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NETA Level 2 Certified Assistant Electrical Testing Specialist Sample Questions:

1. In which three-phase configuration areline current and phase current equal?

A) Wye
B) Delta
C) Open-delta
D) Corner-grounded delta

2. On an electrical schematic, adot on a current transformer symbolindicates:

A) Burden rating
B) Polarity
C) Grounded side
D) Metering accuracy class

3. Duringprimary current injection testingof a low-voltage circuit breaker, the breaker trips instantaneously at
8× its long-time pickup setting, even though the instantaneous element is set to10×. What is the MOST likely cause?

A) Improper test lead placement
B) CT saturation
C) Thermal memory enabled
D) Incorrect short-time delay setting

4. What is the purpose of ablow-out coilin a circuit breaker?

A) Limit short-circuit current
B) Increase contact pressure
C) Form an electromagnetic field to help extinguish the arc
D) Reduce contact resistance

5. A ground conductor is routed through azero-sequence current transformer (CT)together with the phase conductors feeding the load. What is the most likely result?

A) The CT secondary will produce a higher than normal burden voltage
B) Ground-fault protection will not function correctly because the residual current sums to zero
C) Overcurrent protection will nuisance trip due to CT saturation
D) Ground-fault protection becomes more sensitive and trips faster

Solutions: