Induction Machine Question and Answers:
Why Induction Motor name has come?
Answer: In Induction motor there is no electrical contact to the rotor. Electrical currents are induced in to the rotor circuit. Hence the name Induction motor has come.
What happen when Induction motor run at synchronous speed?
Answer: When the induction motor runs at synchronous speed, there will be no induced emf in to the rotor circuits. Therefore no rotor currents and no torque is developed. Hence Induction motor will come to halt.
What are different types of Induction Motors available?
Answer: Induction motors are of two types based on their construction
- Squirrel cage Induction motor (As the rotor winding will be like cage)
- Slip Ring Induction motor or wound rotor induction motor
What is the advantage of Slip Ring Induction Motor?
Answer: By providing external resistance to the rotor circuits during starting of the motor starting torque can be improved and starting currents can be reduced
What is the advantage of Squirrel Cage Induction Motor?
Answer: Low cost, rugged construction and less maintenance are the advantages of squirrel cage induction motors
What is the speed variation of the induction motor from no load to full load?
Answer: The decrement in the speed of the small rating Induction Motor from no load to full load will be around 4 to 5 percent and 2 to 2.5 percent in the case of large size induction motors
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