| 1. |
For dwelling unit with a 240/120 single-phase service the frame of a 4,500 watt 240/120 volt clothes dryer shall be grounded by using the grounding conductor. The minimum size copper conductor is:
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a)
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No. 10
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b)
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No. 8
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c)
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No. 12
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| 2. |
The minimum size copper equipment grounding conductor for a 200-ampere circuit is:
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a)
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No. 8
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b)
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No. 6
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c)
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No. 3
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| 3. |
When not under concrete, rigid metal conduit must be buried under public highways and streets at least:
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a)
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24 inches
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b)
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18 inches
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c)
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6 inches
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d)
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4 inches
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| 4. |
120-volt, 20-ampere GFCI protected residential branch circuit may be buried
at a minimum depth of :
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a)
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12 inches
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b)
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18 inches
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c)
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24 inches
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| 5. |
The listed ampacities of 75 Degrees C. conductors in a raceway must be reduced when the ambient air temperature exceeds:
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a)
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60 degrees C.
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b)
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75 degrees C.
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c)
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90 degrees C.
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d)
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30 degrees C.
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| 6. |
Horizontal nonmetallic wireways shall be supported where run horizontally
at intervals not to exceed _________, and at each end or joint, unless
listed for other support intervals. In no case shall the distance between
supports exceed 3 m (10 ft). |
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a)
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3 ft. |
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b)
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5 ft.
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c)
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6 ft. |
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| 7. |
When NOT using a one-shot bender, the minimum radius of a field bend
to the centerline of the conduit for 2-inch rigid metal conduit containing XHHW conductors is:
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a)
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9 1/2 inches
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b)
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12 inches
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c)
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15 inches
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| 8. |
In a straight run, 2-inch rigid metal conduit with threaded couplings may be supported at intervals not exceeding:
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a)
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10 feet
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b)
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12 feet
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c)
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16 feet
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| 9. |
The maximum size of electrical metallic tubing is:
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a)
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6-inch
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b)
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4-inch
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c)
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2-inch
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| 10. |
For metallic and nonmetallic, auxiliary gutters must not be filled to greater than:
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a)
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20 %
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b)
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30 %
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c)
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40 %
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d)
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60 %
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| 11. |
The multiplier for bending offsets is called the ________ of the angle used for the offset bends.
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a)
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sine
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b)
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cosine
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c)
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secant
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d)
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cosecant
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| 12. |
The largest conductor allowed in a standard box without other restrictions is:
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a)
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No. 4
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b)
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No. 8
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c)
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No. 6
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| 13. |
An Alternating-Current or Direct-Current General-Use Snap Switch may control what inductive load as a percentage of its ampere rating?
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a)
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80 %
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b)
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50 %
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c)
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75 %
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| 14. |
The ampacity of No. 14 fixture wire is:
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a)
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8 amperes
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b)
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15 amperes
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c)
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17 amperes
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| 15. |
When there are exposed live parts on both sides of the working space for a system operating at 480 volts
the required distance between the equipment is:
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a)
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3 feet
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b)
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3 1/2 feet
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c)
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4 feet
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| 16. |
Guarding by elevation for a 600-volt circuit requires an elevation of:
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a)
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8 feet
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b)
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6 1/4 feet
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c)
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8 1/2 feet
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| 17. |
Conduit or fittings must not rise into the bottom of a switchboard enclosure more than:
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a)
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8 inches
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b)
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3 inches
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c)
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10 inches
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| 18. |
Plug-in-type overcurrent protection devices that are backfed and used to
terminate field-installed ungrounded supply conductors ________________ . |
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a)
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are permitted if locked in place |
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b)
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shall be secured in place by an additional fastener that requires other than
a pull to release the device
from the mounting means on the panel.
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c)
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do not require any additional hardware |
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| 19. |
For a center line radius of 20 inches and a 45 degree bend the developed length of the conduit is found by using the following formula:
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a)
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dl = 20 x 90 x 0.0175.
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b)
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dl = 20 x 45 x 0.0175.
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c)
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dl = 20 x 90 x tangent of 45 degrees
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| 20. |
For a center line radius of 20 inches and a 90 degree bend the gain is:
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a)
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8.5 inches
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b)
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6 inches
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c)
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4.125 inches
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