Preview Questions Substation Technician | Role Specific Skill

Question 1: How can electromagnetic interference (EMI) be mitigated in substation equipment?

Which action should you take?

Choose only one option

By minimizing the number of components in the circuit

By using proper shielding and grounding methods

By reducing the frequency of electrical pulses

By increasing insulation on the equipment

Question 2: What should you do if contact resistance measurements are higher than acceptable levels?

Which action should you take?

Choose only one option

Perform a voltage test on the breaker

Inspect and clean the contacts, and replace any worn components to restore proper operation

Increase the current passing through the breaker

Increase the gap between contacts to reduce resistance

Question 3: How do you diagnose a faulty transformer in a substation?

Which action should you take?

Choose only one option

Check the load current through the transformer

Measure the core temperature and replace oil

Measure insulation resistance and check for oil contamination

Inspect the bushings visually for cracks

Question 4: What is the role of overcurrent protection in transformer maintenance?

Which action should you take?

Choose only one option

To regulate the output voltage under varying load conditions

To adjust the number of turns in the winding under load conditions

To protect the transformer from damage due to excessive current by interrupting the flow when a fault is detected

To prevent oil overheating in the transformer

Question 5: When conducting a no-load test on a transformer, what is the primary factor being measured?

Which action should you take?

Choose only one option

Magnetizing current and core losses

Dielectric breakdown voltage

Load current in the secondary winding

Winding resistance

Question 6: Which test is most commonly used to detect potential partial discharge activity in a transformer?

Which action should you take?

Choose only one option

Partial discharge (PD) testing

DC insulation resistance test

Power frequency withstand test

High-voltage breakdown test