Assignment: Conductors
1. Five No. 8 aluminum conductors with THHN insulation are to be routed through a conduit found in a boiler room with an ambient temperature of 75°C. The ampacity of each conductor is
A. 17.0 A.
B. 48.0 A.
C. 36.6 A.
D. 14.8 A.
2. When soldering a lug onto a copper wire, you would use
A. plain solder without flux.
B. acid-core solder only.
C. both plain solder and an acid.
D. rosin-core solder only.
3. A conductor that's described as a 750 MCM wire has an area of
A. 750 kcmils.
B. 750 in2.
C. 750,000 kcmils.
D. 750 cmils.
4. Ideally, NM or armored cable should be installed in a wall stud at least how far back from the front edge of the stud?
A. 3/4 in.
B. 1½ in.
C. 1 in.
D. 1¼ in.
5. What size copper wire should be used for a 125 ft, 15 A branch circuit if a maximum voltage drop of 3.2 V is allowed?
A. No. 8
B. No. 10
C. No. 12
D. No. 14
6. A single No. 10 copper wire with type THW insulation that's used in free air with an ambient temperature of 158°F has an approximate ampacity of
A. 36.9 A.
B. 16.5 A.
C. 31.9 A.
D. 40.0 A.
7. Ampacity, or the maximum flow of electricity for a time period,
A. isn't dependent on wire diameter or number.
B. increases as wire diameter increases.
C. increases as wire number increases.
D. decreases as wire number decreases.
8. Which one of the following types of wire can be used with the pressure terminals of a duplex receptacle?
A. Stranded copper
B. Stranded aluminum
C. Solid copper
D. Solid aluminum
9. If a cable insulation is described as RHW, you would be able to use the cable for what maximum temperature?
A. 167°F
B. 194°F
C. 86°F
D. 140°F
10. The most widely used insulator for splices of smaller wires, like those used for devices, is
A. friction tape.
B. a wire nut.
C. solder.
D. a split bolt.
11. A nonshielded cable with a 1.5-inch diameter should have a minimum bending radius of
A. 1.5 in.
B. 18.0 in.
C. 12.0 in.
D. 6.0 in.
12. The calculation used to determine amperage of a conductor based on the total number of conductors in a conduit is called
A. conduit fill.
B. voltage drop.
C. derating.
D. conductor fill.
13. What is the ampacity of a No. 3/0, THHN copper wire, in a conduit with one other conductor?
A. 175 A
B. 225 A
C. 200 A
D. 350 A
14. A type TW cable containing two No. 12 copper conductors has a maximum overcurrent protection of
A. 20 A.
B. 15 A.
C. 30 A.
D. 25 A.
15. The ampacity of a No. 12 aluminum wire with RHW insulation installed in a raceway that has 19 other wires is
A. 7 A.
B. 10 A.
C. 5 A.
D. 15 A.
16. An electric iron is plugged into a receptacle that has 110 V present. If the voltage loss from the panel to the receptacle is 6 V, the line voltage at the panel is
A. 116 V.
B. 110 V.
C. 120 V.
D. 104 V.
17. A conductor with a diameter of 100 mils has an area of
A. 0.00785 in2.
B. 0.01 cmil.
C. 100 in2.
D. 100 kcmil.
18. The diameter of a No. 6 wire is larger than a
A. No. 4 wire.
B. No. 2/0 wire.
C. 250 kcmil cable.
D. No. 12 wire.
19. The ease with which a material allows electricity to move is called
A. ampacity.
B. voltage.
C. conductivity.
D. potential.
20. Which type of tape is used to round sharp edges on splices using larger conductors?
A. Plastic tape
B. Rubber tape
C. Cotton tape
D. Friction tape.