electrical Electrical - Conductors !

The square mil area of a conductor that is 0.250" on all sides is ___ square mils. a. 55,000 b. 62,500 c. 75,600 d. 80,200

62,500

All of the following are standard ratings for fuses except: a. 600A b. 601A c. 650A d. 700A

650A

The diameter (in inches) of a conductor with a diameter of 60 mils is a. 0.02" b. 0.04" c. 0.06" d. 0.08"

0.06"

What is the total resistance of a two-wire circuit that spans a distance of 200' each way, if the resistance per 1,000' is 1.21 V? a. 0.245V b. 0.266V c. 0.310V d. 0.484V

0.484V

What is the total resistance of a two-wire circuit that spans a total distance of 1,650 each way, if the conductor resistance is 0.148V per 1,000'? a, 0.3662V b. 0.484V c. 0.5342V d. 0.8764V

0.484V

Which of the following is the U. S. standard for measuring wires? a. NEMA b. NEC c. AWG d. ANSI

AWG

You would find Information on conductor applications and descriptions of insulation types in: a. NEC Table 310.15(B)(2)(a) b. NEC Table 310.13(A) c. NEC Table 310.16 d. NEC Chapter 9, Table 8

NEC Table 310.13(A)

Which of the following is not a consideration when determining the size of the conductor required to connect an electrical load to the source of supply? a. Number of strands b. Permissible voltage drop c. Total length of the conductor d. Type of wire

Number of strands

The constant (K) for the resistance of ordinary copper is____ per mil foot. a. 12.9 ohms b. 21.2 ohms c. 1.732 ohms d. 3.141 ohms

12.9 ohms

Which of the following conductors has the largest diameter? a. No. 1 AWG b. No. 12 AWG c. No. 3/0 AWG d. 250 kcmil

250 kcmil

The recommended maximum voltage drop for power, heating, and lighting loads is ______. a. 1% b. 2% c. 3% d. 4%

3%

To keep the voltage drop of a 120V circuit to a maximum of 3%, the maximum voltage drop allowed would be ? a. 3.6V b. 5.6V c. 6.2V d. 7.2V

3.6V

The recommended maximum voltage drop for conductors, feeders, and branch circuits combined is ____. a. 3% b. 5% c. 7% d. 9%

5%

Each of the following is a standard configuration for stranded wire except: a. 5-strand b. 7-strand c. 19-strand d. 37-strand

5-strand

To keep the voltage drop of a 240V circuit to a maximum of 3%, the maximum voltage drop allowed would b. a. 3V b. 5.4V c. 6.2V d. 7.2V

7.2V

The physical properties of a No. 4/0 copper conductor would be found in ____. a. NEC Table 310.16 b. NEC Chapter 9, Table 8 c. NEC Chapter 9, Table 1 d. NEC Table 310.13(A)

NEC Chapter 9, Table 8

Of the following, the largest standard AWG wire size is: a. No.3 AWG b. No.1 AWG c. No. 1/0 AWG d. No. 4/0 AWG

No. 4/0 AWG

What site wire is approximately double the cross- sectional area of No. 4 AWG? a. No.1 AWG b. No.16 AWG c. No.4 AWG d. No.2 AWG

No.1 AWG

All things considered, the most Ideal conductor is made of: a. bronze b. brass c. aluminum d. copper

copper

A continuous load as best described as one in which the maximum current is expected to continue for_____ hour(s) or more. a. one b. two c. three d. four

three

The normal location to provide overcurrent protection in an electrical circuit is ____. a. at the outlet b. where the conductor receives its supply c. where the conductor terminates d. at the last point in the circuit

where the conductor receives its supply

An acceptable method of identifying grounded conductors larger than No.6 AWG is marking them _____ or tagging them. a. white b. green c. black d. blue

white

A branch circuit is best described as: a. the circuit conductors between the service equipment and the final branch circuit overcurrent device b. the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s) c. a conductor tapped onto another conductor d. two conductors run in parallel

the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)

Use NEC Table 310.16 to find the maximum ampacity for a No.2 AWG copper wire at 90C (assume THHN insulation). a. 95A b. 110A c. 130A d. 150A

130A

The rating of a branch circuit Is determined by the: a. type and size of the branch circuit conductors b. rating of the branch circuit overcurrent device c. total connected load d. characteristics of the supply circuit

rating of the branch circuit overcurrent device