JATC 3-1 EXAM QUESTIONS AND ANSWERS 2025

JATC 3-1 EXAM

1.) The wye system is also known as a _______ system.
A. 3-wire
B. 4 wire
C. Parallel 3-phase
D. Series 3-phase - ANSWERS-B. 4 wire


2.) by using the same substation transformer and adding a neutral
wire, a distribution circuit has been converted from a 2,400 volt delta
to a 4,160 volt wye. After conversation, the voltage across the
substation transformer windings will be _______ .?
A. Increased by 1.7 times
B. Increased by 33%
C. Reduced by 1.73% times
D. Remain the same - ANSWERS-D. Remain the same


3.) By converting a 2,400 volt (delta) primary system to be 4,160-
(wye) system, the capacity of the circuit can be increased by_______
A. 1.73%
B. 33%
C. 58%
D. 73% - ANSWERS-D. 73%

, 4.) The measure of the number of the cycles that occur in one second
is called ______?.
A. Frequency
B. Harmonies
C. Pulse rate
D. Sine wave - ANSWERS-A. Frequency


5.) In an AC circuit, the RMS value is equal to _________ times the
peak value.
A. 0.637
B. 0.707
C. 1.125
D. 1.414 - ANSWERS-B. 0.707


6.) AC circuit loads are described as inductive, capacitive, or _______
loads.
A. Average
B. Effective
C. Resistive
D. RMS - ANSWERS-C. Resistive


7.) current that flows through an inductive load will ________ the
voltage.
A. Be in phase with
B. Have the same sine wave as