MODEL - QU- Modeling and Analysis of Electrical Machines -Set1

P.S.R.ENGINEERING P.S.R.ENGINEERING COLLEGE, COLLEGE, SIVAKASI SIVAKASI -626 140 ELECTRICAL AND ELECTRONICS ENGINEERING ENGINEERING M.E DEGREE DEGREE EXAMINATIO EXAMINATION N M.E - POWER POWER ELECTRO ELECTRONICS NICS AND DRIVES DRIVES First Semester 12PE101 MODELING AND ANALYSIS OF ELECTRICAL MACHINES MACHINES Model Question Paper

Time: Three hours

Max. Marks: 100

Answer all Questions. Part: A (10 X 2 =20)

1. Show the the non linear magneti magnetization zation character characteristics istics of a doubly doubly excited system and and write the expression which relates energy and co-energy. 2. Define Define and and write write relation relation for stored magnetic magnetic energy. energy. 3. What What is meant meant by refer referenc encee frame frame theory theory?? 4. List the restrictio restrictions ns of the general generalized ized theory theory of machines machines.. 5. Write the voltag voltagee and torque equation equation of shunt shunt motor  6. What is meant meant by dynamic dynamic performance performance for for three phase phase fault fault in induction induction motor? motor? 7. Draw the equivale equivalent nt circuit circuit of three phase induction induction motor. motor. 8. Write the torque torque equation equation in reference reference frame frame variables variables.. 9. What What is is park park’s ’s transf transform ormatio ation? n? 10. Define Define critical critical time. time. Answer all Questions. Part Part:: B (5 X 16 =80) =80)

11. (a) Derive the expressio expression n for stored magnetic magnetic field field energy energy in a doubly doubly-excited -excited system. system. [16] OR  (b) Derive the expressions for mechanical work done and electromagnetic force in the case of a singly excited system. [16]

12. (a). Derive the expression for static and rotating reference frames.

[16]

OR  (b). Discuss the balanced steady state Phasor and voltage equations.

13. (a). (i). Obtain dynamic characteristics of permanent magnet dc motor. (ii). Write the solution of dynamic characteristics by Laplace transformation.

[16]

[8] [8]

OR  (b).Obtain the transient state voltage and torque equations of a D.C. shunt machine and also show the block diagram representation. [16]

14.(a). Derive the induction machine model in arbitrarily rotating reference frame.

[16]

OR  (b).Draw the arbitrary reference -frame equivalent circuits of a 3-phase, symmetrical induction machine using voltage equations in arbitrary reference –frame variables. [16]

15.(a). (i) Derive the voltage equations in arbitrary reference- frame for synchronous machine. (ii). Explain the term rotor angle and angle between rotor.

[8] [8]

OR  (b).Explain the dynamic performance for three phase fault in synchronous machine.

[16]