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NCCER ELECTRICAL CERTIFICATION TEST 1 2025|ACTUAL 100QUESTIONS AND ANSWERS|ALREADY GRADED A+
Typology: Exams
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What instrument is used to measure current? Ammeter Which plan indicates the location of structures and equipment on a property? Detail drawing Generally, the most ideal conductor is made of: Copper What is the standard size system used in the US? AWG What is insulating tape? Non-Conductive adhesive tape Which of these is used as a guide to assist cables entering a conduit? Sheave
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 push button operators typically used in motor controls Open and closed
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 What is shown on a sectional drawing? Cutaway view A conductor with 220 mils of insulation would have an 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 13 & 14 When is it required that conductors be derated? When there are 4 or more current-carrying conductors in a conduit Verifying the presence or absence of voltage should be performed only by: Qualified individuals 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?
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: Answer: 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? Ground grid
Cable markings show all of the following except: Ampacity How many paths for a 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?
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 seconds. What is the Hertz (Hz) rating of the circuit? 60 Hz The neutral bus in a sub panel is isolated from the ground 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 Induction 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 switch gear of an industrial facility? CAT III The length of bare copper conductor in a ground rig MUST be buried no less than 2.5' below grade and with a length of at LEAST: 20 feet What is the voltage on the high leg in the figure? 208 volts
What contacts are closed during 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 capacitor-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 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 and 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 500
Insulators The NEC requires conduit and fittings installed in hazardous locations to be wrench tight to a 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 label of: A1 & A 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?
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
With a circuit of a lagging power factor of 0.5 what should be done? Add a capacitor to increase the power factor Which contact(s) are open when the switch is in the START mode? 1 & 2 The name for the tester used to verify phase sequence is known as: Phase rotation meter The term "ladder tray" refers to a tray that: Consists of two channels connected by rungs When using a power cable puller, the rope attached to the cable is wrapped around a drum called a: Capstan Which type of raceway is NOT suitable to service where exposed to severe damage?
Electrical metallic tubing When Verifying that a circuit has been de-energized ensure FIRST that : Its locked out and tagged out A conduit piston (mouse) is used for what application? installing pull line Damaged tools or extension cord should be____. Removed immediately from use a tagged " Do Not Use" The standard time rating for a continuous duty rated electric motor is: 3 hours What type of NEMA class enclosure is approved for general purpose indoor use and is NOT dust-tight or drip-poof? Type 1
