NETA System Commissioning and Analysis 2

Question 1

During transformer commissioning, what is the primary purpose of performing a turns ratio test?

Accepted Answer

Confirm the transformer ratio matches nameplate data within acceptable tolerance

Answer

Verify insulation resistance between windings

Answer

Measure winding resistance to detect shorted turns

Answer

Check for partial discharge activity under load

Question 2

When commissioning a medium-voltage switchgear assembly, which test verifies that protective relay trip functions will operate the correct breaker?

Accepted Answer

Functional trip testing

Answer

Insulation resistance test

Answer

Contact resistance test

Answer

Dielectric withstand test

Question 3

A commissioning engineer measures 0.8 power factor on a newly energized motor. Which of the following is the most likely cause?

Accepted Answer

Motor is running at partial load or no load

Answer

Motor is operating under full load

Answer

Insulation is degraded

Answer

Phase rotation is incorrect

Question 4

According to NETA standards, what is the recommended minimum insulation resistance value per kV of operating voltage for medium-voltage cables rated 5 kV and above?

Accepted Answer

1,000 MΩ per kV

Answer

1 MΩ per kV

Answer

100 MΩ per kV

Answer

10 MΩ per kV

Question 5

During commissioning of a generator paralleling system, what test confirms that generators will share load proportionally?

Accepted Answer

Droop characteristic test

Answer

Phase rotation test

Answer

Load bank reactive power test

Answer

Insulation resistance test

Question 6

What does an unusually high contact resistance reading on a circuit breaker main contact indicate during commissioning?

Accepted Answer

Contacts may be pitted, eroded, or improperly aligned

Answer

Contacts are properly lubricated

Answer

The breaker has excessive spring tension

Answer

Insulation is compromised between phases

Question 7

When performing an acceptance test on a grounding electrode system, what instrument is most commonly used to measure soil resistivity?

Accepted Answer

Earth ground tester using the four-point Wenner method

Answer

Megohmmeter

Answer

Clamp-on ammeter

Answer

Oscilloscope