JOURNEYMAN LINEMAN EXAM REVIEW Q&A 2025, Exams of Electrical Engineering

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JOURNEYMAN LINEMAN EXAM REVIEW Q&A 2025

1. Science 2. [engineering 3. Electrical Engineering What fahrenhcit tempature would a transformer have to be 55% centigrade above ambricnt of 98* I"? — ANS-WW55x1.8=99 #32 = 7312 A conductor is pulled to what tension? — ANS-VV50% To dead end three 2/0 HD conductors which have a breaking strength of 5,927 Ibs cach A. How many B. What size C. What lead should the down guys have? — ANS-VVAL2 Pole steps should be spaced whal distance apart? — ANS-vv 18" At what angle docs a lifting sling have the same weight stress as the load being lifted? — ANS- wv B0# At what angle is the weight stress reduced approximately 1/2 of the load being lifted? — ANS- wv 60# How do you tell how much pull will be necded to lift a known weight with a double to double block and tackle? - ANS—-ww Divide the weight by the number of Can transformers of different polarity be parallel? How do you test polarity? — ANS-vv Wes Make drawings of 3 single phase transformers connected delta wyc. — ANS-VH If a guy lead has a ratio of 1 to 1 on a 50 ft pole, what is the guy lead distance? — ANS-vv50 ft A, Define load factor. B. Define KVA To reduce the current to a safe level for metering purposes. A 10 KVA transformer is rated 7200 volts primary and 120 volts sccandary. What is full load current? — ANS-¥W10,000/1 20=83.3 primary 7200/120= 6 60 to 1 ratio 83.3/60= 1.38 secondary What qualities are involved in OIIM's Law? What is electrical horsepower? — ANS-WWVallage, current, and resistance 746 watts When paralleling two transformers, what should be checked to be sure of satisfactory results? — ANS-AWwe Polarity, impedance, and voltage A three phase transformer voltage is 66000/12470Y. lull load on high side is 13.1 amps. What arc the amps on secondary? What is the KVA capacity? — ANS-WW66000/12470=5.29 5.29x13.1=69.29 or 69.3amps sccondary 12470x69.3x1.732 1000 =14.967 Or 15KVA capacity Why arc relays used on OCB controls? - ANS-WWTo sense overcurrent and trip OCB's Iligh side fuses are ordinarily from 200 lo 300% of full load current of transformers, if short circuit capacily will permit. What size fuse will be needed for a 66 KV, 1S5QOKVA at 300% — ANS—W#W66000/1.732=38106 1500/3=500 KVA. or 500,000 KV 500,000/38106= 13.1 13.1 x 300% = 39.3 or 40amp fuse Show how to calculale the proper tap to deliver 7620 volls fram a 66000/12470Y transformer — ANS—WW12470/1.732=7199.7 or 7200 420/7200=5% from 100=95%