IEC EXAMINATION TEST 2026 QUESTIONS WITH ANSWERS GRADED A+

IEC EXAMINATION TEST 2026 QUESTIONS
WITH ANSWERS GRADED A+

◉ c. voltage surges. Answer: A lightning arrester is a device that protects
electrical equipment from ___.


Select one:
a. short circuits
b. ground faults
c. voltage surges
d. all of these


◉ d. all of these. Answer: In addition to protecting a motor from single-
phasing, phase failure relays provide protection against ___.


Select one:
a. undervoltage
b. voltage unbalance
c. phase reversal
d. all of these

,◉ c. busbars. Answer: Busway sections contain ___. These can be
tapped for connection to utilization equipment.


Select one:
a. circuit breakers
b. transformers
c. busbars
d. all of these


◉ a. 10. Answer: Typically, motors can operate without damage if the
circuit voltage is within ___% of the nameplate rating.


Select one:
a. 10
b. 2
c. 5
d. 25
e. 15


◉ d. 8%. Answer: A voltage unbalance of 2% could cause a current
unbalance of ___ or greater.


Select one:

, a. 10%
b. 5%
c. 10 A
d. 8%
e. 2%


◉ b. are out of phase. Answer: An interconnection relay utilized for
distributed generation will open if the two power sources ___.


Select one:
a. are not at the same voltage
b. are out of phase
c. have different frequencies
d. any of these


◉ c. both a and b. Answer: Utility customers with motor loads add
capacitor banks to the system in order to reduce the ___.


Select one:
a. power factor
b. billing penalties
c. both a and b