ELECTRICAL MACHINES-I 4th/2520/0952/ELECT/EEE/May 2016
Electrical Machines-I 4th Sem EEE May 2016 PSBTE Paper SECTION-A
Q1. Fill in the Blanks 15×1=15
- The magnitude of induced emf is directly proportional to rate of change of Flux.
- Under____ condition magnets do not move away from each Other.
- Direction of torque depends upon Axis Of Rotation of torque angle.
- DC series motor is used for vacuum cleaner, traction systems, sewing machines, cranes
- Interpoles are used for Reduces the effect of Armature Reaction in DC Machine.
- DC motor starter is used for Heavily starting current.
- Transformer is a Static machine
- Transformer core is made of silicon steel to reduce Eddy Current Losses.
- Condition for maximum efficiency is copper losses is equal to Iron Losses.
- Transformer steps up or steps down voltage .
SECTION-B
Q2. Attempt any five questions. 5×6=30
- What are advantages of three phase transformer over single phase transformer?
- Explain working of auto Transformer ?
- What is transformer? Explain its construction and working.
- Explain various losses in d.c Generator ?
- Name the main parts of c machine and explain their functions.
- Compare features of generator and Motor ?
SECTION-C
Q3. Attempt any three questions. 3×10=30
- Explain constructions of three phase Transfomer ?
- What are instrument transformers? Explain PT working Principle ?
- Explain various methods of speed control of c shunt motor. Explain any one.
- Explain concept of torque production in an electrical machine.
Section a:-ELECTRICAL MACHINES-I 4th/2520/0952/ELECT/EEE/May 2016
The magnitude of induced emf is directly proportional to rate of change of Flux.
Under ___ condition magnets do not move away from each Other.
Direction of torque depends upon Axis Of Rotation of torque angle.
DC series motor is used for vacuum cleaner, traction systems, sewing machines, cranes
Interpoles are used for Reduces the effect of Armature Reaction in DC Machine.
DC motor starter is used for Heavily starting current.
Transformer is a Static machine
Transformer core is made of silicon steel to reduce Eddy Current Losses.
Condition for maximum efficiency is copper losses is equal to Iron Losses.
Transformer steps up or steps down voltage
JK Engineering Classes Electrical Machines-1 4th Semester Solved Paper May 2016 Solution Click Here
Section B :ELECTRICAL MACHINES-I 4th/2520/0952/ELECT/EEE/May 2016
Advantages of three phase transformer over single phase transformer
Working of auto Transformer
What is transformer and its construction and working
Various losses in d.c Generator
Name the main parts of c machine
Comparison the features of generator and Motor
ELECTRICAL MACHINES-I Semester4th/2520/0952/ELECT/EEE/May 2016 Paper Click Here
Section c ELECTRICAL MACHINES-I 4th/2520/0952/ELECT/EEE/May 2016
Constructions of three phase Transfomer
instrument transformers
Explain PT working Principle
Methods of speed control of dc shunt motor
Concept of torque production in an electrical machine