The electrical NCCER test

Which Article of the NEC covers grounding?

article 250

Which of the following is a 90 degree, explosion proof fitting?

GUAL

What is a dropout plate?

Metal plate with a curved surface for cable to follow as it passes from the tray

All of the following are common service voltages in the United States EXCEPT:

372/575 3-PHASE, 4-WIRE

What does a GFCI breaker do?

Opens a circuit to prevent operation of an electrical device

What will happen when one or more coils in a winding are grounded?

The motor will automatically blow fuses

Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts, with a 200-watt lamp. What is the total connected load?

13.3 amps

The must be grounded in a bussed gutter if used as the main service equipment.

Neutral busbar

When wall mounting cable tray, ensure that

The building structure is strong enough to support the tray system

The purpose of sealing cable ends when reels of cable are in storage is

To keep moisture from creeping in

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

A moisture seal

A good electrical connection should

Be mechanically and electrically secure

The symbol normally used for duplex

Circle with two parallel lines drawb through it

Disconnecting means are covered in

NEC Section 110-22

In relation to switches, the term throw refers to the

Number of internal operations that a switch can perform

A 3-phase, 4-wire, 480v service requires ______ current transformer(s)

3

Services conductors and equipment are covered in

NEC Article 230

The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be ______ receptacles

Grounding

A transformer with the primary of 400 turns and a secondary of 300 turns has a _____

Step-down turns ratio of 4:3

The circular mil is based on the

Cross-sectional area of the wire

Of the termination classes listed below, ____ is the only one that provides a seal against external elements.

Class 1

Unless otherwise noted. the calculations in AC circuits _____ values.

Rms

When the coil turns are increased the _____

Induced voltage is increased

As the temperature surrounding a self-regulating heating cable rises, the ____

Resistance of the polymeric core increases

The motor type that has the highest starting torque is the ____ motor.

Capacitor-start

For a given number of poles, the ____ determines the speed of an AC motor.

Frequency

Both induction and synchronous motors operate on the principle of a rotating ____ field

Magnetic

A transformer has 200 turns in the primary, 150 turns in the secondary, and 120VAC applied to the primary. The voltage across the secondary is:

90Volts

The output capacity of a motor is rated in

Horsepower

The synchronous speed at which a pole, 60 Hz induction motor operates is rpm.

1,800

The sine of 0 degree is

0

Meters used in AC circuits indicate the

Effective

The component labeled 7 in figure 1 is a(n)

End seal

In an AC circuit containing resistance only _____ will flow if the resistance is 10 ohms and the voltage is 120V.

12A

The _____ rotor types are generally rugged.

Squirrel cage

Proofs tests are made at_ of the original factory voltage.

60%

Which type of heating cable cannot be cut and terminated in the field?

Mineral insulated

The secondary of a CT under load should not be opened because of_.

Induced high voltage

In a transformer ______

Electromagnetic Induction Ocurs

When a ground rod is installed, the top of the rod must be positioned ______ grade.

Flush with or below

When making offset bends, the two kicks must be made perfectly parallel or the resulting offset will have a _____

Crooked Bend

conduit that requires a 90 degree change in direction, except 42.All of the following types of condulet may be used as a pulling point for _____

C

To be effective, a grounding system must limit the voltage on the electrical system and protect it from all of the following, except _____

Undervoltage conditions

What is the MOST common service used in a temporary power panel?

120/240 volt, 1-phase, 3-wire

What are the 2 MOST common types of overcurrent protective devices?

Circuit breakers and fuses

What instrument is used to perform an insulation-resistance test on a 480- volt motor winding?

Megohmmeter

Why is a seal installed in a run of conduit in a Class I location?

Prevent the passage of explosive gases in the conduit

Which of the following is the correct formula for OHM's law?

I=E/R

Which of the following testing instruments operated on the current transformer principle?

Clamp-on ammeter

A 120/208 volt feeder consists of an 800 ft run of 500 kcmil aluminum wire in conduit. This feeder has 5% voltage drop. What will the phase-to-phase voltage be at the load end?

197.60 volts

What is voltage?

Electromotive force

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

Wiring diagram

What does HOA usually mean in a motor control circuit?

Hands of Automatic

What is the standard wire size system used in the United States?

AWG

A switch labeled "AL-CU" can be used with what type of wire?

Aluminum Copper or Copper Clad Aluminum

What type of conduit fitting is usually placed in the middle of a long run of rigid metal conduit to provide access for pulling wire?

C

What is the largest size of aluminum rigid conduit couplings?

6"

What is the purpose of the thermocouple?

To measure temperature

A brass-colored terminal on a receptacle indicates that it should be used to connect what type of wire?

Hot wire

What is the standard length of rigid conduit?

10 FT

An angle or U-pull is made with 14 wire or larger. The distance between each raceway entry inside the box and the any less than how many times the trade opposite wall of the box shall NOT be diameter of the largest raceway?

6 times

Where should stress cone be used?

High Voltage Termination

A cable rated for 5KV insulation can safely carry what MAXIMUM voltage?

5,000 volts

What is the PRIMARY consideration in selecting the proper rope for a cable pull?

Safety

Which of the following statements describes the operating features of a thermal overload relay?

The greater the overload, the shorter the time of tripping.

Normally, the easiest place to reverse the leads to change the direction of rotation of a 3-phase motor is at the

Motor Starter

What is the largest size conductor that can terminate on a 20amp receptacle?

12awg

Why can a lead acid battery be an explosive hazards?

Hydrogen gas is produced during charge and discharge

What MAXIMUM number of bends is allowed between fittings in one conduit run?

4 quarter bends or 360 degrees

What size wire is standard for a 120- volt motor control systems?

#14

In all cases where live parts are normally exposed on the front of switchboards or motor control centers the working space in front of such equipment MUST be what MINIMUM length?

3Ft

What is the interrupting rating of a fuse?

The maximum value of current that the fuse is designed to interrupt

What is the PRIMARY purpose of P&ID?

Provides scale drawings and piping and instrumentation control systems

A "megger" will be used to check a cable. The electrician MUST be sure thát the circuit is

De-energized and locked, tagged out, and tested

What is the symbol for the primary side of a transformer?

H

What is the function of a ballast in a flourescent fixture

Steps up the voltage

An electrical fitting can be made explosion proof in which of the following ways

Using an amorphous sealed device

Cable trays are usually supported by all the following means EXCEPTS?

#9 wire

A 1 line diagram with simplified symbols indicates the

Interconnections and component parts of an electrical circuit

What is the purpose of Lockout/Tagout?

Prevents operation

Which of the following factors is used to control the speed of an induction motor?

Frequency

A 10-inch offset at 30 degrees is being made. What is the distance between center-to-center bends?

20 inches

What is an acceptable protection techniques for electrical equipment in hazardous locations?

Use duct-ignition proof equipment

What test or equipment can be used to locate a suspected short circuit in 1- phase of a 3-phase motor?

"megger"

What will happen if moisture is inside a cadweld mold while the weld is being performed?

The cadweld mold could explode

What is produced in a conduit run by making 2 equal bends in opposite direction?

Offset

4 inch square boxes are available with all of the following depths EXCEPT

1 inch

What is installed at an expansion joint to provide a continuous ground between 2 sections of cable tray?

A bonding jumper

What color identifies an insulated, grounded number 4 conductors?

Green

Why is it important to torque bolts when busbars are connected?

Decreases resistance on the connection

All the following are protective devices for motors EXCEPT

SOLENOID

Service conductors are sized based on what factor?

The total calculated load of the building

A holding contact na motor starter is normally connected in parallel with the

Start push button

The number of complete AC cycles per second is called the

Frequency

Which of the following components is part of a dual element fuse

Rejection clip

The potential across the circuit is 480 volts and the current is 50 amps. What is the resistance of the circuit?

9.6 ohms

What NEC table indicates the size of service conductors?

Table 310-16

What instrument is used to measure CURRENT?

Ammeter

What are the 3 elements in every electrical circuit?

Power source, switch, and load

How does a battery produce voltage?

Chemical reaction