### EE8401 - Electrical Machines - II - Notes - Unit-1 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**1st 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.What are the two types of synchronous generators ? Where are they used suitably ?

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## 2.Write down any four advantages of short-pitch winding in synchronous machines. (or) What is the necessity of chording in the armature winding of a synchronous machine ?

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## 3.Which type of synchronous machine is used with hydraulic turbines ? What is their operating speed range ?

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## 4.What are the advantages of brushless alternator ?

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## 5.Why should an alternator run always at synchronous speed ?

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## 6.State any four advantages of rotating field and stationary armature.

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## 7.What is the difference between degrees mechanical and degrees electrical. State the relation between them.

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## 8.Define a pole pitch.

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## 9.Define slot angle.

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## 10.State the various types of armature windings used in alternators.

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## 11.Define a coil span and a full pitch coil.

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## 12.What is the difference between concentrated and distributed winding. Which winding is preferred in alternator and why ?

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## 13.Why practically most of the alternators are connected in star ?

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## 14.Write the causes of harmonics in the voltage and current waves of electrical machinery ?

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## 15.Explain how quick stopping of a synchronous machine may be achieved.

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## 16.How is the armature windings in alternators different from those used in d.c. machines ?

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## 17.What are the methods of reducing the space harmonics in a machine ?

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## 18.Why the stator core is laminated ?

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## 19.What do you mean by single layer and double layer winding ?

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## 20.What are the various functions of damper winding provided with alternator ?

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## 21.What is integral slot winding and fractional slot winding ?

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## 22.Why alternators are rated in kVA and not in kW ?

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## 23.What is damper winding ?

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## 24.What are the essential elements for generating emf in alternators ?

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## 25.How many slip rings are generally required for an alternator ? Why ?

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## 26.State the relation between frequency, speed and poles for an alternator.

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## 27.For a 2 pole alternator, find the synchronous speed for a frequency of 50 Hz.

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## 28.What is synchronous speed of an alternator ?

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## 29.What is the difference between integral slot winding and fractional slot winding for an alternator ?

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## 30.State the advantages of fractional slot winding used in alternators.

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## 31.How can you distinguish between the two types of large synchronous generator from their appearance ?

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## 32.Distinguish between full-pitch coil and short-pitch coil.

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## 33.What are the advantages of salient pole type construction used for Synchronous machines.

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## 34.Define voltage regulation of alternator.

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## 35.What are the factors that contribute reduction in terminal voltage of a loaded alternator ?

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## 36.Define voltage regulation. Name two methods used to determine voltage regulation of alternators.

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## 37.List the three important parameters of an armature winding of an alternator.

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## 38.Define leakage flux. State its effect.

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## 39.Define armature reaction in an alternator.

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## 40.State the nature of armature reaction for the various types of load power factors.

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## 41.What data is required to calculate regulation by synchronous impedance method ?

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## 42.State the advantages and limitations of synchronous impedance method.

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## 43.For which two purposes m.m.f. is required for an alternator ?

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## 44.What is the use of Potier triangle ?

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## 45.Explain why an alternator with low value of short circuit ratio has lower limit of stability.

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## 46.State the assumption made in the Potier method and explain the effect of these assumptions on the accuracy of the voltage regulation.

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## 47.Why is the synchronous impedance method used to determine voltage regulation of synchronous machine called pessimistic ?

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## 48.Write down the causes for reduction in terminal voltage of alternator from it's no load value E₁ to V for a lagging power factor.

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## 49.What are the reasons for drop in voltage from no load to full load ?

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## 50.Under what condition the terminal voltage of an alternator will be greater than induced e.m.f. ?

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## 51.What are the experimental data required for Potier method ?

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## 52.What is the necessity for predetermination of voltage regulation ?

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## 53.Name the various methods for predetermining the voltage regulation of alternators.

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## 54.Distinguish between transient and sub-transient reactances.

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## 55.Two reaction theory is applied only to salient pole machines. State the reason.

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## 56.What is meant by alternator on infinite bus-bars ?

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## 57.What is the purpose of conducting slip test ?

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## 58.Define synchronization.

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## 59.What is meant by compounding curve in synchronous generator ?

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## 60.List the factors that affect the load sharing in parallel operating generators.

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## 61.Write down the conditions to be satisfied for proper synchronization of alternators.

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## 62.Specify the condition beyond which the synchronous machine is said to be out of step ?

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## 63.Explain what happens when the excitation of synchronous machine connected to an infinite bus is varied, the load torque remains constant.

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## 64.List out two advantages of synchronizing lamps used for synchronizing.

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## 65.State the characteristics of two alternators working in parallel.

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## 66.What are the conditions for parallel operation of alternators ?

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## 67.What is the need of parallel operation of alternators ?

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