JATC 1ST Year Final Exam Rated A+
? are devices that interrupt the flow of electricity within as little as 1/40 of a second to
prevent electrocution. - ANSWER-Ground-fault circuit interrupters
? associated with the flow of current in a conductor is one of the most significant factors
to be considered in designing electrical systems. The conductor's rating is dependent
upon its type of ? . - ANSWER-Heat / electrical insulation
? is a keen sense of what to do or say in order to maintain good relations with others or
avoid offense. - ANSWER-tact
A "plumb 30" or a "plumb 45" bender will reliably produce an approximate 30°- or 45°-
bend when the conduit is horizontal and the handle is pulled up so that the handle is
vertical or plumb. - ANSWER-True
Note: There are too many variables to rely solely upon the position of the bender handle
to determine the angle of bend. Each bender should be checked initially to verify the
accuracy of the bender markings and the take-up value.
A back-to-back 90° bend has been fabricated in 3/4 " EMT to connect a junction box
and a disconnect switch. The tops of both enclosures are at the same height. In laying
out this bend, it is necessary to determine the distance between the connector on the
box and the connector on the switch. The right side of the conduit connector (junction
box) will be used to make the measurement. - ANSWER-False
Note: The mark will be on the left side of the connector at the point where the back of
the bend goes into the connector; "back-to-back" measurements are taken to the
outside of the bends, not the inside.
A cable assembly that enters a fire resistive wall and exits the opposite side of the wall
is considered to be a ? penetration. - ANSWER-through
A coating of joint compound on the surface of a conductor, prevents a(n) ? from
reforming after the installation process. - ANSWER-oxide
A competent electrician is one who has ___ , __ , and a positive ___ for his or her trade.
- ANSWER-skill / knowledge / attitude
A four-bend saddle uses standard offset multipliers. - ANSWER-True
A Journeyman is told to run a three-inch conduit across a room and decides to use a
channel-iron system. The apprentice suggests that one-hole straps might be quicker.
What might happen? - ANSWER-The Journeyman should explain the reasoning behind
, his or her decision. The apprentice should respect the Journeyman's experience and
should defer to the Journeyman.
A ladder top should extend at least ? above the roof edge of a building when used as
access to the roof of a building. - ANSWER-36"
A lightweight metallic raceway without threads is called ? in the National Electrical
Code. - ANSWER-Electrical Metallic Tubing
A three-bend saddle will typically use a shrink constant of 3/16 inch. - ANSWER-True
A(n) ? GFCI requires the amount of current leaving the source and returning to the
source to be within 5 mA of each other. - ANSWER-Class A
According to NEC Section ? , ? shall not be threaded. - ANSWER-358.28(B) / EMT
Because the surface of aluminum conductors oxidizes readily, terminations are
generally made with the aid of ? designed to prevent the oxide from re-forming in the
installation process. - ANSWER-joint components
Before getting down from a scaffold, you should always check to be sure that materials
or tools ? . - ANSWER-are not left in a position from which they might fall if the scaffold
is moved
Burns are the most common shock-related injury. An electrical accident can result in an
electrical burn, arc burn, thermal contact burn, or a combination of burns. - ANSWER-
True
Calculate the distance to the reference mark for a 12 3/4-inch stub-up length and match
it to the conduit size. - ANSWER-1/2 " → 7 3/4"
3/4" → 6 3/4"
1" → 4 3/4"
1 1/4" → N/A
Choose the value that most closely equals the stub-up length needed for the 1/2-inch
EMT in the photo. Keep in mind that if the measurement is being taken to the side of the
box, instead of the inside of the connector, it will be necessary to subtract a slight
amount (1/16 to1/8 inch) to compensate for the ridge at the bottom of the connector. A
temporarily inserted conduit has been installed for a measurement. - ANSWER-Even
though it appears that the actual value required is 17 15/16", it is best to shorten the
measurement slightly to compensate for the fact that the connector will not allow the
end of the conduit to be inserted even with the side of the box.
The correct answer is: 17 7/8"
? are devices that interrupt the flow of electricity within as little as 1/40 of a second to
prevent electrocution. - ANSWER-Ground-fault circuit interrupters
? associated with the flow of current in a conductor is one of the most significant factors
to be considered in designing electrical systems. The conductor's rating is dependent
upon its type of ? . - ANSWER-Heat / electrical insulation
? is a keen sense of what to do or say in order to maintain good relations with others or
avoid offense. - ANSWER-tact
A "plumb 30" or a "plumb 45" bender will reliably produce an approximate 30°- or 45°-
bend when the conduit is horizontal and the handle is pulled up so that the handle is
vertical or plumb. - ANSWER-True
Note: There are too many variables to rely solely upon the position of the bender handle
to determine the angle of bend. Each bender should be checked initially to verify the
accuracy of the bender markings and the take-up value.
A back-to-back 90° bend has been fabricated in 3/4 " EMT to connect a junction box
and a disconnect switch. The tops of both enclosures are at the same height. In laying
out this bend, it is necessary to determine the distance between the connector on the
box and the connector on the switch. The right side of the conduit connector (junction
box) will be used to make the measurement. - ANSWER-False
Note: The mark will be on the left side of the connector at the point where the back of
the bend goes into the connector; "back-to-back" measurements are taken to the
outside of the bends, not the inside.
A cable assembly that enters a fire resistive wall and exits the opposite side of the wall
is considered to be a ? penetration. - ANSWER-through
A coating of joint compound on the surface of a conductor, prevents a(n) ? from
reforming after the installation process. - ANSWER-oxide
A competent electrician is one who has ___ , __ , and a positive ___ for his or her trade.
- ANSWER-skill / knowledge / attitude
A four-bend saddle uses standard offset multipliers. - ANSWER-True
A Journeyman is told to run a three-inch conduit across a room and decides to use a
channel-iron system. The apprentice suggests that one-hole straps might be quicker.
What might happen? - ANSWER-The Journeyman should explain the reasoning behind
, his or her decision. The apprentice should respect the Journeyman's experience and
should defer to the Journeyman.
A ladder top should extend at least ? above the roof edge of a building when used as
access to the roof of a building. - ANSWER-36"
A lightweight metallic raceway without threads is called ? in the National Electrical
Code. - ANSWER-Electrical Metallic Tubing
A three-bend saddle will typically use a shrink constant of 3/16 inch. - ANSWER-True
A(n) ? GFCI requires the amount of current leaving the source and returning to the
source to be within 5 mA of each other. - ANSWER-Class A
According to NEC Section ? , ? shall not be threaded. - ANSWER-358.28(B) / EMT
Because the surface of aluminum conductors oxidizes readily, terminations are
generally made with the aid of ? designed to prevent the oxide from re-forming in the
installation process. - ANSWER-joint components
Before getting down from a scaffold, you should always check to be sure that materials
or tools ? . - ANSWER-are not left in a position from which they might fall if the scaffold
is moved
Burns are the most common shock-related injury. An electrical accident can result in an
electrical burn, arc burn, thermal contact burn, or a combination of burns. - ANSWER-
True
Calculate the distance to the reference mark for a 12 3/4-inch stub-up length and match
it to the conduit size. - ANSWER-1/2 " → 7 3/4"
3/4" → 6 3/4"
1" → 4 3/4"
1 1/4" → N/A
Choose the value that most closely equals the stub-up length needed for the 1/2-inch
EMT in the photo. Keep in mind that if the measurement is being taken to the side of the
box, instead of the inside of the connector, it will be necessary to subtract a slight
amount (1/16 to1/8 inch) to compensate for the ridge at the bottom of the connector. A
temporarily inserted conduit has been installed for a measurement. - ANSWER-Even
though it appears that the actual value required is 17 15/16", it is best to shorten the
measurement slightly to compensate for the fact that the connector will not allow the
end of the conduit to be inserted even with the side of the box.
The correct answer is: 17 7/8"
