THESE QUESTIONS ARE ELECTRICIAN REALATED

Conductors

1. The calculation used to determine amperage of a conductor based on the total number of conductors in a conduit is called A. derating. B. conduit fill. C. voltage drop. D. conductor fill.

2. A conductor with a diameter of 100 mils has an area of A. 100 in2. B. 0.00785 in2. C. 0.01 cmil. D. 100 kcmil.

3. 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. 12 B. No. 14 C. No. 10 D. No. 8

4. 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. 140°F D. 86°F

5. The most widely used insulator for splices of smaller wires, like those used for devices, is A. a split bolt. B. solder. C. friction tape. D. a wire nut.

6. The ease with which a material allows electricity to move is called A. voltage. B. potential. C. conductivity. D. ampacity.

7. Which one of the following types of wire can be used with the pressure terminals of a duplex receptacle? A. Stranded aluminum B. Stranded copper C. Solid aluminum D. Solid copper

8. What is the ampacity of a No. 3/0, THHN copper wire, in a conduit with one other conductor? A. 350 A B. 200 A C. 175 A D. 225 A

9. 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. 15 A. C. 5 A. D. 10 A.

10. 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. 16.5 A. B. 36.9 A. C. 40.0 A. D. 31.9 A.

11. 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. 120 V. C. 104 V. D. 110 V.

12. 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. 11/4 in. C. 11/2 in. D. 1 in.

13. When soldering a lug onto a copper wire, you would use A. plain solder without flux. B. acid-core solder only. C. rosin-core solder only. D. both plain solder and an acid.

14. The diameter of a No. 6 wire is larger than a A. No. 2/0 wire. B. 250 kcmil cable. C. No. 4 wire. D. No. 12 wire.

15. A nonshielded cable with a 1.5-inch diameter should have a minimum bending radius of A. 12.0 in. B. 6.0 in. C. 18.0 in. D. 1.5 in.

16. 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. 48.0 A. B. 36.6 A. C. 17.0 A. D. 14.8 A.

17. A type TW cable containing two No. 12 copper conductors has a maximum overcurrent protection of A. 25 A. B. 15 A. C. 20 A. D. 30 A.

18. A conductor that's described as a 750 MCM wire has an area of A. 750 cmils. B. 750,000 kcmils. C. 750 kcmils. D. 750 in2.

19. Which type of tape is used to round sharp edges on splices using larger conductors? End of exam A. Cotton tape B. Friction tape C. Plastic tape D. Rubber tape

20. Ampacity, or the maximum flow of electricity for a time period, A. decreases as wire number decreases. B. increases as wire diameter increases. C. increases as wire number increases. D. isn't dependent on wire diameter or number.

POINTS ONLY FOR CORRECT ANSWERS

It is a technique typically engaged in electrical power and electronic devices, wherein the devices are run at less than their rated maximum power degeneracy, taking into account the case or body temperature, the ambient temperature and the type of cooling mechanism used.

2. B.

In order to answer the question, you need to know the area of a circle.
Area = pi * r^2
Area = 3.14 * (100/2) ^ 2
Area = 3.14 * 50^2
Area = 7850 mils^2 = 0.00785 in^2

3. A.

V / 15 A = 0.213 Ohm
0.213 Ohm / 125 ft * 1000 ft = 1.71 Ohm / 1000 ft
Closest gauge is #12 AWG (solid wire)
#12 is 1.588 Ohm / ft, which is a 2.9775 V drop @ 15A

4. A.

RHW cale insulation can be used up to 167 degrees F.

5. D.

This is a type of electrical connector used to fasten two or more low-voltage (or extra-low-voltage) electrical conductors.

6. C. the ease with which a material allows electricity to move is called CONDUCTIVITY

7. D.

Stranded conductors are not acceptable in the pressure terminals of a duplex receptacle. Aluminum conductors of suitable gauge for a 15 ampere duplex outlet will not fit in the pressure terminal holes.

8. D.

A 3/0 AWG THHN insulated Copper is rated at 225 amps and it falls under the 90 degree C table.

9. D.

A #12 copper conductor with an insulation factor of 90 degrees C is rated at 20 amps. A #12 aluminum conductor with an insulation rating of 90 degrees C is rated at 15 amps. These conductors ratings only applies to three conductors in a rated at 15 amps. These conductors’ ratings only applies to three conductors in a raceway. From 7 to 24 conductors in a raceway, both aluminum and copper conductor's ratings have to be reduced by .70, so 15 amps x .7 = 10.5 amps and 20 amps x .7 = 14 amps respectively.

10. A.

NEC 310.15(B)(1) and (2), table 310.15(B)(2)(a), and table 310.15(B)(17).
Convert 158°F to C result is 70°C. 50 amps x .33 correction factor = 16.5 amps

11. A.

12. B.

Ideally, nm or armored cable should be installed in a wall stud at least 1 1/4 inches from the front edge of the stud.

13. C.

Always use flux for electrical connections and never use acid flux on electrical connections

14. D.

In wire gauge, the lower the number, the larger the diameter. So a 6 gauge is larger than 12 gauge, but smaller than 4 gauge.

15. A.

16. D.

17. C.

Table 310-16 NEC

18. A
MCM means 1000's (M) of (C)ircular (M)ils

19. D.

Rubber tape is used to round sharp edges

20. B.

The larger the diameter, the larger the ampacity, or the ability to carry current.