Journeyman Electrician Practice Test
100% Correct!!
Electrical Generator works on the principle of: - ANSWERFlemings Right hand rule
Which of the following quantity is the same in a series electrical circuit: - ANSWERElectrical current
The transformer oil used in transformers acts as: - ANSWERBoth insulating material and coolant
Induction motor during no load condition will have a power factor in the range: - ANSWER0.2
The NEC states each building or other structure shall have only one disconnecting means unless
_____. - ANSWERThe multiple disconnecting means consists of no more than six, and are housed in
separate enclosures with a main service disconnecting means in each enclosure.
At buildings where communications systems are likely to be used, an intersystem bonding
termination shall be provided for the communications systems at an accessible location at the
service equipment. It shall be an aluminum or copper busbar not less than ¼ in. thick x 2 in. wide and
be of sufficient length to accommodate at LEAST _____ terminations for communications systems in
addition to other connections. - ANSWERThree
The ampacity of a conductor is defined by the NEC to be the maximum current, in amperes, a
conductor can carry continuously under the conditions of use without exceeding ______. -
ANSWERIt's temperature rating
A disconnect switch enclosure installed in a Class II, Division 2 location shall be listed as _____. -
ANSWERDustthight
The interior of enclosures or raceways installed underground shall be considered as a _____ location.
- ANSWERWet
Determine the ampacity (current-carrying capacity) of four (4) size 1/0 AWG THW copper current-
carrying conductors installed in a common raceway with an ambient temperature of 86 degrees F. -
ANSWER120 amperes
,The NEC defines a continuous load to be a load where the maximum current on the circuit is
expected to continue for at LEAST____ hours or more. - ANSWERThree
Given: You have determined a conductor has a computed ampacity of 75 amperes. What is the
MAXIMUM standard ampere rating of the overcurrent protection device the NEC permits to protect
this circuit where this is not a motor circuit or part of a multioutlet branch circuit supplying more
than one receptacle? - ANSWER80 amperes
A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty, ac motor has a full-load running current
rating of _____. - ANSWER143 amperes
Which of the following is permitted in the dedicated electrical space above an indoor installed 3-
phase, 480Y/277-volt panelboard? - ANSWERsprinkler protection
Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight (8) size
6 AWG copper conductors with THHW insulation, when installed in a 50 foot conduit run. -
ANSWER1¼ in.
Where exceptions are not applicable, when a feeder supplies a continuous load of 240 amperes, the
overcurrent protection device protecting this circuit shall have a rating of at LEAST _____. -
ANSWER300 amperes
Liquidtight flexible metal conduit (LFMC) shall be securely fastened WITHIN _____ of each box or
other conduit termination. - ANSWER12 inches
Where a pull box to be installed will contain conductors of size 4 AWG and larger, and a straight pull
of the conductors is to be made, the length of the box shall NOT be less than ____times the trade
diameter of the largest conduit entering the box. - ANSWEREight
In guest rooms of hotels, motels, and sleeping rooms of dorms a MINIMUM of _____ general-
purpose receptacles installed in the room is/are required to be readily accessible. - ANSWERtwo
A listed _____ shall be installed in or on all emergency systems switchboards and panelboards. -
ANSWERsurge protective device (SPD)
Where a size 4 AWG or larger conductor enters a panelboard, which of the following must be
provided? - ANSWERAn insulated bushing.
,Class _____ locations are those that are hazardous because of the presence of easily ignitable fibers
or where materials producing combustible flyings are handled, but in which such fibers/flyings are
not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures. -
ANSWERIII
A single-phase, 240-volt, 15 kVA standby generator may be loaded to a MAXIMUM of _____ per line.
- ANSWER62.50 amperes
All motors shall be considered as _____ unless the nature of the apparatus it drives is such that the
motor will not operate continuously. - ANSWERcontinuous duty
Where the motor controller also serves as a disconnecting means, it shall open all _____ conductors
to the motor. - ANSWERungrounded
Before demand factors are taken into consideration for commercial buildings, general-purpose
receptacle loads are to be computed at NOT less than _____ per outlet. - ANSWER180 VA
Conductors with ______ insulation have a greater ampacity when used in a dry location compared to
when used in a wet location. - ANSWERTHHW
Isolating devices or equipment disconnecting means of solar photovoltaic systems shall be installed
in circuits connected to equipment at a location within the equipment, or within sight and within at
LEAST ______ of the equipment - ANSWER10 feet
A single-phase, 125-volt receptacle installed to serve a washing machine in the laundry room of a
dwelling unit must be installed within at LEAST ______ of the intended location of the appliance -
ANSWER6 feet
Conduit or tubing nipples not over 24 inches in length may be filled to a MAXIMUM of _____ of their
cross-sectional area. - ANSWER60 percent
Determine the MAXIMUM number of size 14 AWG THHN conductors permitted to be installed in a
trade size 3/8 in. flexible metal conduit (FMC) that contains a bare size 14 AWG grounding conductor,
when the FMC has external fittings. - ANSWERfour
, A device or group of devices that serves to govern, in some predetermined manner, the electric
power delivered to the apparatus to which it is connected to, is recognized as a _____ in the NEC. -
ANSWERcontroller
What is the MAXIMUM distance permitted between supports of straight runs of threaded trade size
2 in. rigid metal conduit (RMC)? - ANSWER16 feet
Which of the following listed types of storage batteries is NOT permitted for use as a source of power
for emergency systems? - ANSWERautomotive
A general-use snap switch with an ampere rating of NOT less than _____ shall be permitted as the
motor controller for a single-phase 2 hp, 240-volt motor. - ANSWER24 amperes
When ambient temperature is not a factor, a size 8 AWG single copper conductor with type FEPB
insulation, installed in free air, will have a MAXIMUM allowable ampacity of _____. - ANSWER80
amperes
For the purpose of determining conductor fill in a device box, a single-pole switch and/or a three-way
switch is counted as equal to _____ conductor(s), based on the largest conductor connected to the
switch. - ANSWERtwo
When determining the required ampacity of the branch-circuit conductors to supply a 3-phase,
continuous-duty ac motor, current values given on _____ shall be used. - ANSWERTable 430.250 of
the NEC
Three-way and four-way switches shall be wired so that all switching is done _____. - ANSWERonly in
the ungrounded circuit conductor
Determine the MAXIMUM number of size 1 AWG XHHW compact conductors permitted in a trade
size 3 in., rigid Schedule 40 PVC conduit more than 24 inches long. - ANSWER21
All 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed within at LEAST _____ of the
outside edge of a dwelling unit bathtub or shower stall require GFCI protection. - ANSWER6 feet
100% Correct!!
Electrical Generator works on the principle of: - ANSWERFlemings Right hand rule
Which of the following quantity is the same in a series electrical circuit: - ANSWERElectrical current
The transformer oil used in transformers acts as: - ANSWERBoth insulating material and coolant
Induction motor during no load condition will have a power factor in the range: - ANSWER0.2
The NEC states each building or other structure shall have only one disconnecting means unless
_____. - ANSWERThe multiple disconnecting means consists of no more than six, and are housed in
separate enclosures with a main service disconnecting means in each enclosure.
At buildings where communications systems are likely to be used, an intersystem bonding
termination shall be provided for the communications systems at an accessible location at the
service equipment. It shall be an aluminum or copper busbar not less than ¼ in. thick x 2 in. wide and
be of sufficient length to accommodate at LEAST _____ terminations for communications systems in
addition to other connections. - ANSWERThree
The ampacity of a conductor is defined by the NEC to be the maximum current, in amperes, a
conductor can carry continuously under the conditions of use without exceeding ______. -
ANSWERIt's temperature rating
A disconnect switch enclosure installed in a Class II, Division 2 location shall be listed as _____. -
ANSWERDustthight
The interior of enclosures or raceways installed underground shall be considered as a _____ location.
- ANSWERWet
Determine the ampacity (current-carrying capacity) of four (4) size 1/0 AWG THW copper current-
carrying conductors installed in a common raceway with an ambient temperature of 86 degrees F. -
ANSWER120 amperes
,The NEC defines a continuous load to be a load where the maximum current on the circuit is
expected to continue for at LEAST____ hours or more. - ANSWERThree
Given: You have determined a conductor has a computed ampacity of 75 amperes. What is the
MAXIMUM standard ampere rating of the overcurrent protection device the NEC permits to protect
this circuit where this is not a motor circuit or part of a multioutlet branch circuit supplying more
than one receptacle? - ANSWER80 amperes
A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty, ac motor has a full-load running current
rating of _____. - ANSWER143 amperes
Which of the following is permitted in the dedicated electrical space above an indoor installed 3-
phase, 480Y/277-volt panelboard? - ANSWERsprinkler protection
Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight (8) size
6 AWG copper conductors with THHW insulation, when installed in a 50 foot conduit run. -
ANSWER1¼ in.
Where exceptions are not applicable, when a feeder supplies a continuous load of 240 amperes, the
overcurrent protection device protecting this circuit shall have a rating of at LEAST _____. -
ANSWER300 amperes
Liquidtight flexible metal conduit (LFMC) shall be securely fastened WITHIN _____ of each box or
other conduit termination. - ANSWER12 inches
Where a pull box to be installed will contain conductors of size 4 AWG and larger, and a straight pull
of the conductors is to be made, the length of the box shall NOT be less than ____times the trade
diameter of the largest conduit entering the box. - ANSWEREight
In guest rooms of hotels, motels, and sleeping rooms of dorms a MINIMUM of _____ general-
purpose receptacles installed in the room is/are required to be readily accessible. - ANSWERtwo
A listed _____ shall be installed in or on all emergency systems switchboards and panelboards. -
ANSWERsurge protective device (SPD)
Where a size 4 AWG or larger conductor enters a panelboard, which of the following must be
provided? - ANSWERAn insulated bushing.
,Class _____ locations are those that are hazardous because of the presence of easily ignitable fibers
or where materials producing combustible flyings are handled, but in which such fibers/flyings are
not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures. -
ANSWERIII
A single-phase, 240-volt, 15 kVA standby generator may be loaded to a MAXIMUM of _____ per line.
- ANSWER62.50 amperes
All motors shall be considered as _____ unless the nature of the apparatus it drives is such that the
motor will not operate continuously. - ANSWERcontinuous duty
Where the motor controller also serves as a disconnecting means, it shall open all _____ conductors
to the motor. - ANSWERungrounded
Before demand factors are taken into consideration for commercial buildings, general-purpose
receptacle loads are to be computed at NOT less than _____ per outlet. - ANSWER180 VA
Conductors with ______ insulation have a greater ampacity when used in a dry location compared to
when used in a wet location. - ANSWERTHHW
Isolating devices or equipment disconnecting means of solar photovoltaic systems shall be installed
in circuits connected to equipment at a location within the equipment, or within sight and within at
LEAST ______ of the equipment - ANSWER10 feet
A single-phase, 125-volt receptacle installed to serve a washing machine in the laundry room of a
dwelling unit must be installed within at LEAST ______ of the intended location of the appliance -
ANSWER6 feet
Conduit or tubing nipples not over 24 inches in length may be filled to a MAXIMUM of _____ of their
cross-sectional area. - ANSWER60 percent
Determine the MAXIMUM number of size 14 AWG THHN conductors permitted to be installed in a
trade size 3/8 in. flexible metal conduit (FMC) that contains a bare size 14 AWG grounding conductor,
when the FMC has external fittings. - ANSWERfour
, A device or group of devices that serves to govern, in some predetermined manner, the electric
power delivered to the apparatus to which it is connected to, is recognized as a _____ in the NEC. -
ANSWERcontroller
What is the MAXIMUM distance permitted between supports of straight runs of threaded trade size
2 in. rigid metal conduit (RMC)? - ANSWER16 feet
Which of the following listed types of storage batteries is NOT permitted for use as a source of power
for emergency systems? - ANSWERautomotive
A general-use snap switch with an ampere rating of NOT less than _____ shall be permitted as the
motor controller for a single-phase 2 hp, 240-volt motor. - ANSWER24 amperes
When ambient temperature is not a factor, a size 8 AWG single copper conductor with type FEPB
insulation, installed in free air, will have a MAXIMUM allowable ampacity of _____. - ANSWER80
amperes
For the purpose of determining conductor fill in a device box, a single-pole switch and/or a three-way
switch is counted as equal to _____ conductor(s), based on the largest conductor connected to the
switch. - ANSWERtwo
When determining the required ampacity of the branch-circuit conductors to supply a 3-phase,
continuous-duty ac motor, current values given on _____ shall be used. - ANSWERTable 430.250 of
the NEC
Three-way and four-way switches shall be wired so that all switching is done _____. - ANSWERonly in
the ungrounded circuit conductor
Determine the MAXIMUM number of size 1 AWG XHHW compact conductors permitted in a trade
size 3 in., rigid Schedule 40 PVC conduit more than 24 inches long. - ANSWER21
All 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed within at LEAST _____ of the
outside edge of a dwelling unit bathtub or shower stall require GFCI protection. - ANSWER6 feet
