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3E051 Set C Book 4
| Question | Answer |
|---|---|
| Which listed measurement determines the length of a screwdriver? | Length of the shank |
| The most versatile vise an electrician uses is the | utility vise |
| Which tool cuts holes and grooves in lumber? | wood chisel |
| Which bit drills holes in wood and metal? | twist bit |
| On what type of conduit do you use a reamer? | Rigid metal conduit |
| The spade bit we sometimes refer to as a | speed bit |
| What tool do you use to cut openings in finished walls | saber saw |
| What is the largest AWG size electrical wire? | 4/0 |
| The thousand circular mills (kcmil) size range for conductors is | 250 to 2,000 |
| What do the letters THW marked on an electrical conductor indicate? | Heat and moisture resistant thermoplastic |
| What is the procedure we use to connect boxes together to permit more than one device to be mounted with a single cover plate? | Ganging |
| What is the purpose of a raised box cover? | provides added interior space as well as a cover for the box |
| Which condition below is not allowed? | using flexible metal tubing in lengths greater then 6 feet |
| Which ratings are always found on switches? | amperes and volts |
| What is the maximum distance from a floor or a working platform that you can install switch and circuit breaker handles? | 79 inches |
| What ratings are found on receptacles? | volts and amperes |
| Which classification of light directs from 40 to 60 percent of its light upward above the area to be lighted? | general diffusing |
| Which classification of light fixtures directs all its light so that the entire ceiling and upper side walls become the light source? | indirect |
| Incandescent lamps have efficiencies ranging from | 6 to 24 lumens per watt |
| What is the diameter of a T8 lamp? | 8/8 inch |
| How many electrical contacts do Instant Start lamps require? | two |
| What frequency should you expect to find in electronic ballasts used in fluorescent lighting systems? | 25,000 to 40,000 Hz |
| What is the disadvantage of high intensity discharge lamps? | re-strike time |
| Which characteristic is associated witha a mercury vapor lamp near the end of its useful life? | Reduced light output |
| The efficiency range of a lamp is measured in lumens per | watt |
| What color light is associated with sodium lamps? | golden |
| What significant hazard is associated with the low-pressure sodium lamp? | Explosive reaction if sodium comes in contact with water. |
| How many conductors are required for a 3-phase-wye service enterance used for power and lighting? | 3 ungrounded and one grounded neutral conductors |
| which one of these voltage systems has one phase to neutral voltage that is higher than other phases to neutral? | 4 wire, 3-phase delta |
| The purpose of a transformer core is to | provide a magnetic path |
| The transformer loss caused by demagnitizing and remagnetizing of the core is | hystersis |
| The insulation value of transformer coils, bushings, and oil determines | the voltage rating of the transformer |
| To provide 120/240 single-phase voltage to the user, the secondary transformer windings | are connected in series |
| Only one voltage exists in a delta system, and it is a | 3-phase, 3-wire configuration |
| When you make a delta-delta connection for lights and power, there is one unusable voltage from | A phase to neutral |
| One important function of the fuse link enclosure is to | help contain the arc that accompanies a blown fuse |
| With the enclosed type of fused cutout, you put the fuse into the circuit by | closing the cutout door |
| What is the minimum clearance for a service drop over a public street? | 18 feet |
| Power operated service disconnects are required to be designed so that they can be opened | manually |
| Why are service enterance conductors usually larger than the service drop conductors? | Free air permits greater amperage on service drop conductors |
| Where do you place the weatherhead in reference to the point of attachment of the service drop conductors? | higher |
| Two ways to keep from entering service enterance (SE) cable are to use a weatherhead or | a gooseneck |
| An undergraound distribution system we refer to as a service | lateral |
| Underground services installed with cable must be buried to a depth of at least | 24 inches |
| In a panel with a neutral, what is the smallest percentage of the overcurrent devices that must be rated at 30 amperes of less for it to be classed as a lighting and appliance panel? | 10 percent |
| Fuse panels are designed for plug fuses, cartridge fuses, or | knife-blade fuses |
| When istalling a panelboard in a damp location, what is the minimum distance you must place the cabinet from the wall? | 1/4 inch |
| The equipment ground bar and neutral bar are bonded together in a panel only when the panelboard also serves as the | service entrance equipment |
| The conductors between the final overcurrent devices and the outlet for connecting electrical equipment we call | branch circuit conductors |
| A feeder is made up of the wires | to a sub-panel |
| What is the cycles per second (Hertz) rating for most electrical equipment found in foreign countries? | 50 |
| In Europe the most common voltages are | 220-380 |
| Which part of a set of blueprints indicates the route of the service entrance? | plot plan |
| Which electrical diagram does not show the relative position of the parts of the system? | schematic diagram |
| Floor plans of a blueprint do not show | wiring connections |
| The normal color code for wiring a device is | black to gold terminal, white to silver |
| What is the general lighting load of an office building with 1,600 square feet of living area? | 5,600 Watts |
| What factor considers that not all lights and receptacles are to be used at the same time? | demand factor |
| What is the total wattage of 9 ballasts rated at 1.5 amps each and fed by 277 volts? | 3,739 Watts |
| Heavy-duty lamp-holder outlets are calculated at | 600 volt-amperes |
| What is the required wattage for lighting of an industrial commercial (loft) building measuring 60 by 100 feet? | 12,000 watts |
| The code letter on a motor data plate identifies | the locked-rotor current draw of the motor |
| Ampere capacity of branch-circuit conductors feeding a continuous duty rated motor must be not less than | 125 percent of the motor's FLC |
| To determine the total calculated load of a sub-panel, add all the amperes of the branch circuits plus what percent of the amperage of the largest motor? | 25 percent |
| How many current carrying conductors can be installed in raceway before the current capacity of the conductors must be derated? | 3 |
| What is the volume of space needed in cubic inches for No. 12 conductor? | 2.25 cubic inches |
| A quick, easy method of mounting boxes to metal studs is to use | spring metal clips |
| What is the most popular height for receptacle outlet boxes in the living areas of a house from the floorline to the center of the box? | 12 inches |
| Nonmetallic cable with aluminum conductors ranges in size from | No. 12 to No. 2 AWG |
| Nonmetallic corrosion resistant cable, but not metallic sheathed cable, more commonly called nonmetallic cable, can be used | in corrosive locations |
| Nonmetallic corrosion resistant cable No.8 AWG, or larger, may be held in place by EMT straps | on smooth walls where the cable is exposed |
| One layer of plastic tape can insulate against a voltage of | 600 volts |
| In addition to the splices required, you must make grounding connections to the boxes used in a circuit to ensure that they are | grounded |
| The maximum weight of a fixture that can be supported by an outlet box is | 50 pounds |
| What is the taper per foot required for a standard conduit-cutting die used on rigid metal conduit? | 3/4 inch |
| Two adjacent 90 degree bends in the same piece of conduit make up a | back-to-back bend |
| When a number of conduit runs are to be installed parallel and adjacent to each other, install the | conduit all at the same time |
| Which tool makes a good handle for pulling a fish tape? | side cutting pliers |
| The number of conductors you can put in conduit is based on the | size of the conduit, conductor size, and conductor insulation |
| Which material do you use for a circuit extension when appearance is an important factor? | surface raceway |
| Heat created by loose connections cause | an increase in amperage |
| Grounds or short circuits can be | solid, partial and floating |
| The basic factor to consider in choosing continuity testing equipment is to use | low-voltage instruments to reduce the danger of sparking. |
| When you are checking a 3-phase panel with a voltmeter which phase indicated a "blown" fuse to you? Use these readings: A-B 120 Volts, C-B 120 Volts, A-C 208 Volts | B |
| A short circuit exists when there is a connection between two wires or conductors | of different potential |
Created by:
melissafish
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