Chapter 8 Interior Wiring and Lighting

Transcription

1 Chapter 8 Interior Wiring and Lighting Review Questions 1. What tool if any, is used to remove a fuse that is to be replaced? 1. Pliers 2. Screwdriver 3. Fuse puller 4. None 2. OSHA has established specific color codes to designate certain cautions and dangers. What color is a caution for marking physical hazards? 1. Red 2. Yellow 3. Orange 4. Green 3. What class of fire occurs in wood, clothing, paper, rubbish, and other such items? 1. Class A 2. Class B 3. Class C 4. Class D 4. What class of fire occurs in electrical equipment and facilities? 1. Class A 2. Class B 3. Class C 4. Class D 5. Obtain permission from what individual prior to installation or maintenance of energized circuits? 1. Division Officer 2. Division Chief 3. Site Supervisor 4. Commanding Officer 6. What chapter of the NEC contains tables and examples? 1. Three 2. Five 3. Seven 4. Nine

2 7. What is the starting point for interior wiring? 1. Service entrance 2. Bus bar 3. Fuse panel 4. Circuit board 8. What material is usually used to make rigid metal conduit? 1. Lead 2. Copper 3. Steel (ferrous) 4. Brass 9. What size wire is most frequently used for interior wiring as a solid or stranded copper conductor? 1. Number 12 AWG 2. Number 14 AWG 3. Number 16 AWG 4. Number 18 AWG 10. When making the decision on what box to mount in each location what considerations must be made prior to choosing the box? 1. Size of room 2. Number of occupants 3. Number and size of conductor s box will contain 4. Size of conductors only 11. What tool is marked by many electricians as a guide to indicate the proper height for installing outlet boxes? 1. Screwdriver 2. Hammer handle 3. Monkey wrench 4. Pipe wrench 12. When a room is to be lit with a row of lights, they will be installed at what location in the room? 1. Along the center line 2. Along the entrance-side wall 3. Along the opposite was from entrance 4. At each end of the room 13. (True or False) An electrical system installed in concrete or in direct contact with the earth is considered to be a system below grade.

3 14. (True or False)The recognized wiring methods of the NEC do not allow use of type UF cable for interior wiring in wet, dry, or corrosive locations. 15. (True or False) Ungrounded conductors are available only as multi-conductor cables. 16. Most construction blueprints and specifications will not show what information needed for installation of a circuit? 1. Direction of the conduit run 2. Distribution panel to be used 3. Location of apparatus 4. Number of boxes per circuit 17. Conductors of more than 600 volts on a power should not occupy the same enclosure as conductors carrying less than how many volts? volts volts volts volts 18. A lighting and appliance branch circuit panelboard is limited to not over how many overcurrent devices (excluding the main overcurrent devices) in any one cabinet or cutout box? How much overcurrent protection must panelboards equipped with snap switches rated at 30 amperes or less have? 1. Not in excess of 200 amperes 2. Not in excess of 250 amperes 3. Not in excess of 300 amperes 4. Not in excess of 400 amperes 20. The total load on any overcurrent device located in a panelboard will not exceed what percent of its rating? percent percent percent percent

4 21. With the exception of fluorescent lighting, lighting branch circuits may carry loads as high as the maximum of how many amperes? amperes amperes amperes amperes 22. Once you begin the finish work, what is the first thing you need to do? 1. Turn on power to circuits 2. Install all switches 3. Install all outlets 4. Make all ground connections 23. Which answer below contains all the switches used for interior wiring? 1. Single-pole, three-way, four-way toggle switches 2. Three-way, four-way toggle, five-blade toggle 3. Single-pole and three-way only 4. Single-pole and four-way toggle only 24. What is the term for removing sharp edges or burrs on the inside of conduit after it has been cut? 1. Scraping 2. Reaming 3. Cleaning 4. Brushing 25. Most field bends are done with manual benders. What are the two types of manual benders? 1. One-shot and Hixon benders 2. One-shot and Hickey benders 3. Hickey and Hixon benders 4. Upright and One-shot benders 26. When installing rigid nonmetallic conduit, factory elbows are available in what degree bends? 1. 20, 22, and 24 degree 2. 26, 28, and 32 degree 3. 30, 45, and 90 degree 4. 35, 40, and 80 degree

5 27. When making a 90 degree bend, by what term is the distance from the end of the conduit to the back of the 90 known to electricians? 1. End of bend 2. Stub-up 3. Snub-up 4. Take-up 28. What is the definition of an offset bend? 1. Two equal bends in opposite directions 2. Two equal bends in same direction 3. One bend same direction as fixture 4. One bend opposite direction from fixture 29. What is the most common method of straddling an object with conduit? degree center bend degree offset bend 3. Three-bend saddle 4. Two-bend saddle 30. (True or False) Power benders are used for bending only small sizes of conduit? 31. (True or False) Some mechanical benders have an electrical power pump that is used to apply pressure on the ram. 32. (True or False) All raceways must be installed as a complete system before any conductors are pulled into them. 33. (True or False) Rigid metal conduit must be supported within 6 feet of a box. 34. (True or False) For short conduit runs with only two wires, the conductors can be pushed through the conduit from one box to the next.

6 35. What is the maximum number of right angle bends in conduit between outlets or fittings? 1. Two 2. Three 3. Four 4. Five 36. Fuse panels are not to be installed either for new work or as a replacement panel unless they have been modified to accept what type fuse? 1. Type J 2. Type S 3. Type T 4. Type Z 37. The NEC requires all but, which one of the following locations within a home to have ground fault circuit interrupter (GFCI) circuit breakers installed? 1. Bedrooms with no 15 or 20 ampere receptacles 2. Bathrooms with 15 and 20 ampere receptacles 3. Garages with 15 and 20 ampere receptacles 4. Outdoor patio with 15 and 20 ampere receptacles 38. (True or False) Some models of clamp on ammeter allow electricians to measure the amount of current on an energized circuit without having to open the circuit first and connect test leads. 39. (True or False) The fastest method of determining resistance is by taking a resistance reading directly from a clamp-on-ammeter. 40. (True or False) An open circuit is an incomplete circuit. 41. What is the most common test made with a neon tester? 1. Testing if a circuit breaker is good or bad 2. Checking for circuit resistance 3. Checking circuit voltage 4. Checking for power to a receptacle

7 42. What is the first step prior to testing for a defective switch? 1. Make sure the power to suspected switch has been turned OFF 2. Make sure the power to suspected switch has been turned ON 3. Make sure the suspected switch is correct size for circuit 4. Make sure there are no other switches on same circuit 43. All but which of the following are types of grounds or short circuits? 1. Fluctuating 2. Solid 3. Partial 4. Floating 44. What type of device or splice has almost completely eliminated soldering and taping for certain connections? 1. Pigtail splice 2. T-tap splice 3. Western Union splice 4. Wire nuts 45. What type of splice is used when the connection must be strong enough to support long lengths of heavy wire? 1. Pigtail splice 2. Western Union splice 3. T-tap splice 4. Portable cord splice 46. (True or False) Once the decision is made to solder an electrical splice and the insulation has been stripped of the wire, the splice should be soldered as soon as possible due to possible oxidation. 47. (True or False) Using either a soldering iron, soldering gun, or propane torch the solder should be applied to the same side of the splice as the heat. 48. (True or False) When plastic (vinyl) tape is used for insulation protection for a splice it should be stretched as it is applied.

8 49. (True or False) Mercury lamps have the best maintained light output because the electrodes operate at a relatively cool temperature. 50. How many types of prefabricated scaffolding are there? 1. One 2. Two 3. Three 4. Four 51. What are the maximum pounds per square foot that heavy duty scaffolding should handle? pounds pounds pounds pounds