EEE Job Interview Question Answer [ Part 4 ]

EEE Job Interview Question Answer [ Part 4 ]

1.Question 1

Suppose an AC induction motor is working at locked rotor torque. what's the speed of the motor?

 

-The speed is zero

 

 

2.Question 2

Where are starting windings, relative to the stator windings within the split phase motor that we reviewed within the video on the split phase motor?

 

-The starting winding are located next to the stator winding

 

 

3.Question 3

At which point within the torque-speed curve is that the 3-phase AC motor current the highest?

 

-At motor startup when the speed is zero

 

 

4.Question 4

Suppose an AC induction engine or motor is showed 4% slip and 3600 RPM synchronous speed (Ns). What is the rotor speed (Nr) in RPM?

 

Speed, S% = (Ns-Nr)/Ns

-Nr = 3456

 

 

5.Question 5

What happens to the starting torque of a wound-rotor motor once you increase the resistance asynchronous with the rotor windings?

 

-It increase