| Question bank ( 7Th Semester- Electrical) | |
| Design of A C Machines[ subject code : 2170909] | |
| 1 | Derive an output equation for 3-ф induction motor with usual notation. |
| 2 | Explain the points to be considered for the selection of number of stator slots of an 3-phase induction motor. |
| 3 | Explain the factors that effects the choice of specific magnetic & electric loading in case of a induction machine. |
| 4 | Discuss the effect of air gap length on the performance of a 3-phase induction motor. |
| 5 | Discuss how the magnetizing current can be estimated from the design data in a three phase induction motor. |
| 6 | Discuss the effect of variation of main dimension(D&L) on performance (Rating, losses & efficiency) of 3-ф induction motor |
| 7 | Discuss the Harmonic torque in 3-ф induction motor |
| 8 | Prove that torque produce by 5TH harmonics is in backward direction & 7TH harmonics is in forward direction. |
| 9 | State the rules for the selection of rotor slots. Describe the methods for reducing the effect of harmonics torque. |
| 10 | 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 |
| 11 | Explain steps of design of field winding of alternator. |
| 12 | |
| 13 | Explain importance of damper winding in synchronous machine. |
| 14 | Explain the terms “critical speed” and “run away speed” with reference to synchronous machine. |
| 15 | Define and explain the term “short circuit ratio” of a synchronous generator and discuss its influences on the machine performance. |
| 16 | Explain the effect of skewing the rotor slots in a squirrel cage induction motor. |
| 17 | What is the role of damper winding in (i) synchronous generator and (ii)synchronous motor? Derive the equation of MMF of damper winding. |
| 18 | Explain the factors that effects the choice of specific magnetic & electric loading in case of a synchronous machine. |
| 19 | Write the steps and necessary equations for rotor design of an synchronous machine |
| 20 | Explain the factors which are to be considered while selecting the armature slots of a synchronous machine. |
| 21 | Explain briefly the methods for improving e.m.f. wave form of an alternator. |
| 22 | Discuss in steps the design of field winding of a salient pole synchronous machine. |
| 23 | Discuss the design differences of a salient pole and non salient pole synchronous machines. |
| 24 | Explain the factors to be considered while selecting number of armature slots in the design of a synchronous machine. |
| 25 | Explain the design of salient pole rotor in a synchronous machine. |
QUESTION BANK FOR MID-1
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Unit No:
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Content
|
1
|
Supply
Systems: Electric supply system,
Typical AC power supply Scheme, Comparison of DC and AC transmission,
Advantages of high transmission voltage, Various system of power
transmission, Comparison of conductor material in overhead system, Comparison
of conductor material in underground system, Comparison of various systems of
transmission, Elements of a transmission line, Economics of power
transmission, Economical choice of conductor size, Economic choice of
transmission voltage, Requirement of satisfactory electric supply.
|
2
|
Mechanical
Design of Transmission Lines: Main
components of over head lines, Conductor materials, Line supports,
insulators, Types of insulators, Potential distribution over suspension
insulators, String efficiency, Methods of improving string efficiency,
|
3
|
Inductance
and Resistance of Transmission Line: Introduction,
Definition of Inductance, Flux Linkages of an isolated current carrying
conductor, Inductance of a single phase two wire line, Conductor types, Flux
Linkages of one conductor in group, Inductance of composite conductor lines,
Inductance of three phase lines, Double circuit three phase lines, Bundled
conductors, Resistance, Skin effect and Proximity effect, Magnetic field
induction.
|
4
|
Capacitance
of Transmission Lines: Introduction,Electric
field of a long straight conductor, Potential difference between two
conductors of a group of parallel conductors, Capacitance of a two wire line,
Capacitance of a three phase line with equilateral spacing, Capacitance of a
three phase line with unsymmetrical spacing, Effect of earth on transmission
line capacitance, Method of GMD, Bundled conductors, Electrostatic induction.
|
5
|
DC
and AC distribution : Distribution
system, classification of Distribution systems, AC distribution, DC
distribution, Connection scheme Types
of DC distributors, DC distribution calculations, DC distributor fed at one
end, uniformly loaded distributor fed at one end, distributor fed at both
ends, Distributor with both concentrated and uniform loading, Ring
distributor, Ring main distributors with interconnector,
|
6
|
Representation
of power system component: Introduction, Single phase Representation of
balanced three phase networks, The one line diagram and impedance or
reactance diagram, Per unit system, Advantages of pu system, Per unit
representation of a transformer, Per unit impedance diagram of a power
system, Complex power,
|
Unit No:
|
Content
|
1
|
Supply
Systems: Electric supply system,
Typical AC power supply Scheme, Comparison of DC and AC transmission,
Advantages of high transmission voltage, Various system of power
transmission, Comparison of conductor material in overhead system, Comparison
of conductor material in underground system, Comparison of various systems of
transmission, Elements of a transmission line, Economics of power
transmission, Economical choice of conductor size, Economic choice of
transmission voltage, Requirement of satisfactory electric supply.
|
2
|
Mechanical
Design of Transmission Lines: Main
components of over head lines, Conductor materials, Line supports,
insulators, Types of insulators, Potential distribution over suspension
insulators, String efficiency, Methods of improving string efficiency,
|
3
|
Inductance
and Resistance of Transmission Line: Introduction,
Definition of Inductance, Flux Linkages of an isolated current carrying
conductor, Inductance of a single phase two wire line, Conductor types, Flux
Linkages of one conductor in group, Inductance of composite conductor lines,
Inductance of three phase lines, Double circuit three phase lines, Bundled
conductors, Resistance, Skin effect and Proximity effect, Magnetic field
induction.
|
4
|
Capacitance
of Transmission Lines: Introduction,Electric
field of a long straight conductor, Potential difference between two
conductors of a group of parallel conductors, Capacitance of a two wire line,
Capacitance of a three phase line with equilateral spacing, Capacitance of a
three phase line with unsymmetrical spacing, Effect of earth on transmission
line capacitance, Method of GMD, Bundled conductors, Electrostatic induction.
|
5
|
DC
and AC distribution : Distribution
system, classification of Distribution systems, AC distribution, DC
distribution, Connection scheme Types
of DC distributors, DC distribution calculations, DC distributor fed at one
end, uniformly loaded distributor fed at one end, distributor fed at both
ends, Distributor with both concentrated and uniform loading, Ring
distributor, Ring main distributors with interconnector,
|
6
|
Representation
of power system component: Introduction, Single phase Representation of
balanced three phase networks, The one line diagram and impedance or
reactance diagram, Per unit system, Advantages of pu system, Per unit
representation of a transformer, Per unit impedance diagram of a power
system, Complex power,
|
