EE8401 - Electrical Machines - II - Notes - Unit-3 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 3rd 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.Under what condition, the slip in an induction motor is a) Negative b) Greater than one.

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2.What are the two fundamental characteristics of a rotating magnetic field ?

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3.What measure can be taken for minimizing the effect of crawling in a 3-phase induction motor ?

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4.What is the function of slip-ring in 3-phase induction motor ?

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5.What is an induction generator ?

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6.What is crawling and cogging in induction motor ?

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7.What are the purposes that could be served by external resistors connected in the rotor circuit of phase wound induction motor ?

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8.How can the reversal of rotation of polyphase induction motor be attained ?

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9.Write the advantages of slip ring induction motor.

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10.What are the merits of inner and outer cage of double cage induction motor ?

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11.Name the type of rotors of induction motors.

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12.Write down the advantages of double cage rotor induction motor over single squirrel cage motor.

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13.What is locked rotor torque ?

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14.Why slots on the rotor of induction motor are skewed ?

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15.Why the stator core of induction motor made of silicon content steel stamping ?

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16.A 3 phase induction motor does not run at synchronous speed. Why ?

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17.What is rotating magnetic field ? At what speed it rotates ?

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18.On which factors the speed of rotating magnetic field depends ?

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19.For a machine having 4 poles, find the speed of rotating magnetic field if it is excited by 50 Hz supply.

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20.What is slip of an induction motor ? State its expression.

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21.What is the slip at start ? How slip affects the rotor frequency ?

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22.State the various losses occurring in an induction motor.

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23.State the applications of various types of induction motors.

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24.Why the reactance of three phase induction motor greatly varies between starting and running condition ?

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25.Why rotor core losses are negligible in three phase induction motor ?

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26.State the principle of 3 phase induction motor.

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27.Mention the advantages of squirrel cage induction motor.

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28.State the effect of rotor resistance on starting torque.

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29.Is it possible to add an external resistance in the rotor circuit of a cage induction motor ? Justify your answer.

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30.Why three phase induction motor called singly excited motor ?

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31.Why are most of the 3-phase induction motors constructed with delta connected stator winding ?

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32.What is meant by single phasing.

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33.What are the effects of single phasing of an induction motor ?

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34.The starting torque of a squirrel cage induction motor cannot be altered when the applied voltage is constant . Why ?

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35.How do change in supply voltage and frequency affect the performance of a 3 phase induction motor ?

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36.What are the merits and demerits of double squirrel cage induction motors ?

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37.A 3 phase, 4 pole, induction motor operates from a supply whose frequency is 50 Hz. Calculate the frequency of the rotor current at standstill and the speed at which the magnetic field of the stator is rotating.

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38.Explain why an induction motor, at no load, operates at very low power factor.

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39.What is the use of circle diagram of an induction motor ?

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40.Which two tests are conducted to obtain the data for the circle diagram ?

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41.How to conduct no load test on induction motor ?

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42.State the effect of increase in load on the power factor, efficiency, input current and slip of an induction motor.

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