Question 131Electricity/Electronics - QMED70% to pass
Which device will stop the motor shown in the illustration in case of a short-circuit (high current) motor fault? Illustration EL-0080
AI Explanation
The correct answer is B) disconnect switch fuses FU1, FU2, and FU3.
In the event of a short-circuit or high current fault in the motor circuit, the disconnect switch fuses FU1, FU2, and FU3 would be the first line of defense to stop the motor. These fuses are positioned before the motor and would quickly open to interrupt the flow of excessive current, protecting the motor from damage.
The other options are not correct because: A) the transformer primary fuses FU4 and FU5 are not directly in the motor circuit, C) the transformer secondary fuses FU6 and FU7 would not be able to stop the motor, and D) the overload relay is designed to protect against prolonged overloads, not immediate short-circuit faults.
Related Questions
#129 In a short-shunt cumulatively compound-wound DC motor, how is the shunt field connected? #130 Why are motor controllers seldom troubled by grounds? #132 In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 5 reads line voltage, while the voltmeter reading between 2 and 5 reads 0 VAC. What is most likely the problem? Illustration EL-0007 #133 If you hear a loud buzzing noise coming from a magnetic motor controller, what should you do? #134 The motor starts when the start button in the illustration is pushed, but stops when the button is released. What is most likely the trouble? Illustration EL-0007