9627-UNIVERSAL COLLEGE OF ENGINEERING & TECHNOLOGY
9627-UNIVERSAL COLLEGE OF ENGINEERING & TECHNOLOGY
Vallioor
B.E., Fifth semester
Internal Assessment Test II
Vallioor
B.E., Fifth semester
Internal Assessment Test II
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
(EE 8301 ELECTRICAL MACHINES-I)
Time: 1.30 Hours.
Maximum: 50 marks
(EE 8301 ELECTRICAL MACHINES-I)
Time: 1.30 Hours.
Maximum: 50 marks
Answer ALL questions
Part – A – (6x2= 12)
Answer ALL questions
Part – A – (6x2= 12)
1.Describe multiply excited magnetic field systems
2.What is the significance of co-energy ?
3.What is the significance of winding factor ?
4.Why do all practical energy conversion devices make use of the magnetic
field as a coupling medium rather than electric field ?
5.Write the applications of singly and doubly fed magnetic systems ?
6.What is meant by pole pitch and chording angle ?
1.Describe multiply excited magnetic field systems
2.What is the significance of co-energy ?
3.What is the significance of winding factor ?
4.Why do all practical energy conversion devices make use of the magnetic
field as a coupling medium rather than electric field ?
5.Write the applications of singly and doubly fed magnetic systems ?
6.What is meant by pole pitch and chording angle ?
Part – B – (2x12= 24)
Part – B – (2x12= 24)
7A) Explain in detail doubly excited magnetic system
(12)
OR
7B) Derive the torque equation of round rotor machine or AC Machine (12)
8A) Explain in detail about singly excited magnetic system (12)
OR
8B)With a neat diagrams explain the mmf space wave of one phase of three
phase distributed winding in a 2 pole machine and derive the expression for the
fundamental mmf wave of the distributed winding in it
(12)
𝟏
𝟏
𝟑𝒙
𝟑𝒙
9) a) Two coupled coils have aself and mutal inductances 𝑳𝟏𝟏 =3+ ; 𝑳𝟐𝟐 =1+
Part-C (1x14=14)
𝟏
𝟏
𝟑𝒙
𝟑𝒙
9) a) Two coupled coils have aself and mutal inductances 𝑳𝟏𝟏 =3+ ; 𝑳𝟐𝟐 =1+
𝟏
7A) Explain in detail doubly excited magnetic system
(12)
OR
7B) Derive the torque equation of round rotor machine or AC Machine (12)
8A) Explain in detail about singly excited magnetic system (12)
OR
8B)With a neat diagrams explain the mmf space wave of one phase of three
phase distributed winding in a 2 pole machine and derive the expression for the
fundamental mmf wave of the distributed winding in it
(12)
Part-C (1x14=14)
; 𝑳𝟐𝟏 =𝑳𝟏𝟐 = .Over a certain range of displacement x.The first coil is excited by a
𝟑𝒙
current of 10 A and second coil by a constant current of -5A.Find the mechanical
work done if the x changes from 0.5 to 1 and the energy supplied by each electrical
sources.
9)b) Derive the torque developed in doubly excited magnetic system.
𝟏
; 𝑳𝟐𝟏 =𝑳𝟏𝟐 = .Over a certain range of displacement x.The first coil is excited by a
𝟑𝒙
current of 10 A and second coil by a constant current of -5A.Find the mechanical
work done if the x changes from 0.5 to 1 and the energy supplied by each electrical
sources.
9)b) Derive the torque developed in doubly excited magnetic system.