Question 1 of 10
What is the primary consequence of single-phasing in a three-phase induction motor?
Single-phasing leads to increased current in the remaining phases, causing overheating.
Question 2 of 10
What happens to the current drawn by the motor when single-phasing occurs?
The current in the remaining phases increases substantially due to the unbalanced load.
Question 3 of 10
If a three-phase induction motor is operating with one phase lost and is connected to a rated load, what is the most likely outcome?
With a full load, the motor will likely stall due to the imbalance and increased current.
Question 4 of 10
What device is commonly used to prevent single-phasing in three-phase supply systems?
Single-phase preventers are specifically designed to detect and protect against phase loss.
Question 5 of 10
What happens if a three-phase induction motor is started with one phase already disconnected?
The motor will not start because the rotating magnetic field cannot be established properly.
Question 6 of 10
What is the effect on the motor if the load is 1/3rd (33%) of the rated load when single phasing occurs?
Even with a reduced load, the increased current can cause the motor to run less effectively.
Question 7 of 10
What component is most likely to fail first in a three-phase induction motor due to single-phasing?
The stator windings will overheat and the insulation will break down first.
Question 8 of 10
Which of the following is NOT a common cause of single-phasing?
A short circuit between phases is a different type of fault.
Question 9 of 10
What happens if the motor is driving and one phase gets lost when under-rated loads?
The motor may operate without noticeable changes because the load is not enough to cause any immediate damage.
Question 10 of 10
What is the main reason why single-phasing is harmful to three-phase induction motors?
The increased current in the remaining phases causes overheating, potentially damaging the motor.
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