Question 1 of 10
The induction motor is also known as a(n) ________ motor.
Induction motors operate on the principle of electromagnetic induction and do not run at synchronous speed.
Question 2 of 10
If the frequency of the 3-phase supply to the stator of an induction motor increases, what happens to the synchronous speed?
Synchronous speed is directly proportional to the supply frequency (Ns = 120f/P).
Question 3 of 10
The rotating magnetic field in a three-phase induction motor is produced by ________.
The 3-phase AC supply to stator windings generates the rotating magnetic field.
Question 4 of 10
The speed of a three-phase induction motor depends on ________.
Synchronous speed Ns = 120f / P, and the motor speed is closely related to the synchronous speed.
Question 5 of 10
Slip in an induction motor is defined as ________.
Slip = (Ns - Nr) / Ns, where Ns is synchronous speed and Nr is rotor speed.
Question 6 of 10
At synchronous speed, the slip of an induction motor is ________.
At synchronous speed (Nr = Ns), the slip is zero.
Question 7 of 10
At no-load, the slip of an induction motor is typically ________.
At light loads, the rotor speed is close to the synchronous speed, resulting in a small slip.
Question 8 of 10
The rotor frequency in an induction motor is given by ________.
Rotor frequency fr = s * f, where s is slip and f is the supply frequency.
Question 9 of 10
If slip is zero, the rotor induced EMF is ________.
Induced EMF is proportional to the relative speed between the stator field and rotor conductors; if slip is zero, there is no relative motion.
Question 10 of 10
The torque produced in an induction motor is proportional to ________ (at small slips).
At small values of slip, the torque is approximately proportional to the slip.
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