JOURNEYMAN LINEMAN LATEST EXAM
PREP QUESTIONS AND ANSWERS PDF 2026
▶ When paralleling two transformers, what should be checked to be sure of
satisfactory results?. 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?. Answer: 66000/12470=5.29
5.29x13.1=69.29 or
69.3amps secondary
12470x69.3x1.732
-------------------
1000
=14.967
Or 15KVA capacity
▶ Why are relays used on OCB controls?. Answer: To sense overcurrent
and trip OCB's
▶ High side fuses are ordinarily from 200 to 300% of full load current of
transformers, if short circuit capacity will permit. What size fuse will be
needed for a 66 KV, 1500KVA at 300%. Answer: 66000/1.732=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 calculate the proper tap to deliver 7620 volts from a
PREP QUESTIONS AND ANSWERS PDF 2026
▶ When paralleling two transformers, what should be checked to be sure of
satisfactory results?. 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?. Answer: 66000/12470=5.29
5.29x13.1=69.29 or
69.3amps secondary
12470x69.3x1.732
-------------------
1000
=14.967
Or 15KVA capacity
▶ Why are relays used on OCB controls?. Answer: To sense overcurrent
and trip OCB's
▶ High side fuses are ordinarily from 200 to 300% of full load current of
transformers, if short circuit capacity will permit. What size fuse will be
needed for a 66 KV, 1500KVA at 300%. Answer: 66000/1.732=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 calculate the proper tap to deliver 7620 volts from a
