Question 126Electricity/Electronics - 1st Asst/Chief70% to pass
Which of the following problems will most likely occur if the starting winding of a split- phase induction motor failed to cutout once the motor approached operating speed?
AI Explanation
The correct answer is C) The start winding will burn out.
If the starting winding of a split-phase induction motor fails to cut out once the motor reaches operating speed, the start winding will continue to carry the full current, causing it to overheat and eventually burn out. This is because the start winding is designed to provide additional torque during the starting phase, but it is not intended to run continuously at full load. Leaving the start winding engaged after the motor has reached speed will lead to its destruction.
The other options are incorrect because: A) The motor will not overspeed, as the failure of the start winding will not affect the running winding's speed. B) The motor will not run at a reduced speed, as the failure of the start winding will not reduce the running winding's speed. D) There is no time delay mechanism that would stop the motor in this scenario.
Related Questions
#124 A digital multimeter is set up as shown in the illustration to evaluate the single-circuit stator windings of a squirrel cage induction three-phase motor. The following readings are taken: From T1 to T2 reads 1.6 ohms. From T2 to T3 reads "OL" ohms. From T3 to T1 as shown reads "OL" ohms. What condition is indicated? Illustration EL-0219 #125 What would happen if the centrifugal switch or relay, for cutting out the starting winding of a split-phase induction motor, failed to open while the motor was in operation? #127 When testing the rotor of a synchronous motor for short circuits, a low voltage source is applied across the rotor coils through the collector rings. What would be the indication of a short- circuited coil? #128 As shown in the illustrated diagnostic setup for locating an open field coil of a ten- pole synchronous motor, if 240 VDC is applied across the brushes, what statement is true if one of the field coils is open-circuited? Illustration EL-0203 #129 In the illustration what is the component labeled "C"? Illustration EL-0033