Apprentice Lineman Exam Answered

Apprentice Lineman Exam Answered True or False: Customers using three-phase equipment on a URD system must be powered by a set of three-phase conductors separate from the rest of the URD. - Answer- False True or False: A loop feed system can be converted into an open loop system by opening any switching point of the system. - Answer- True True or False: An open loop system is the same as two radial feed systems that have the capability to be joined. - Answer- True A _____________ protects a URD system from over-voltages. - Answer- Surge Arrestor Select the three common types of URD Systems - Answer- Double Feed, Radial Feed, and Loop Feed True or False: A URD system is usually connected to the overhead primary distribution lines at a cable or riser pole. - Answer- True A pad-mounted switch that connects a URD system to an underground feeder cable is called a - Answer- Transclosure Select the types of equipment often found on cable poles. - Answer- Surge protectors, pothead, disconnect switches, and fuses. True or False: Dead-front transformers are fully insulated and can be switched by a lineman using rubber gloves. - Answer- False Select the three types of transformer installations in URD systems. - Answer- Direct-buried, pad-mounted, subsurface. True or False: Tap holes are used to energize and de-energize transformers - Answer- False True or False: URD cable is often made of softer alloys then overhead cable. - Answer- True One a large customer of three-phase power is associated with a URD system, the system may be fed directly from a ___________ through an underground feeder. - Answer- Substation What are the functions of a pothead? - Answer- Terminate the URD cable insulation, Provide the connection between overhead cable and URD cable True or False: URD cable can be installed in the same trench with other types of cable and utilities. - Answer- True When a URD cable must go under a building, a parking lot, or a street, it is often installed in _________ to make replacing the cable easier. - Answer- Conduit Before opening a pad-mounted transformer, a Lineman should perform a __________ to make sure all equipment appears safe. - Answer- Visual Inspection True or False: during a transformer inspection, a lineman uses a system diagram to tag all unmarked cables. - Answer- False True or False: at a pad-mounted switch, a lineman checks the position of each switch against the system diagram and returns each switch to the correct position. - Answer- False __________ allow several different cables to be connected at one point. - Answer- Terminal Strips Which of the following can be a valuable source of information during troubleshooting? - Answer- The troubleman's experience, customers and eyewitnesses, and a dispatcher True or False: if only one customer loses power, while other surrounding customers have normal service, troubleshooting should begin by checking the main feeder. - Answer- False Which of the following is NOT a method of locating a problem? - Answer- Documenting True or False: troubleshooting ends as soon as a problem is located. - Answer- False True or False: patrolling is scheduled only when specific problems have been reported on a line. - Answer- False A Troubleman should always treat lines and equipment as if they are _____________. - Answer- Energized Problems on overhead distribution lines can be related to - Answer- Hardware, wires, poles, equipment True or False: safety is an important part of troubleshooting - Answer- True Which of the following can be used by a Troubleman to establish his location? - Answer- Pole identification numbers, street addresses, landmarks The dispatcher may provide a Troubleman with clearance, instructions, and other information. - Answer- True A common troubleshooting safety practices verifying information by - Answer- Reading all information back to the dispatcher, writing down the dispatchers instructions True or False: before performing any work on on a line, a Troubleman should know what the results of the work will be - Answer- True A line may be sectionalized by opening - Answer- A gang-operated air switch, a fused cutout, a recloser True or False: cutting a jumper is a way of sectionalizing a line - Answer- True A line break is usually installed when - Answer- There is no convenient switch to open, there is no convenient place to remove a hot tap or cut a jumper Using the following illustration, if trouble on the line causes a substation circuit breaker to open, one logical place to begin patrolling for the problem is - Answer- Between the circuit breaker and the first switch Using the following illustration, if a portion of the sectionalized primary line is re-energized, and remains energized then - Answer- That section may have no problem True or False: phase-to-ground voltage is tested by connecting both voltage tester probes to the ground terminal - Answer- False If two customers are serviced by the same distribution transformer, and both are without service, the problem is likely to be - Answer- In the secondary main, the transformer, or before the transformer With the transformer fuse intact, a no voltage output reading at a distribution transformer could indicate - Answer- A problem somewhere in the source circuit, a problem somewhere in the transformer When viewed from the secondary side of a transformer, the primary bushing on the left-hand side is designated as - Answer- H1 On additive polarity transformers, the secondary bushing on the right hand side of the unit is designated as - Answer- X1 True or False: when a transformer is fully loaded, it can supply it's rated output voltage, plus its percent impedance - Answer- False A transformer that can be energized by two different primary voltages, depending on the position of a switch, is generally known as a ____________ transformer - Answer- Dual-Voltage