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2011 NEC Review PracticeTest 2

Course Name: 2011 NEC Review
Quiz Number:  No. 2
Teacher: Gerald Newton
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No. of Questions= 20

1 In the diagram below the total resistance is _____ and the value of R3 is ____.


a) 20, 10.7 ohms

b) 20, 19.7 ohms

c) 20, 20.7 ohms

d) 10, 30 ohms

2 What is the ampacity of 12 No. 12 THHN copper conductors in a 10 feet long EMT raceway where there are 9 current carrying conductors and the ambient temperature is 42 degree C? (Select nearest answer)


a) 10 amperes

b) 15 amperes

c) 18 amperes

d) 22 amperes

3 What is the allowable ampacity of each No. 6 THW copper conductor if there are 10 current carrying conductors in a 24 inch long rigid conduit nipple in a room where the ambient temperature is 55 degrees C? (Select nearest answer)


a) 65 amperes

b) 67 amperes

c) 50 amperes

d) 44 amperes

4 Find the size EMT nipple required to enclose 3 each 500 kcmil THHN conductors between two panels.


a) 1 1/2 inch

b) 2 inch

c) 3 inch

d) 3 1/2 inch

5 What size rigid steel conduit is required for 4 each 4/0 XHHW and 1 each No. 3 bare equipment grounding conductor if the raceway is 12 feet long?


a) 1 1/2 inch

b) 2 inch

c) 2 1/2 inch

d) 3 inch

e) 1 inch

6 Junction boxes shall be ______.


a) accessible

b) readily accessible

c) visible

d) inside removable panels

7 The type of lampholder required in a branch circuit in excess of 20 amperes shall be ______.


a) brass

b) porcelain coated

c) not an interchangeable type

d) heavy duty

8 Unless an excepted load as specified by the Code, a conductor rated 56 amperes shall be protected by a _____ fuse.


a) 50

b) 60

c) 70

d) 80

9 In a washdown area a metallic raceway shall be spaced not less than _____ inch from the walls.


a) 1/8

b) 1/4

c) 1/2

d) 3/4

10 Given: Three (3) 500 kcmil Type THHN copper conductors in a raceway at 70 degrees C. The maximum allowable current in each conductor is _____ amperes.


a) 249

b) 409

c) 430

d) 705

11 A luminaire (fixture) that weighs more than _______ lb or exceeds 400 mm (16 in.) in any dimension shall not be supported by the screw shell of a lampholder.


a) 4

b) 6

c) 50

d) 70

12 An AC-DC general use snap switch may be used with inductive loads at _____ percent of its ampere rating at the applied voltage.


a) 40

b) 50

c) 70

d) 80

13 When utilized as outside branch circuits and feeders, overhead conductors for 600 volts or less, for spans up to 50 feet, shall not be less than _____ copper.


a) No. 14

b) No. 12

c) No. 10

d) No. 8

14 Conductors of light and power systems of 600 volts or less may occupy the same enclosure, without regard to whether the individual circuits are AC or DC, only where all the conductors are ________.


a) insulated for the maximum temperature within the enclosure.

b) insulated for the maximum voltage applied to any conductor within the enclosure

c) insulated for the maximum of 300 volts

d) none of the above

15 When utilized in overhead services, without any exceptions, conductors shall not be smaller than No. ______ copper.


a) 14

b) 12

c) 10

d) 8

16 Made electrodes shall have a resistance to ground not to exceed ______ ohms when used alone.


a) 5

b) 10

c) 25

d) 30

17 Disregarding all exceptions, the sum of the cross-sectional area of all conductors in a metal wireway shall not exceed ______ percent of the interior cross-sectional area of the wireway.


a) 20

b) 30

c) 40

d) 60

18 Given: Nine (9) No. 8 AWG THHN copper conductors in a conduit at 30 degrees C. What is the maximum allowable ampacity in each conductor?


a) 33.3

b) 38.5

c) 40.0

d) 55

19 The minimum total circuit ampacity required to supply an air conditioning motor compressor unit which consumes 8,500 volt amperes of power at a line voltage of 240 volts is ______ amperes. Select the closest answer.


a) 44.3

b) 40.0

c) 35.4

d) 28.3

20 Given: An office building has a required general lighting load of 50,000 volt amperes. The general lighting load is supplied by a single phase, 230 volt feeder circuit. The minimum calculated current in the feeder circuit ungrounded (hot) conductors is _____ amperes. Select the closest answer.


a) 208

b) 217

c) 227

d) 230

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© 2008 Gerald Newton