Question 1 of 10
What is the primary function of the three phases in a three-phase induction motor?
The rotating magnetic field generated by the three phases is essential for the motor's operation.
Question 2 of 10
What happens to a three-phase induction motor if two of the three phases are disconnected while the motor is running?
With two phases lost, the circuit becomes effectively open, preventing current flow and stopping the motor.
Question 3 of 10
If a three-phase induction motor is stopped and two phases are lost, what happens?
Without all three phases, the rotating magnetic field necessary for starting the motor is absent.
Question 4 of 10
What is the consequence of losing two phases in a three-phase induction motor concerning current flow?
An open circuit condition prevents current from flowing.
Question 5 of 10
In a balanced three-phase system, what is the sum of the instantaneous currents in all three lines?
In a balanced system, the currents sum to zero due to the phase differences.
Question 6 of 10
What configuration, star or delta, is commonly used to connect the three-phase lines to a three-phase induction motor?
Both star and delta connections are used depending on the motor's voltage and power requirements.
Question 7 of 10
If only one phase is connected to a three-phase induction motor, and the motor is stopped, what is the immediate effect?
Without all three phases, the rotating magnetic field is absent, preventing the motor from starting.
Question 8 of 10
When two phases are lost, what does the article suggest about the impact on the motor?
The motor stops functioning because the circuit is incomplete.
Question 9 of 10
What is needed from the three phases to complete the circuit in a three phase induction motor?
All the phase conductors are needed for the current to flow, which is necessary to generate the rotating magnetic field.
Question 10 of 10
What kind of current flows when two phases are lost?
The circuit becomes effectively open, preventing current flow.
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