Electrical NCCER test Questions And Answers

In a guardrail system, the guardrails can be made of any of the following EXCEPT: - ANS ropebanding If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the circuit is: - ANS 9.6 ohms A UL listed rod type grounding electrode must have a minimum length of: - ANS 8' What is the MINIMUM number of overload sensing units required for all three phase motors? - ANS 3 In a circuit of pure capacitance, the current leads the voltage by an angle of: - ANS 90-degrees The standard unit for a measuring the cross-sectional area of a wire is the: - ANS circular mil The drawing scale is MOST likely to be found in which of the following drawing locations? - ANS the drawing little block The length of a bare copper conductor in a ground ring MUST be buried no less than 2.5' below grade and with a length of at least: - ANS 20 ft. When installing heating cables for anti-icing systems, cable patters should be in a: - ANS Serpentine An auxiliary holding contact (seal-in) on a NEMA starter is indicated by the terminal marking: - ANS A1 & A2 The neutral bus in a sub panel: - ANS is bonded The PEAK voltage in a nominal 120/208 VAC system is: - ANS 208V. THWN conductors have an outer jacket made of: - ANS nylon What is shown on a sectional drawing? - ANS Cutaway view of a building Who is allowed to remove another electrician's tag or lock from any valve, switch, or piece of equipment without proper authorization? - ANS no one. The MAIN purpose of a revision block on an electrical drawing is to: - ANS note any changes to the original drawings Which of the following is the classified location where combustible vapors are always present? - ANS class I Div I With a row of 3-4" conduits and second row of 3-2" and 2-1" conduits for an angle pull box what is the MINIMUM distance between the opposite walls of the pull box? - ANS 32" Exposed field-routed electrical conduit SHOULD be installed so that it: - ANS is plumb and level When wiring control push button control circuit, the auxiliary holding contact (seal-in) is wired with the start button in: - ANS parallel Ferrous metal raceways, boxes, fittings, and supports must be protected against: - ANS corrosion Which of the following factors is used to control the speed of an induction motor? - ANS Frequency Electrical hand tools that use a regular 120-volt system MUST be 3-wire grounded UNLESS the: - ANS tool is double-insulated and is approved by an independent testing facility. A conductor with 220 mils of insulation would have insulation thickness of: - ANS 0.22" What is the purpose of sealing cable ends that are in storage? - ANS to keep moisture from entering it Which one of the fuses is a standard size according to the NEC? - ANS 3 A 1000 KVA three phase transformer has a secondary voltage of 208/120. What is the secondary full load amperage? - ANS A megohmmeter will be used to check a cable. The electrician MUST be sure that the circuit is - ANS de-energized and locked, tagged out, and tested. A protective device for limiting voltage spikes by discharging or bypassing surge current is called a: - ANS surge limiter What is the resultant distance between center bends for a 10-inch offset at 15 degrees? - ANS 38.7 In. What is the symbol for the SECONDARY side of a transformer? - ANS x The most common transformer found on an industrial site is: - ANS Single phase step down Applications for heat tracing systems with self regulating control include those requiring a narrow operating range and: - ANS temperature sensitive fluids With a row of 3-4" conduits and second row of 3-2" and 1-1" conduits on each side for a straight pull box what is the MINIMUM distance between the opposite walls of the pull box? - ANS 32" As the mechanical load increases on a squirrel cage induction motor: - ANS torque decreases and stator current increases When installing cables smaller than 4/0 in a cable tray, the allowable cable fill area must not be less than the sum of the cable: - ANS cross-sectional areas. The meter used to measure pulling tension is known as: - ANS dynamometer On a push button, normally close contacts are generally used to open a circuit to : - ANS initiate a stop or off circuit function How should heat-shrink insulators be installed? - ANS the insulator should be slipped over the connector and heat should be applied for a few seconds The conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system is called a grounding: - ANS electrode conductor A material with poor electrical conducting properties is a good - ANS insulator A current transformer has a rating of 4000:5. If 2000 amps load is on the primary, the secondary output would produce: - ANS 2.5 amps A 1500 KVA three-phase transformer has a secondary voltage of 480/277. What is the secondary full load amperage - ANS Type LB conduit body has the cover on: - ANS the back What is the purpose of lockout/tagout? - ANS prevent operation Why should the proper rope be selected for a cable pull? - ANS to maximize safety An electrician that attempts to install or remove energized fuses will be exposed to the risk of an electrical shock and an electrical: - ANS arc.