EE8401 - Electrical Machines - II - Notes - Unit-4 Two marks - EEE 4th Sem

Subject Name: Electrical Machines - II

Subject Code: EE8401

B.E. EEE Dept - semester 04

Anna University Regulation 2017 B.E. EEE Dept 4th semester EE8401(Electrical Machines - II) 2 marks for 4th unit is provided below. EE8401 all units 2 marks, Electrical Machines - II all units notes & syllabus are listed down for students to utilize it for scoring maximum marks with our study materials.

1.Give the functions performed by induction motor starter.

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2.State two advantages of speed control of IM by injecting an e.m.f. in the rotor circuit.

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3.Name the type of starters used in 3 phase induction motors.

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4.Write down the methods to control the speed of 3 phase induction motor from its rotor side.

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5.What is the disadvantage of rotor rheostat speed control method ?

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6.List the various methods speed control of 3 phase induction motor.

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7.What will be the effect when stator voltage and frequency of an induction motor are reduced proportionally ?

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8.By which methods the stator poles can be controlled to control the speed of an induction motor ?

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9.What are the limitations of multiple stator winding speed control method ?

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10.What are the disadvantages of cascade control method ?

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11.Explain in brief the following term with respect to induction motor : a. Plugging b. Dynamic braking c. D.C. dynamic braking d. Regenerative braking.

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12.State the drawback of a star-delta starter.

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13.What are the advantages of rotor resistance speed control method ?

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14.What are the different methods of speed control employed in three phase cage induction motor ?

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15.What is meant by slip power recovery scheme ?

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16.Which is the cheapest method of starting a three phase induction motor ?

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17.While controlling the speed of an induction motor, how is super-synchronous speed achieved ?

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18.Explain plugging in three phase induction motor.

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19.Define regenerative braking of induction motors.

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20.When plugging is employed for stopping an induction motor, why is it necessary to disconnect it from supply when the speed reaches close to zero ?

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21.State the advantages of electrical braking.

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22.Under what condition, the slip in an induction motor is a) Negative b) Greater than one.

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23.Why is rotor rheostat starter unsuited for a squirrel cage motor?

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24.What are the conditions for regenerative braking of an induction motor to be possible ?

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25.What are the advantages of slip power scheme ?

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