Preview Questions Substation Technician | Role Specific Skill

Question 1: What is the common cause of a circuit breaker failing to clear a fault condition?

Which action should you take?

Choose only one option

Short-circuit in the control wiring

Inaccurate calibration of the fault detection relay

Fault in the breaker's arc-quenching medium

Insufficient oil level in the breaker mechanism

Question 2: What is the minimum number of people required to perform high-voltage switching operations in a substation?

Which action should you take?

Choose only one option

Two people: one to operate the switch and one to monitor safety

One person, as long as the equipment is tagged and locked out

At least four people, including two safety officers

Three people: one to operate the switch, one to monitor, and one to handle emergency situations

Question 3: During the "high-voltage withstand test," what is primarily being measured?

Which action should you take?

Choose only one option

The breaker's dielectric strength at elevated voltage levels

The breakdown voltage between the breaker's internal components

The insulation resistance under normal operation

The maximum allowable fault current

Question 4: How do you perform a secondary injection test on a protection relay to ensure correct functionality?

Which action should you take?

Choose only one option

By injecting a known test signal into the relay and measuring its response according to the relay's settings

By visually inspecting the relay's contacts and assuming proper operation

By resetting the relay and observing its operation under normal conditions

By replacing the relay without performing any tests

Question 5: What type of test is performed to assess the mechanical operation of a circuit breaker?

Which action should you take?

Choose only one option

SF6 leakage test

Contact resistance test

Insulation resistance test

Timing test

Question 6: What does the NFPA 70E standard govern in the workplace?

Which action should you take?

Choose only one option

Electrical safety requirements for workers to reduce the risk of electrical accidents

Protection systems for overhead lines

Transformer protection regulations

Grounding practices for electrical systems