates the location of structures and equipment on a property?

Site

Generally , the most ideal conductor is made of:

Copper

What is the standard size system used in the united states?

AWG

What is insulating tape?

Non-Conductive adhesive tape

Which of these is used as a guide to assist cables entering a conduit?

Piston

Which of the following is not a reason why electrical systems must be grounded?

Limit the potential between ungrounded conductors

What type of conduit body is characterized by a threaded straight hub on each end?

C

A megger will be used to check an in-service cable. The Electrician MUST be sure that the circuit is:

De-energized and locked tagged out, and tested

Rubber gloves MUST be electrically tested at MAXIMUM intervals of:

6 months

A dangerously high voltage is produced when someone opens the secondary circuit of a:

Current transformer

Which choice best describes the two types of pushbutton operators typically used in motor controls

Open and closed

In the event of an emergency where the lockout/ tagout device is left secured, who can remove the lockout/tagout device?

Authorized supervisor

A drawing showing a point A to point B hookup of conductors is called a:

Wiring diagram

A NEMA type___ enclosure is both watertight and corrosion- resistant.

4X

What's the MAIN characteristic of a confined space?

Limited access and egress

Which of the following BEST describes where the type and size of overcurrent protection is found?

Panelboard schedule

A Type "X" conduit body has how many conduit entries

4

What test equipment can be used to test the condition of insulation in electrical apparatus?

Megohmmeter

The opposing force to a flow of alternating current is called:

Reactance

That is a trapeze type support

Two threaded rods supporting a channel or strut

The opposition to current flow referred to as:

Resistance

The type of mounting used for lighting fixtures is indicated in the:

Electrical drawings

Verifying the presence or absence of voltage should be performed only by:

Qualified individuals

What is shown on a sectional drawing?

Cutaway view of a building

A conductor with 220 mils of insulation would have insulation thickness of:

0.22''

The recommended method of attaching self- regulating heating cables to pipes is by using:

Fiberglass tape

An auxiliary holding contact ( seal- in) on a typically NEMA starter is indicated by the terminal marking:

A1 & A2*

When is it required that conductors be derated?

When there are four or more current- carrying conductors in a conduit

The conductors used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding:

Electrode conductor

The equipment grounding conductor is used to interconnect and bond:

Non- current- carrying metal parts

The ungrounded conductor of a 240/120 three phase Delta 4 wire system that has the higher voltage to ground MUST be identified with the color:

Orange

The AIC Rating of an overcurrent protection device represents its:

MAXIMUM fault current the device will interrupt

The resistor alloy- heating element used in power- limiting heating cables has a:

Positive temperature coefficient

What is a system of grounding electrodes interconnected by grounding conductors that are buried in the earth to provide lower resistance?

A ground grid

Cable markings show all of the following EXCEPT

Ampacity

How many paths for current flow are in a current consisting of 4 resistors in parallel?

4

Horsepower ratings given to electric motors are related to the motors power

Input

PVC conduit, fittings and connectors range in size from 1⁄2 inch to:

6 inches

Which of these is pulled through a raceway to test for obstructions before a cable pull?

Mandrel

Which type of transformer core assembly offers low resistance to magnetic lines of force?

Iron

according to NEC Article 240.4(D) (5),12 AWG copper shall be protected against overcurrent by a device with a MAXIMUM ampacity of

20 amps

An electrician reporting to the work area notices that the temporary wiring has been damaged. What should the electrician do?

immediately report it to the supervisors

An assembly containing two or more insulated conductors and having an overall jacket is known as a:

Cable

To test the insulation resistance between the heating cable conductors and the metallic grounding use a;

Megohmmeter

What is the total resistance of a circuit that has aa 50- chm resistor, a 75- ohm resistor, and a 100- chm resistor in series?

225 ohms

Time delay fuses are MOST commonly used in circuits subject to what type of current?

Surge (in rush)

All parts of a metal cable tray MUST be bonded together and:

Grounded

The frequency of a circuit is 15 cycles per 1⁄4 second: What is the Hertz (Hz) rating of the circuit?

60

The neutral bus in a sub panel

Is isolated from the grounded bus

Which symbol represents the overload relay in the schematic diagram?

OL

THE transformer coils of the primary and secondary share NO electrical connection, but current flows through them due to:

Mutual inductions

A NEMA type___ enclosure offers only protection against incidental contact

1

Which of the following category ratings would a meter need to have to take voltage readings at the service switchgear of an industrial facility?

Cat 111

The length of bare copper conductor in a ground ring MUST be buried no less than 2.5' below grade and with a length of at LEAST:

20 ft

What is the voltage on the high leg in the figure?

480 volts

Various MINIMUM requirements have been set forth pertaining to overcurrent devices by the

NEC

What will be the center-to-center measurement for two 30 degree bends in an offset bend with a height of 18 inches?

36 inches

A swivel joint connection is to be made in a cable tray installation. What Must be installed

A Flexible bonding jumper

Which of the following is the classified location where combustible dust is always present?

Class 2 Div 1

What connector should be used to splice a 15 KV shielded cable?

Compression

What contacts are closed in the RUN mode?

1 & 3

The turns ratio of a 3 phase 13.8kV transformer is 115 to 1. What is the output voltage of the secondary

120 volts

A reduction in capacitance of a capacitator- start motor results in reduced

Speed

According to the NEC, where is the "C" phase system to be located ( viewing from the front) with respect to the A and switchboard?

Right

Before using a multimeter to check voltage on a breaker you should:

Check the meter with a known power source

Which of the following inscriptions on a circuit breaker indicates that the circuit breaker is designed for use on both copper and aluminum wire?

AL/CU

Materials made of copper or silver are considered

Semi conductors

An insulated type 600 volt crimp terminal for a 12-10 AWG is typically identified by which color code?

Yellow

What is the MINIMUM length pull box that can be placed in a 2 inch conduit run where the conductors will be pulled straight..

16 inches

The NEC allows copper busbars to carry 1000 amps per square inch, if a bus bar measures 1⁄4 inch X 2 inches how many amps is this bar allowed to carry

500

The outer covering on a liquid - tight flexible metal conduit is used for

Moisture seal

The wattage output of series resistance heating cables depends on the total circuit length and:

Resistance

Percent slip of an induction motor refers to the

the ratio of synchronous speed to rotor speed to rotor speed of the motor

A 10 inch offset at 30 degrees is being made what is the distance between center to center bends

20 inches

What protects the wires from the sharp edges of the conduit is joined to the metal?

Couplings

Compounds made of porcelain and plastic are used as____

Insulators

The NEC requires conduit and fitting installed in hazardous locations to be wrench tight with MINIMUM of how many engaged threads?

4

What two purposes do measuring tape in conduit serve?

it can spread a uniform film of pulling compound inside the conduit and provide an accurate measure

IEC style contactor coils are marked with the labels of:

A1 & A2

What is the source voltage in a circuit that consumes 1200 watts at a current of 5 amps

240 volts

If a 90 degree stub to be bent is using 10 degree segments, how many bends are required?

9

In hazardous locations where metal conduit is required , the conduit MUST be threaded with

Standard threads

A current transformer has a rating of 4000: 5 if 1000 amps load is on the primary, the secondary output would produce

1.25 amps

For a given number of poles, What determines the speed of an AC motor?

Frequency

Which type of conductor is approved for installation in a wet location?

THHW

The conducting connection, wheather intentional or accidental between any of an electrical system is a:

Short circuit

Which type of transformer has its windings connected in series?

A Wye transformer

When terminating the feeders to the main on switchgear, the feeders MUST be braced to withstand:

Arc flash energy

The device used to prevent moisture from accumulating in hazardous wet locations is called a:

Drain seal

When climbing a ladder ALWAYS face the ladder and:

Maintain three point contact when climbing

What type of bend is used to change conduit elevation to clear an obstruction and then return to the original eleva

Saddle

With a circuit of a lagging power factor of 0.5 what should be done?

Add a capacitator to increase the power factor

Which contact(s) are open when the switch is in the START mode?

1 & 2