### EE8301 - Electrical Machines - I - Unit-3 Two marks

__Subject Name:__ Electrical Machines - I

__Subject Name:__

__Subject Code:__ EE8301

__Subject Code:__

## B.E. EEE Dept - semester 03

Anna University Regulation 2017 B.E. EEE Dept 3

^{rd}semester EE8301(**Electrical Machines - I**) 2 marks for**3rd unit**is provided below.**EE8301**all units**2 marks**,**Electrical Machines - I all units notes**& syllabus are listed down for students to utilize it for scoring maximum marks with our study materials.## 1.Why the i-λ relationship of a magnetic circuit is almost linear ?

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## 2.What is a multiply excited magnetic field system ?

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## 3.Give any four examples for singly excited magnetic systems.

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## 4.What are the causes for irrecoverable energy loss when the flux in the magnetic circuit undergoes a cycle ?

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## 5.Give examples for multiply excited magnetic field systems and explain the term multiply excited systems.

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## 6.Why do all practical energy conversion devices make use of the magnetic field as a coupling medium rather than an electric field ?

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## 7.Give an example for each of single and multiple excited system.

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## 8.State the principle of electromechanical energy conversion.

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## 9.In a magnetic circuit with a small air gap, in which part the maximum energy is stored and why ? (or) Predominant energy storage occurs in the air gap of an electromechanical energy conversion device. Is this statement correct ?

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## 10.What are the three basic principles for the electromechanical energy conversion ?

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## 11.What is Magnetic saturation ?

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## 12.Write the principle of energy conservation.

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## 13.Give examples for continuous energy conversion equipment and force producing devices.

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## 14.Define coil span factor or pitch factor.

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## 15.Define distribution factor or winding factor.

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## 16.Define the term pole pitch.

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## 17.Define the term synchronous speed.

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## 18.What is the function of an exciter ?

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## 19.What are the advantages when the stator coils are short pitched ?

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## 20.Write an expression for synchronous speed.

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## 21.Explain the following terms with respect to rotating electrical machines. a) Pole pitch b) Chording angle

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## 22.State the necessary conditions for production of steady torque by the interaction of stator and rotor fields in an electric machine.

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## 23.Define rotating magnetic field.

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## 24.Explain the concept of electrical degree. Give the relation between electrical angle and mechanical angle.

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## 25.Define coil span or coil pitch.

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## 26.What is full pitch and short pitch coils ?

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## 27.How rotating field can be obtained ?

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## 28.What is two layer winding ?

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## 29.State the assumptions made while obtaining m.m.f. space wave.

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## 30.What is slot angle ? How it is accounted for ?

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## 31.Why is the efficiency of a three phase induction motor is less than that of a three phase transformer ?

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## 32.What is meant by mechanical angle ? Explain.

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## 33.What is meant by SPP ? What is its significance ?

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## 34.What is meant by distributed winding ?

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## 35.Write the equation, which relates rotor speed in electrical and mechanical radian/second.

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## 36.What are the requirements of Excitation system ?

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## Important links:-

EE8301 - Electrical Machines - I - Unit-1 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-2 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-3 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-4 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-5 Two marks (Click here)

EE8301 - Electrical Machines - I - All unit notes (Click here)

EE8301 - Electrical Machines - I - Unit-2 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-3 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-4 Two marks (Click here)

EE8301 - Electrical Machines - I - Unit-5 Two marks (Click here)

EE8301 - Electrical Machines - I - All unit notes (Click here)

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