Question

Q.1)
Consider the following statements; if the 3 phase induction machine operates
at slip of -0.05. Then the machine will: (1 marks )
All 1, 2, 3 are correct
Ans.
1 and 2 are correct
2 and 3 are correct
only 3 is correct​

Answer 1

Answer:

(i) It has simple and rugged construction.

(ii) It is relatively cheap.

(iii) It requires little maintenance.

(iv) It has high efficiency and reasonably good power factor.

(v) It has self-starting torque.

only 3

Step-by-step explanation:

hope it help you

Answer 2

Answer:

It requires little maintenance

Explanation :

• A 3 phase induction motor is an electromechanical energy conversion device which converts 3-phase input electrical power into output mechanical power.
• A 3 phase induction motor consists of a stator and a rotor.
• The stator carries a 3 phase stator winding.
• The 3 phase rotor carries a short-circuited winding called rotor winding.
• The stator winding is supplied from a 3 phase supply.
• The rotor winding drives its voltage and power from the stator winding through electromagnetic induction.
• They are used for loads that requires speed control.
• E.g. crushers, plunger pumps, cranes & hoists, elevators, compressors and conveyors.

Following is the figure of the 3 phase motor

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