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NETA Level 2 Certified Assistant Electrical Testing Specialist Sample Questions:

1. Secondary injection testing of a low-voltage air circuit breaker is:

A) Less comprehensive than primary injection testing
B) More comprehensive than primary injection testing
C) Not permitted by NETA standards
D) Equivalent to primary injection testing for acceptance

2. A current of30 Ais measured using a100 A, 3% accuracyammeter. What is the maximum possibleactual error?

A) ±10%
B) ±0.9 A
C) ±1.5 A
D) ±3 A

3. 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 becomes more sensitive and trips faster
C) Overcurrent protection will nuisance trip due to CT saturation
D) Ground-fault protection will not function correctly because the residual current sums to zero

4. What is theminimum oxygen concentrationallowed before entering a transformer or similar enclosed electrical space?

A) 16.0%
B) 19.5%
C) 11.5%
D) 10.0%

5. In azone-selective interlocking (ZSI)scheme, what condition allows an upstream breaker to tripwithout intentional delay?

A) Absence of a restraint signal during a fault
B) Loss of communication between breakers
C) Short-time delay set to minimum
D) Receipt of a restraint signal from downstream breaker

Solutions: