Free practice test

Substation Technician Practice Test

Check what you know about the substation technician job with 15 free questions and instant explanations.

Updated By the Career Education Institute Curriculum Team
About this practice test

15 multiple-choice questions on substation technician knowledge, safety and vocabulary. Submit to see your score and explanations, or open any question’s answer as you go. Nothing is saved or shared.

Question 1 of 15A protective relay:
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Answer: Detects faults and trips breakers. It protects the system.

Question 2 of 15Apply grounds:
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Answer: Ground end first. Ground end first.

Question 3 of 15A megger tests:
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Answer: Insulation resistance. It checks insulation.

Question 4 of 15Dissolved gas analysis:
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Answer: Checks transformer oil. Gases reveal faults.

Question 5 of 15Before relay testing:
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Answer: Isolate trip outputs. Prevent accidental trips.

Question 6 of 15Which term matches this definition: “Conductors that connect equipment.”
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Answer: Bus. Bus: Conductors that connect equipment.

Question 7 of 15What does “PT” mean?
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Answer: Potential transformer.. PT: Potential transformer.

Question 8 of 15Which term matches this definition: “Remote monitoring and control.”
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Answer: SCADA. SCADA: Remote monitoring and control.

Question 9 of 15What does “Dissolved gas analysis” mean?
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Answer: Oil testing for transformer health.. Dissolved gas analysis: Oil testing for transformer health.

Question 10 of 15Which term matches this definition: “Changes voltage levels.”
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Answer: Transformer. Transformer: Changes voltage levels.

Question 11 of 15What does “One-line diagram” mean?
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Answer: A simplified system drawing.. One-line diagram: A simplified system drawing.

Question 12 of 15Which term matches this definition: “Detects faults and trips breakers.”
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Answer: Protective relay. Protective relay: Detects faults and trips breakers.

Question 13 of 15What does “Circuit breaker” mean?
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Answer: Interrupts fault current.. Circuit breaker: Interrupts fault current.

Question 14 of 15Which term matches this definition: “Current transformer.”
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Answer: CT. CT: Current transformer.

Question 15 of 15What does “Substation” mean?
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Answer: A facility that switches and transforms power.. Substation: A facility that switches and transforms power.

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