Lineman EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW VERSION!!

Lineman EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW VERSION!! what is the maximum amount of primary current you want to break with a hotline clamp? - Answer- 10 amps what is joint construction? - Answer- when 2 utilities share the same pole or same ditch what voltages are wye connections? - Answer- 120/208 277/480 what is the high leg? - Answer- that is not physically connected to a mid point ground what are the three main parts of an underground cable? - Answer- conductor, insulation, and semiconductor what is the percent that a transformer should be sized at? - Answer- 125% and fuse for 200% how are secondary leads on the inside of a transformer labeled? - Answer- ACBD what must you always do before changing taps of a transformer? - Answer- deenergize before changing, raise the taps to lower the voltage, lower the taps to rise voltage what are you doing to the coils when you change taps? - Answer- When changing taps you ate lengthening, or shortening the primary coil what do you do with taps in a bank? - Answer- Make sure all taps on all transformers the same which way do polarity arrows point in additive and subtractive transformers? - Answer- Additive, arrows point opposite directions Subtractive, arrows point same directions what is meant be the skin affect in a conductor? - Answer- 92% of current flows on the outside of the conductor does a true delta have any relation to ground? - Answer- no If you saw a nameplate that read 12,450/7,200ygrd on a transformer, what would you think? - Answer- if small voltage is second number the transformer is a single bushing CSP pot, it must be hooked up wye What do open and closed banks perform at? - Answer- open bank 86.6% of the total KVA of the bank closed bank performs at 100% of the KVA of the bank By industry standards what indicates if a transformer is additive or subtractive? - Answer- 8,600 volt or less/200 KVA or less is an additive pot. Anything over that is a subtractive pot. What indicates that a transformer is over 100 KVA - Answer- Over 100 KVA transformer have 4 bushings what do you do with the primary grounds of wye/Delta? wye/wye? - Answer- wye/delta you fly wye/wye you tie what is the disadvantage of tying down a closed wye//delta - Answer- It may burn up the other pots if one goes bad, the other two will try to pack the load how much can secondary voltage be off of its rated output? - Answer- no more then + or - 5% what do you always check after switching? - Answer- always check switch open after opening and check closed after closing what two things must you have before switching a regulator into by-pass - Answer- the hand on the dial must be on zero and the neutral light must be on before switching the regulator into by-pass, two visuals. what do the different colors indicate on circuit switchers? - Answer- grey- means you can open red- means you cannot operate the switch clear- means you can open it yellow- means contacts are open what are the dangers of Auto-Transformers? - Answer- Autotransformers are dangerous because of the metallic connection between the high and low voltage circuits, it increases the chance of the high voltage being put on the secondary side. what is the maximum resistance a ground rod should have? - Answer- 25 ohms If you have a URD section out and a reclosure or sectionalizer did not operate, what would you expect? - Answer- Blowen riser fuse, blown secondary fuse, elbow burned off or popped off, breakers tripped What is a fused cut-out? - Answer- A switch that stops current flow in a fault situation What is a racking the cable? - Answer- In URD vault, it is when you lay the cable around the vault in the racks to keep it supported, larger wires on bottom, smaller wires on top. what is radial feed - Answer- a feed with one primary source with no back feed or loop capabilities What is a loop feed - Answer- a feed that has more than one primary source, so you can back feed in case of a fault or outage. when do you use protective grounds - Answer- whenever you are working on de-energized lines of 600 volts or more what are skirts(petticoasts) on insulators for? - Answer- So there is more surface area for tracking to reduce the chance of flashover when can a switch be open in a substation - Answer- only when you have permission form the power dispatcher having jurisdiction What is an elbow - Answer- an underground primary cable termination with load break capability why do you phase circuits? - Answer- so you know if you have the same potential when paralleling what is a rotation meter? - Answer- Phase sequence indicator what is the mid-point ground on the secondary side of a distribution lighting transformer, and what is its function? - Answer- It is the center bushing or center 2 bushings on transformers where 2 coils are connected and grounded to get 120/240 or 240/480 pots what does it mean to bond something - Answer- It is an electrical connection from one conductive element to another for purpose of reducing the difference of potential or providing suitable conductivity for fault current What is step potential? - Answer- Difference in potential between 2 points of the ground separated by one phase what is a recloser? - Answer- A multishot device with the ability to automatically interrupt a fault and reclose what dose a name pate that reads 240/120 tell you - Answer- pad mount, that has one secondary coil that had a physically tapped mid point ground