Download PTU M.Tech. EE 2nd Semester 71358 MODELING AND DYNAMICS OF ELECTRICAL MACHINES Question Paper

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Total No. of Questions : 08

Total No. of Pages : 02

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M.Tech.(EE) (2013 Batch) (Sem.-2)

MODELING AND DYNAMICS OF ELECTRICAL MACHINES

Subject Code : MTEE-203

M.Code: 71358

Time: 3 Hrs.

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Max. Marks : 100

INSTRUCTION TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

1. 1. What is generalized machine theory? What are the restrictions of generalized machine theory?

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   2. Obtain the transfer function of a D.C. separately excited machine. Neglect only frictional torque and also write the formulae for undamped natural angular frequency and damping factor.
2. 1. Develop machine model for a D.C. compound machine, with the help of neat schematic diagram and primitive diagram. Arrange the final equations in state space form.
   2. For a voltage-fed synchronous motor develop the relevant voltages in state variable form.

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3. 1. What do you understand by the term 'Linear Transformation' as used in electrical machines?
   2. Obtain the expressions for a 3-phase induction motor (Voltage and current) in state variable form in:
      1. Stator reference frame
      2. Synchronously rotating frame.

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4. 1. Derive and obtain expressions for flux linkages in the two-axis model for a 3-phase induction motor from a and ß and 0 values.
   2. Discuss linearized and non-linearized analysis of induction machine?
5. 1. Derive torque equation for a 3-phase synchronous motor model and obtain steady state power angle characteristics based on its torque expression.
   2. Explain phase transformation and Active transformation used in a.c. machines.

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6. 1. Derive the circuit model of a 3-phase synchronous motor and mention few salient features from its model.
   2. Derive expressions for armature to field mutual inductances and armature self- inductances for a salient-pole synchronous machine. How are these inductance expressions modified for a cylindrical rotor synchronous machine?
7. A 3-phase, 50Hz cylindrical rotor synchronous machine has the following parameters : Self-inductance for phase 'a' = 3.15 mH. Armature leakage inductance = 0.35 mH. For this machine, calculate the mutual inductance between armature phases and its synchronous reactance.

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8. Write notes on the followings :
   1. Transient stability of synchronous machines
   2. Basic challenges in computer simulations
   3. Circuit oriented simulator Pspice
   4. Surge voltage transients in transformers.

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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