In an induction motor, no-load the slip is generally
A. Less than 1 %
B. 1.5 %
C. 2 %
D. 4 %
Answer: Option A
Solution (By Examveda Team)
In an induction motor, the slip is defined as the difference between the synchronous speed and the actual rotor speed, expressed as a percentage of the synchronous speed. At no-load conditions, the slip of an induction motor is typically very small because the rotor speed is very close to the synchronous speed.Less than 1 %: At no-load, the slip is generally less than 1% because the rotor speed approaches the synchronous speed very closely when the motor is not under load.
1.5 %, 2 %, and 4 %: These values are higher and more characteristic of conditions when the motor is under load. At no-load, these slips would be too high, which does not align with the typical performance of induction motors at no-load conditions.
Thus, Option A: Less than 1 % is the correct choice.
This Question Belongs to Electrical Engineering >> Polyphase Induction Motors
Join The Discussion
Comments (1)
Related Questions on Polyphase Induction Motors
Which is of the following data is required to draw the circle diagram for an induction motor?
A. Block rotor test only
B. No load test only
C. Block rotor test and no-load test
D. Block rotor test, no-load test and stator resistance test
The starting torque of a three phase induction motor can be increased by
A. Increasing slip
B. Increasing current
C. Both (A) and (B)
D. None of the above
Rotor rheostat control method of speed control is used for
A. Squirrel-cage induction motors only
B. Slip ring induction motors only
C. Both (A) and (B)
D. None of the above
since at no load rotor speed is nearly at synchronous speed but not equal to synchronous speed.
so while calculating sleep '%s' =(Ns-Nr)/Ns*100 i,e.... it will give less then 1%