Thank you to everyone who tested their knowledge of the line trade by taking one or both of the quizzes created by the International Lineman's Rodeo Association (ILRA) during the 2020 Lineman Celebration Week.
We will soon be awarding prizes to a few of the lucky winners, but in the meantime, here are the answer keys for Quiz #1 and Quiz #2 for Super Saturday, which was sponsored by Jelco and Bierer Meters.
Super Saturday Quiz #1:
1. What instrument is used to measure electric current?
a. Ampere meter
b. Watthour meter
Answer: a. Ampere meter (a watthour meter is used to measure electric energy).
2. What is the most common frequency of alternating current here in the United States?
Answer: 60 hertz or 60 cycles
3. Why are disconnect switches installed in series with circuit breakers?
Answer: To facilitate isolating the equipment (circuit breakers) for maintenance.
4. Which conductor of a three-phase four-wire distribution system is grounded?
Answer: Neutral conductor
5. What is the minimum recommended depth for setting a pole in soil?
a. 3 ft.
b. 5 ft.
c. 7 ft.
Answer: b, 5 ft
6. What is the rule for determining the setting depth for a pole to be set in soil?
Answer: 10% of the length of the pole plus 2 ft.
7. What is the main purpose of a distribution transformer?
Answer: To reduce the primary voltage of the distribution system to the voltage serving the customer.
8. What would be the bushing designation (X) of the secondary bushings for a subtractive and additive polarity transformer?
Answer: Subtractive – X1, X2, X3 left to right Additive- X3, X2, X1 left to right
9. If all six primary bushings of a bank of transformers were tied together and energized, what type of connection would that be?
Answer: Delta connection
Super Saturday Quiz #2 Answer Key
1. In a three-phase wye/delta bank, what is the purpose of grounding only one of the X2 bushings on the secondary side?
Answer: To provide lighting for the customer
2. In a 120/208 three-phase bank, if a voltage check indicated 120 V phase-to-ground on all three pots and phase to phase readings were 208/208/0, what would the problem most likely be?
Answer: Two of the transformers are being fed by the same phase.
3. How does the current get from the primary winding to the secondary winding in a distribution transformer?
Answer: Through the process of induction.
4. The process of grounding where all conductors are short-circuited, grounded, and banded to the pole or structure is called what?
Answer: Equi-potential Grounding
5. When grounding for personal protection on a distribution system, the best ground source available would be what?
Answer: System neutral
6. What is the maximum use voltage for class 2 rubber gloves?
a. 13,000 V
b. 15,000 V
c. 17,000 V
Answer: c. 17,000 V
7. What is used on a distribution line to help alleviate voltage fluctuation automatically, due to load?
Answer: Voltage Regulator
8. Before clearing a voltage regulator from the line, what setting must the voltage regulator be in?
Answer: “0” or neutral.
9. When a digger derrick is properly grounded to the system common neutral, would it be safe to contact the truck with unprotected parts of your body (Yes or No) and why?
Answer: No, it would not be safe because you would be at the same potential as the neutral and would place you in parallel with any stray voltage or fault current that may be induced on the system neutral.
