### EE8301 - Electrical Machines - I - Unit-4 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**4th 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.State the basic operation required for generator action to exist.

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## 2.State Fleming's right hand rule.

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## 3.What is the nature of the induced e.m.f. in a d.c. generator ? How it is converted to d.c. ?

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## 4.What are the functions of yoke ? What is the choice of material for the yoke ?

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## 5.Why pole shoe has been given a specific shape ?

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## 6.State the function of field winding in a d.c. machine.

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## 7.What are the functions of armature core ? What is the choice of material for the armature core ?

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## 8.State the functions of armature winding.

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## 9.State the functions of commutator.

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## 10.What is the function of brushes ? Why brushes are made up of soft material ?

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## 11.Which are the two types of armature windings used in d.c. machines ? Explain in brief.

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## 12.State the e.m.f. equation of a d.c. machine.

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## 13.State the advantages of double layer winding.

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## 14.Define a pole pitch.

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## 15.Define back pitch and front pitch.

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## 16.What is armature reaction ? What are its effects ?

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## 17.What is MNA and GNA ?

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## 18.Define commutation and commutation period.

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## 19.What is linear, under and over commutation ?

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## 20.State the methods of improving commutation.

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## 21.How the generators are classified based on method of excitation ?

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## 22.Explain how self excited d.c. generator builds its voltage ?

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## 23.State the applications of various types of generators.

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## 24.Define critcal field resistance.

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## 25.Define critical speed.

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## 26.Why generators are operated in parallel ?

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## 27.The series field winding has low resistance while the shunt field winding has high resistance. Why ?

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## 28.What are the conditions for parallel operation of D.C. generators ?

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## 29.What are the major parts of a D.C. generators ?

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## 30.What is a commutator ?

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## 31.Why the air gap between the pole pieces and the armature is kept very small ?

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## 32.Why does curving the pole faces in a d.c. machines contributes to a smoother d.c. output voltage from it ?

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## 33.What is meant by reactance voltage ?

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## 34.Specify the role of Interpoles in DC machine ?

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## 35.What is meant by residual emf in DC generator ?

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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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