Week 14 Journeyman Practice Test 4

49. A plug-in style circuit breaker marked "line" and "load", connected to a interconnected supply in a stand-alone system shall be secured in place by an additional fastner per NEC 408.36(D). Select one: True False

False

50. Health care facilities are required to have emergency systems complying with all the requirements in Article 700. Select one: True False

False

51. The terms "neutral conductor" and "grounded conductor" mean the same thing and can be used interchangeably throughout the NEC. Select one: True False

False

52. When installing the system bonding jumper from the X/O tap of a transformer to the transformer enclosure, as well as any other bonding jumpers the terminal bolt is permitted to go through one of the ventilation slots in the bottom of the transformer. T/F Select one: True False

False

48. Which of the following systems does not have a neutral conductor as defined in Article 100? a. 120 Volt, 1-phase, 2-wire b .208Y/120 Volt, 3-phase, 4-wire c. 120/240 Volt, 1-phase, 3-wire d. 120/240 Volt, 3-phase , 4-wire

a. 120 Volt, 1-phase, 2-wire

26. How much current will each leg of a 12 KW, 240 volt, 3-phase water heater draw? a. 28.9 Amps b. 32.4 Amps c. 86.6 Amps d. 50 Amps

a. 28.9 Amps

33. The maximum short circuit current that can be delivered by a 1000 KVA transformer at 208 Volts with a primary voltage of 12.47 KV and secondary of 208/120 Volts and an impedance of 5.75 percent is _______? a. 48,274 Amps b. 2,775 Amps c. 20,972 Amps d. 83,612 Amps

a. 48,274 Amps

3. A 25 HP, 230/460 volt, 3-phase induction motor with a service factor of 1.15 has a dual element time delay fuse type RK-5 installed as the short circuit and ground fault device. The motor nameplate current is 62/31 Amps. The motor is installed outside and connected to a 480 volt 3-phase supply. What is the correct size or rating of this fuse? a. 60 Amps b. 40 Amps c. 70 Amps d. 50 Amps

a. 60 Amps

11. A limited maintenance electrician may repair or replace electrical installations on systems operating less than _____ volts phase to phase. a. 600 b. 250 c. 480 d. 300

a. 600

31. The church parking lot lighting has a connected current of 7 amps, 240 volts single phase. The farthest luminaire is 800 feet from the panel. What is the percentage voltage drop if 12 AWG copper wire is installed. a. 9.22 b. 4.11 c. 6.75 d. 10.14

a. 9.22

27. In a hospital, the minimum size feeder and overcurrent protection to supply three pieces of x-ray equipment with a momentary rating of 115 amperes each is _____ amperes. a. 97.5 b. 131.5 c. 62.5 Amps d. 187.5

a. 97.5

17. A three phase 400-amp circuit with 2-3/0 AWG THHN/THWN copper conductors inparallel per phase installed in a single conduit is run in the overhead of the building. The circuit is 125 feet long and one part of 9 feet is run above a boiler where the ambient temperature is 105ºF. Does the installation meet the NEC? a. Yes b. No

a. Yes

47. Where the NEC uses the terms "listed" or "labeled" this shall have the same meaning as _________ in Oregon a. certified electrical product b. Labeling by a Special Deputy Inspector c. Listed by an Oregon Testing Laboratory d. Evaluated by an Oregon Field Evaluation Body

a. certified electrical product

19. An inground concrete pool using zinc galvanized rebar must have the rebar bonded to the wire mesh used in the surrounding concrete pool deck. The bonding conductor shall be _____ and be sized at least _____ AWG copper. a. solid, 8 b. stranded, 8 c. stranded, 6 d. solid, 6

a. solid, 8

20. An outside 50 foot run of 2 inch PVC conduit is installed between fixed equipment where the temperature will vary by 75°F over the course of the year. What is the expected change in length of this run of conduit due to the temperature variation? a. 2.28 inches b. 1.52 inches c. 4.56 inches d. 3.04 inches

b. 1.52 inches

4. A 4" x 4" metal wireway is used indoors between two junction boxes. The wireway has 50 - 12 AWG THHN copper conductors. What is the maximum amperage allowed for each conductor? a. 8.3 Amps b. 10.5 Amps c. 14 Amps d. 20 Amps

b. 10.5 Amps

40. What is the cubic inch volume for (4) #12 XHHW conductors terminating on 2 snap switches in a 2-gang box and (2) #12 THHN conductors passing through the box? a. 18 in3 b. 22.5 in3 c. 13.5 in3 d. 10.5 in3

b. 22.5 in3

41. What is the maximum voltage allowed between terminals of two devices in a 2-gang box before an internal barrier is required? a. 299 Volts b. 300 Volts c. 150 Volts d. 277 Volts

b. 300 Volts

32. The maximum exposed unsupported run of Type TC-ER cable is _____ feet a. 3 b. 6 c. 5 d. 4

b. 6

6. A building is allowed to have up to a total of _____ feeder(s) or branch circuit(s) serving it where there are no special conditions and all the feeder(s) or branch circuit(s) originate from the same switchboard. a. 8 b. 6 c. 3 d. 1

b. 6

30. Roof mounted PV modules on a dwelling unit are limited to ______ volts DC. a. 1000 b. 600 c. 300 d. 1500

b. 600

18. An engine generator installed for a single family dwelling would generally follow Article ______. a. 701 b. 702 c. 705 d. 700

b. 702

7. A building is supplied by a 30 amp feeder using 10 AWG copper conductors. The minimum size copper grounding electrode conductor required is ______. a. 10 AWG b. 8 AWG c. 6 AWG d. 12 AWG

b. 8 AWG

36. The rapid shutdown system is to disconnect the _____ power within the array for first responders a. Inverter input b. DC output from array c. inverter output d. Combiner box

b. DC output from array

10. A detached garage is supplied by two branch circuits at 120 volts. One at 15 amps for lighting and one at 20 amps for the required receptacle. The circuits are run with a 12-3 w/G Type UF cable directly buried. Is a grounding electrode required at this building. a. Yes b. No

b. No

29. Motors equipped with _____ are required to be marked with the equipment's rated voltage, number of phases, and power in watts. a. two speed operation b. electrically- powered condensing prevention heaters c. extended motor leads for remote junction box d. auxiliary controls

b. electrically- powered condensing prevention heaters

24. Essential electrical systems shall have a minimum of ____ alternate power sources. a. 3 b. 2 c. 1 d. 4

c. 1

38. Underground conduit, Type RTRC, must be buried a minimum of ____ feet in a class I, Division 1 hazardous location area. a. 0 Feet b. 1 Foot c. 2 Feet d. 3 Feet

c. 2 Feet

42. What is the minimum size THHN or XHHW-2 copper parallel feeder conductors (2 conductors per phase in parallel to the primary of a transformer with both primary and secondary OCPDs? The transformer nameplate ratings are 225 KVA, 480 to 208/120 Volts, delta-wye, Imp 4.76%, Class H insulation 150°C, in type 3R enclosure. a. 400 kcmil b. 350 kcmil c. 250 kcmil d. 300 kcmil

c. 250 kcmil

37. The size of the XHHW-2 copper branch circuit conductors to a variable speed drive controlling a 50 HP 230/460 Volt motor with a nameplate full load current of 100/50 Amps and service factor of 1.25 is? The nameplate of the variable speed drive has an input current rating of 65 Amps at 480 volts, 3-phase.. a. 4 AWG b. 1 AWG c. 3 AWG d. 2 AWG

c. 3 AWG

43. What is the minimum size THHN or XHHW-2 copper parallel feeder conductors (3 conductors per phase in parallel) from the secondary of a transformer with primary and secondary OCPDs? The transformer nameplate ratings are 225 KVA, 480 to 208/120 Volts, delta-wye, Imp 4.76%, Class H insulation 150°C, in type 3R enclosure. a. 250 kcmil b. 400 kcmil c. 300 kcmil d. 350 kcmil

c. 300 kcmil

44. What size XHHW-2 copper branch circuit conductors are required to supply a 10 HP, 230 volt, 1-phase induction motor with a service factor of 1.15? Nameplate current is 45 Amps. The motor is installed outside and connected to a 240 volt 1-phase supply. a. 6 AWG b. 8 AWG c. 4 AWG d. 10 AWG

c. 4 AWG

39. What is the calculated KVA of a dryer in a standard residential dwelling calculation which has a nameplate of 4200w at 240 Volts? a. 4.2 KVA b. 4200 KVA c. 5 KVA d. 5.25 KVA

c. 5 KVA

5. A 40 HP motor with nameplate of 230/460 Volt, 100/50 Amp, SF 1.15, 40C, TEFC is installed for a pump. The pump is served from a 480 Volt Motor Control Center. What is the maximum rating or setting for the overload relay for this motor? a. 65 Amps b. 60 Amps c. 62.5 Amps d. 50 Amps

c. 62.5 Amps

28. In the definition of "Interconnected Electric Power Production Sources" the "primary" source of electricity generally is the _________ a. Engine generator b. Energy storage system c. Service from utility d. Second solar photovoltaic system

c. Service from utility

35. The PV source circuit includes the _______________ a. dc to dc converter input and output circuit b. conductors connecting combiners c. conductors between PV modules and to the input of the inverter d. overall system from PV module to ac interconnection point

c. conductors between PV modules and to the input of the inverter

23. Emergency systems are primary for _________ a. maintaining building operations during a power outage b. firefighting support and smoke exhaust c. life safety and building egress illumination d. keeping process equipment operating

c. life safety and building egress illumination

34. The overcurrent protection in column A of Table 430.72 is to be used when ________ a. 16 AWG or 18 AWG control conductors are installed b. the control conductors extend beyond the controller enclosure c. the motor short circuit and ground fault device does not provide protection in accordance with 430.72(B)(2) d. the motor short circuit and ground fault device does provide protection in accordance with 430.72(B)(2)

c. the motor short circuit and ground fault device does not provide protection in accordance with 430.72(B)(2)

16. A store presently has 1785 fluorescent luminaries each consuming 29.8 watts. The electricity rate at the store is $0.009 per watthour. What is the cost savings per watthour for energy for converting to LED luminaries what consume 11.2 watts each? a. $478.74 b. $297.55 c. $179.93 d. $298.81

d. $298.81

25. For accessibility when installing a receptacle outlet in a commercial facility that has an unobstructed parallel approach to the receptacle, it shall be a minimum of _____ inches above the finished floor. a. 18 b. 12 c. 16 d. 15

d. 15

2. A 24 kW single-phase 240 volt water heater connected to a 208 volt single phase is equal to ______ kw. a. 24 b. 32 c. 21 d. 18

d. 18

13. A Rigid Metal raceway has the following combination of conductors:11 10 AWG THWN3 8 AWG THWN3 4 AWG THW4 2 AWG THWWhat is the minimum size of the raceway? a. 2 1/2 inch b. 1 1/4 inch c. 1 1/2 inch d. 2 inch

d. 2 inch

1. "Stand Alone" systems can power _________ a. Signs b. Roadway hazard warning signs c. Homes of cabins "off the grid" d. All the above

d. All the above

14. A single-phase cord-and-plug-connected room air conditioner shall be provided with one of the following factory installed devices. a. LDCI b. GFCI c. GFPE d. HDCI

d. HDCI

15. A standard 480 Volt delta to 120Y/208 Volt transformer can be supplied at 208 Volts to step up to 480 volts for the rooftop HVAC equipment if __________ a. The manufacturer's sales representative sends a letter saying it is acceptable b. The turns ratio is correct c. The nameplate does not say "supply" and "load" voltage d. The transformer has markings indicating step up application is permitted

d. The transformer has markings indicating step up application is permitted

22. Branch circuit conductors for emergency systems shall be installed entirely in separate raceways and enclosures from normal power distribution except for __________. a. inside automatic transfer equipment b. exit or emergency luminaries c. listed control relay for exit or emergency luminaries d. all the above

d. all the above

46. When the single alternate source of supply for an emergency system is out of service for any reason a _______________ is required to be provided. a. permanently installed switching device b. temporary alternate source suitable for the load c. interlocking between sources d. all the above

d. all the above

8. A Category 3 space is considered _____ space in a health care facility. a. critical care b. support c. general care d. basic care

d. basic care

21. Auxiliary grounding electrodes are permitted by the Code and are required to be connected to the __________ conductor, but the _________ shall not be used as an effective ground-fault current path. a. grounded; equipment grounding bus b. bonding; ground rods c. grounding electrode; conduit d. equipment grounding; earth

d. equipment grounding; earth

9. A control circuit tapped from the main branch circuit ________ considered as an extension of the branch circuit? a.shall be permitted to be b.shall be c. is d. is not

d. is not

12. A plug in style circuit breaker on a panelboard requires ______ when used to provide a backfed connection of a grid interactive alternate energy system inverter. a. a single line diagram of the system b. line side connection kit c. a hold down device d. none of the above

d. none of the above

45. When ground fault protection of equipment is provided for emergency systems the GFPE shall _______ when a ground fault is detected. a. shut down the generator b. trip the overcurrent device c. trip the utility main overcurrent device d. signal that a ground fault exists

d. signal that a ground fault exists