Industrial Electrician Practice Test

These questions are part of the practice quiz. Start practicing

• What is another term for a grounded conductor?
• How is a transformer rated for power output?
• The trip rating of a circuit breaker used as the main protective device in a panel board cannot exceed?
• What is the main purpose of a current transformer (CT)?
• Under normal conditions, how does the voltage measured between line and neutral of a 3-phase, 4-wire "Y" system compare to the voltage measured line to line?
• Which of the following symbols represents a resistor in a circuit diagram?
• Which inscription on a circuit breaker indicates it is designed for use with both copper and aluminum wire?
• What is the main purpose of overload heaters in a motor circuit?
• When inspecting rubber insulated gloves daily, which two elements should be checked?
• A switch labeled CO/ALR can be used with what type of wire?
• In what condition should you avoid using heat-shrink insulators?
• Why can a lead acid battery be considered an explosive hazard?
• What is the role of a circuit breaker in an electrical system?
• What is the typical color code for ground wires in electrical installations?
• Which tool is commonly used to measure electrical current?
• In electrical theory, what does the term "impedance" refer to?
• The purpose of the OSHA lockout/tagout procedure is to ensure that?
• Which guideline must be met when using the 10' Tap Rule?
• What does CT stand for in electrical terminology?
• What is the required size of a junction box with two 4" conduits, one 2" conduit, and two 1" conduits for a straight pull?
• All of the following are correct formulas for ohm's law except?
• What is the minimum distance required between ground rods?
• Which device is used to prevent electrical overloads and short circuits?
• Which of the following is NOT a purpose of grounding and bonding?
• What type of wire is standard for low-voltage milliamp signal systems?
• Which of the following is used to alter the speed of a 3-phase squirrel cage induction motor?
• How can the rotation of a 3-phase motor be changed?
• Service entrance conductors may be spliced only when?
• How much total wire is required if the distance is 73 feet, with added tails of 5 and 3 feet?
• What does the term "ampacity" refer to in electrical wiring?
• What is the voltage ratio for dual-voltage motors?
• A motor control center is a group or combination of?
• What is installed at an expansion joint to provide a continuous ground between two sections of cable tray?
• PVC conduit, fittings, and connectors range in size from 1/2" to what maximum size?
• What is the significance of the location of a conduit body's cover?
• What is the primary purpose of a grounding system?
• In Ohm's Law, what does the letter E represent?
• What is the maximum number of bends allowed in a run of conduit without requiring additional pull points?
• Which of the following is NOT a component of a conventional circuit breaker?
• If the turn ratio of a transformer is 4000:5 and the primary voltage is 2000 volts, what is the secondary voltage?
• What is used to determine the minimum cable tray width for wires smaller than 4/0?
• What is the power consumption in a circuit with a voltage input of 120V and an R-Value of 40 ohms?
• What must the neutral of a subpanel be?
• What is the function of a circuit breaker in an electrical system?
• What is the multiplier for calculating a 45 degree offset when conduit is being bent?
• How many amperes will flow in a circuit containing only resistance if the resistance is 10 ohms and the voltage is 120 volts?
• What could result from an improperly made wire splice or connection?
• What is the material found between the plates of a capacitor where the electric field appears?
• What is the primary purpose of a ground rod?
• What is the source voltage in a circuit that consumes 1,200 watts at a current of 5A?
• What is the main purpose of a control transformer in a motor starter?
• Where should a GFCI be installed when an extension cord is being used?
• According to standard lockout/tagout procedures, who is authorized to remove the lock and tag?
• Splicing is permissible on all of the following conduit bodies except?
• For a 10" offset on a 15° angle, what is the required distance between the centers of the bends?
• If the potential across the circuit is 480 volts and the current is 50 amps, what is the resistance of the circuit?
• Where should a stress cone be used?
• Which of the following is a common tool used for measuring electrical current?
• Which of the following can change the direction of a 3-phase motor?
• If a transformer has a primary voltage of 480 volts and a secondary voltage of 240/120, where is the secondary voltage measured?
• Plastic and porcelain are types of what in electrical applications?
• Which set of receptacle terminal color codes and wire color codes is correct?
• In a class 1, division 1 area, what type of electrical fittings are required?
• Which of the following carries power from a main panel board to various subpanels?
• What is a common application for aluminum conduit?
• What is the main function of a capacitor in an electrical circuit?
• Which of the following is a primary function of a surge protector?
• What type of conduit fitting is typically used in the middle of a long run of rigid metal conduit to aid in wire pulling?
• When combustible vapors are present, which hazardous location is it considered?
• What type of electrical device is primarily used for changing the voltage level in an AC system?
• What is the most common service voltage used in a temporary power panel?
• What does capacitance permit the capacitor to do?
• What is a characteristic of parallel circuits compared to series circuits?
• What is the main purpose of a dynamometer?
• What is the primary purpose of a circuit breaker?
• What type of electrical component is a transformer?
• Which device is primarily used for overcurrent protection in electrical circuits?
• What is the purpose of sealing cable ends while storing reels of cable?
• Which two devices are most commonly used for overcurrent protection?
• When using a megger, how does an electrician confirm that the phase conductors are free from insulation damage?
• Which of the following statements about resistance heat tracing is true?
• In electrical wiring, what is the purpose of conduit?
• Which electrical component is crucial for properly measuring current flow in a circuit?
• How much larger must a pull or junction box be when making a U-Pull?
• What does a continuity test check in electrical components?
• What does the amperage of tap conductors have to meet according to the 10' Tap Rule?
• What is the primary function of a contactor in a motor control circuit?
• Which of the following is used to connect the grounded conductor to a grounding electrode?
• Until determined otherwise, how should all electrical equipment and conductors be treated?
• What is the ratio of power in watts to the total volt-amps of an AC circuit known as?
• What is the total length of multi-conductor wire needed for a pull between a starter and a 3-phase motor with given tails?
• What is one of the key advantages of using GFCI protection?
• In a motor starter, how is the seal-in auxiliary connected with the start button?
• What is shown on a sectional drawing?
• If a circuit's frequency is 15 cycles per 1/4 second, what is the Hertz (Hz) rating of the circuit?
• What is the main purpose of a lockout/tagout procedure?
• What is the term used to express the relationship between the transformer primary winding and the secondary winding?
• The type of drawing that shows the general arrangement of service entrance equipment and panel boards is called?
• Why is it important to select the proper rope for a cable pull?
• Cable trays are usually supported by all of the following means except?
• In which type of wiring system are junction boxes commonly used?
• What type of enclosure is approved for general purpose indoor use and not dust or drip proof?
• What is the standard phase color coding for 120/240V single-phase systems?
• What can directly affect the rate of power loss in a conductor?
• A cable rated for 5 KV can safely carry what maximum voltage?
• What type of conduit body features a threaded straight hub on each end?
• What does HOA usually mean in a motor control circuit?
• Which color wire is typically used for ground in most electrical systems?
• When bending a 90° stub up using 15° segment bends, how many bends must be made?
• What is a system of grounding electrodes interconnected by grounding conductors that are buried in the earth to provide lower resistance?
• In which unit is true power measured?
• When selecting locations for junction and pull boxes, all of the following should be considered except?
• What is a fish tape primarily used for?
• Which type of heat trace cable cannot be cut to length in the field?
• What is the primary function of an electrical panel?
• What safety device prevents overcurrent in an electrical circuit?
• Which of the following types of clothing should not be worn while performing electrical work?
• Where is the easiest location to reverse leads in order to change the rotation direction of a 3-phase motor?
• Which of the following is true regarding circuit grounding?
• All of the following are basic elements of a motor circuit except?
• What is a common consequence of overloading an electrical circuit?
• What is the primary function of a transformer in an electrical circuit?
• What is the color code for crimp connectors used with #22-#16 AWG wire?
• What occurs when the seal-in (holding) contact on a motor starter is opened?
• Which switch combination is correct for controlling a light from three different locations?
• What is the result of opening the holding contact in a motor starter?
• What do thermal overloads specifically protect within a starter?
• What is the standard size wire for 120-volt motor control systems?
• Which of the following types of fuses is best for protecting a motor feeder?
• When installing a 277-volt 15-amp switch and a 120-volt 15-amp switch in the same box, what is required?
• What does a solenoid do?
• Which statement accurately describes a parallel circuit?
• Four-inch square boxes are available with all of the following depths except?
• Which type of transformer is used to step down voltage for measurement and control systems?
• What is the purpose of a Myers hub?
• Which material is NOT acceptable for use in guardrails of a guardrail system?
• Which of the following conditions must indoor switchgear be protected against?
• How should several #12 AWG conductors be arranged on a fish rope when pulling them together?
• What type of cable is typically used in high-voltage applications?
• In a 3-wire push button start/stop circuit, which contacts are typically normally closed?
• How much larger must a pull or junction box be when making an angle pull?
• Which type of conduit is most appropriate for a corrosive environment?
• What is a drawing that shows the connection between point A and point B called?
• What must be included when installing different voltage switches in the same box?
• In a 3-phase, 4 wire, 120/240 volt delta-connected service, what is the high leg's voltage to ground?
• What article of the NEC covers grounding?
• What is used to make a slight change in elevation in a cable tray system?
• What is a section of cable tray that makes two vertical 90-degree turns called?
• What is considered a standard fuse size in electrical systems?
• What would be found in a class 1 location?
• What type of wiring system is typically used for residential electrical installations?
• Why should the test leads of a megger never be touched while in use?
• What term describes the components located between the service drop and the main disconnect?
• What insulation material is commonly used for low-voltage electrical wires?
• What is an acceptable protection technique for electrical equipment in hazardous locations?
• How many inches is equivalent to one circular mil?
• Where is nonmetallic conduit (PVC) typically used?
• Which test equipment can confirm a suspected short circuit or ground fault in a 3-phase circuit?
• The minimum acceptable DC megohm resistance of a 4,160 volt motor is approximately?
• What is the peak value of a 120V circuit?
• What is a common reason that a split phase system may fail to start?
• Where are the overload heaters normally located in a motor circuit?
• Which conductor has the least resistance?
• What do you call the device that limits current and provides protection in a circuit?
• When facing the busbar of a panel, in respect to A and B phase, where is C phase located?
• What is the primary use for type USE cable?
• What is required at the Xo terminal of a transformer?
• The first step in making an exothermic (cad weld) connection is to?
• What is the primary purpose of a circuit breaker?
• Which of the following is used to connect a 1/2 inch drain to the bottom of a 3/4 inch tee?
• What is the amperage in a 24-volt circuit with 4 ohms of resistance?
• What functions can a multimeter test for?
• What is the minimum required length of a ground rod?
• Where is the cover located on a type LB conduit body?
• For 4/0 and larger wire, what is used to determine the minimum cable tray width?
• When making a high-voltage splice, all of the following are part of the splicing procedure except?
• When is a seal not required in a conduit entering a switch in a class 1, Division 1 location?
• What device is used to bypass and discharge electrical surges?
• Which of the following components is essential for providing safe shutdown in motor circuits?
• Which of the following is one way to control voltage at a substation?
• What is the area of a rectangular piece of material measuring 4 feet by 10 feet?
• What does a one-line diagram with simplified symbols indicate?
• What type of switch will provide three-point control for a light?
• Which electrical component stores energy in an electric field?
• What type of circuit breaker uses a bimetallic strip for conducting current?
• What does the thermal overload protect in a starter or MCC?
• Which condition must be maintained for an ungrounded neutral?
• In a sine wave, what is the term for how many times per second an identical pattern repeats itself?
• What is the recommended temperature rating for most electrical cables in residential applications?
• What instrument is commonly used to measure electrical current?
• What is the typical voltage of a residential electrical system in North America?
• How should a voltmeter be connected in a circuit?
• What is created in a conduit run by making two equal bends in opposite directions?
• How many overload units are required for a 3-phase motor?
• A heat trace cable is installed on a line that will be insulated. When will the cable be megged?
• How is heat trace cable positioned when installed for anti-freeze protection?
• Which statement about a tapped transformer is correct?
• Which of the following components is part of a dual element fuse?
• How should heat-shrink insulators be installed?
• According to NEC section 406.3(A), which branch circuits are required to have grounded receptacles?
• What type of conduit support can be used to prevent making an offset into a conduit fitting/box?
• What is the primary purpose of a circuit breaker?
• What role does the seal-in contact play in a motor starter circuit?
• What does a main disconnect do in an electrical system?
• Which type of transformer is typically connected in series?