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MID-SEMESTER TEST , SYLLABUS
Design of A C Machines(7Th Semester-
Electrical)
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[ subject code : 2170909]
(3)DESIGN OF SYNCHRONOUS
MACHINE:
Output equation and design of
main dimensions, Short Circuit Ratio (SCR) and its significance, Length of
air gap and shape of pole face.
ARMATURE DESIGN:
Armature winding (Single
layer and double layer), Number of armature slots, Slot dimensions, Length of
mean turn, Calculation of armature resistance and reactance.
DESIGN OF FIELD SYSTEM:
Design of magnetic circuit,
Open circuit characteristic, Determination of full load field MMF, Design of
field winding, Determination of direct and quadrature axis synchronous
reactance, Short circuit characteristics.
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Question bank (
7Th Semester- Electrical)
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Design of A C Machines[ subject code :
2170909]
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Three phase induction motor design
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1
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Derive an output equation for 3-ф induction
motor with usual notation.
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2
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Explain the points to be considered for the
selection of number of stator slots of a 3-phase induction motor.
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3
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Explain the factors that affect the choice
of specific magnetic & electric loading in case of a induction machine.
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4
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Discuss the effect of air gap length on the
performance of a 3-phase induction motor.
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5
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Discuss how the magnetizing current can be
estimated from the design data in a three phase induction motor.
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6
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Discuss the effect of variation of main
dimension(D&L) on performance (Rating, losses & efficiency) of 3-ф induction motor
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7
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Discuss the Harmonic torque in 3-ф induction motor
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8
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Prove that torque produce by 5TH
harmonics is in backward direction & 7TH harmonics is in
forward direction.
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9
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State the rules for the selection of rotor
slots. Describe the methods for reducing the effect of harmonics torque.
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10
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Explain the deciding factor for stator
slots and state the equation for 1) Area of stator slots 2) Stator winding
resistance 3) Stator copper losses
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11
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Explain the current distribution in the
bars and the end rings of a squirrel cage induction motor. Also derive the
relation for the current in the end ring.
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12
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Derive the equation of rotor resistance
referred to stator side, for a squirrel cage induction motor.
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13
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Explain the design procedure of rotor for3-ф
induction motor with usual notation.
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14
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Explain the design procedure of stator for3-ф
induction motor with usual notation.
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single phase induction motor design
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15
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Derive an output equation for 1-ф induction
motor with usual notation.
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16
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Explain the design procedure of rotor for1-ф
induction motor with usual notation.
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17
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Explain the design procedure of stator for1-ф
induction motor with usual notation.
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18
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Explain the design procedure of an
auxiliary winding in case of resistance split phase 1-ф induction motor with
usual notation.
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19
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Explain the design procedure of an
auxiliary winding in case of capacitor split phase 1-ф induction motor with
usual notation.
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20
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Explain the importance of circle diagram in
designing auxiliary winding for 1-ф induction motor.
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Synchronous machine design
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21
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Derive an output equation for 3-ф
Synchronous machines with usual notation.
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22
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Explain steps of design of field winding of
alternator.
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23
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Discuss the design differences of a salient
pole and non salient pole synchronous machines.
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24
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Explain the factors to be considered while
selecting number of armature slots in the design of a synchronous machine.
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25
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Explain the terms “critical speed” and “run
away speed” with reference to synchronous machine.
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26
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Define and explain the term “short circuit
ratio” of a synchronous generator and discuss its influences on the machine
performance.
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27
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Explain the design of armature resistance
& leakage reactance of alternator
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28
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What
is the role of damper winding in (i) synchronous generator and
(ii)synchronous motor? Derive the equation of MMF of damper winding.
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30
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Explain the factors that affect the choice
of specific magnetic & electric loading in case of a synchronous machine.
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31
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Write the steps and necessary equations for
rotor design of an synchronous machine
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32
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Explain the factors which are to be
considered while selecting the armature slots of a synchronous machine.
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33
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Explain steps of designing damper winding
of alternator.
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34
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Explain the harmonics effect & their
elimination efforts.
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35
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Explain different types of excitation
systems used for alternator.
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1
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Review of logic devices and
memories: Latches, Flip flops, Buffers,Controller
buffer registers, Decoders Memory Cell, Internal organization of Memory
Chips, Types of Memories Ram Rom PROM EPROM EEPROM, Flash Memory.
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2
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Microprocessor Based Systems: Digital Computer, Microprocessor, Microcomputer,
Microcontroller, Van Neumann and Harvard Architecture, CISC and RISC
Processors.
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3
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8085 Microprocessor: Architectural Block Diagram, Schematic and Pin diagrams,
Pin functions, Bus Organization, Internal operations and registers,
Externally initiated operations, Serial interrupt and I/O Control, Brief
Introduction of Instruction and assembly language Program, (Complete 8085
instruction set and Programming of assembly language 8085 should not be
covered & asked in the exam) Timing and Control Unit ,Microprocessor
communication, Multiplexing of address/data bus, Generation of control
signals, 8085 machine cycles,Fetch and execution of only MOV, STA, and OUT
instructions with timing diagram.
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4
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8051 Microcontroller architecture: Introduction to MCS -51 Family microcontrollers,
Architectural block Diagram, Pin diagram and Pin , Functions General Purpose and Special Function Registers, ,
Oscillator and clock circuit, Reset circuit, I/O Port circuits, Memory
organization, Internal program and data memory.
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5
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8051 Assembly language
programming: Programming model of 8051, Addressing
modes, data transfer instructions, I/O Port programming, Arithmetic and
Logical instructions, Bit level instructions, Branching instructions (Jump
and loop Jump and call), writing programs (like time delay using loop.),
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