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A collection of practice questions and answers for the journeyman lineman exam. It covers various topics related to electrical theory, transformer operation, safety procedures, and pole construction. Designed to help individuals prepare for the exam by providing a comprehensive overview of key concepts and practical applications.
Typology: Exams
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A 10 KVA transformer is rated 7200 volts primary and 120 volts secondary. What is full load current? - ✔✔✔ Correct Answer > 10,000/120=83.3 primary 7200/120= 6 60 to 1 ratio 83.3/60= 1.38 secondary What qualities are involved in OHM's Law? What is electrical horsepower? - ✔✔✔ Correct Answer > Voltage, current, and resistance 746 watts
Pole steps should be spaced what distance apart? - ✔✔✔ Correct Answer > 18" At what angle does a lifting sling have the same weight stress as the load being lifted? - ✔✔✔ Correct Answer > 30* When paralleling two transformers, what should be checked to be sure of satisfactory results? - ✔✔✔ Correct Answer > Polarity, impedance, and voltage A three phase transformer voltage is 66000/12470Y. Full load on high side is 13.1 amps. What are the amps on secondary? What is the KVA capacity? - ✔✔✔ Correct Answer > 66000/12470=5. 5.29x13.1=69.29 or 69.3amps secondary 12470x69.3x1.
How do you tell how much pull will be needed to lift a known weight with a double to double block and tackle? - ✔✔✔ Correct Answer > Divide the weight by the number of running lines over moveable sheaves. 1000/4=250 or 25% per line. Can transformers of different polarity be parallel? How do you test polarity? - ✔✔✔ Correct Answer > Yes H1. H / VM
X1. X Make drawings of 3 single phase transformers connected delta wye. - ✔✔✔ Correct Answer > Draw If a guy lead has a ratio of 1 to 1 on a 50 ft pole, what is the guy lead distance? - ✔✔✔ Correct Answer > 50 ft A. Define load factor. B. Define KVA
C. Define KW - ✔✔✔ Correct Answer > A. Ratio of average load to peak load B. Apparant power Amps x volts/ C. True power Amps x volts xPF/ Should a foreman be a boss or a leader? If you don't understand a job, should it be discussed with the crew members? - ✔✔✔ Correct Answer > Leader Yes/ a foreman How much safety factor should you consider in deciding what chains or rope to handle a certain load? - ✔✔✔ Correct Answer > 2 to 1 when new 4 to 1 six months or older Which is the primary winding of a transformer?
C. 1-1 leads What fahrenheit tempature would a transformer have to be 55% centigrade above ambrient of 98* F? - ✔✔✔ Correct Answer > 55x1.8=99 + 32 = 131F 131 + 98= 229
