### EE8401 - Electrical Machines - II - Notes - Unit-3 Two marks - EEE 4th Sem

__Subject Name:__ Electrical Machines - II

__Subject Name:__

__Subject Code:__ EE8401

__Subject Code:__

## 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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