USCG Exam PracticeMotor controllers and remote control
A squirrel-cage induction motor draws approximately what multiple of its full-load current at the moment of starting across the line?
- A. 1 to 2 times full-load current
- B. 2 to 4 times full-load current
- ✓ 5 to 7 times full-load currentCorrect
- D. 8 to 10 times full-load current
Why C is correct
NEETS Mod. 5 §4-1 states that because a squirrel-cage motor at standstill behaves like a short-circuited transformer, its starting inrush is five to seven times full-load current at a poor power factor. This is why reduced-voltage or soft starting is used on large motors.
Cited:NEETS Mod. 5 §4-1