AC power has three basic frequencies.
In the United States, the utility electrical power transmission/distribution frequency is held at ________ Hz.
In other countries, the utility electrical power transmission/distribution frequency may be held at ________ Hz.
The power distribution frequency for aircraft and naval equipment (aeroplanes and ships) is often held at ________ Hz.
A) 80 ; 50 ; 600
B) 20 ; 40 ; 400
C) 60 ; 50 ; 400
D) 100 ; 20 ; 500
Show Answer
Answer:C
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