EE6401-Electrical Machines-1-Important Question April/May 2018

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EE6401-Electrical Machines-1-Important Question April/May 2018

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Important Question 13 Marks

Unit- I

  1. Explain the losses in the Magnetic Materials and how these losses can be minimized.
  2. Discuss the AC operation of Magnetic Circuits.
  3. Compare electric and Magnetic circuit.
  4. Briefly explain about statically & dynamically induced emf.

Unit –II

  1. Derive the emf equation of a transformer.
  2. Draw the phasor diagram of transformer on different load conditions
  3. Predetermine the efficiency of transformer by SC and OC test.
  4. Explain in detail step by step procedure to draw the equivalent circuit of transformer
  5. Explain the working of autotransformer, Also derive the expression for the volume of copper of an autotransformer

Unit – III

  1. Explain the concept of doubly excited magnetic system
  2. Explain the concept of rotating Magnetic field
  3. Derive an expression for torque developed in round rotor machine.
  4. Explain the mmf space wave of a phase of distributed winding.

Unit – IV

  1. Derive the emf equation of a DC Generator.
  2. Explain armature Reaction in DC Generators and methods to reduce armature reaction
  3. Explain the Methods of excitation and characteristics of DC Generators.

Unit – V

  1. Explain the methods of speed control of DC Shunt Motor
  2. Need for starter, Explain the working of 3 point starter
  3. Derive the torque equation of a DC Motor
  4. Explain Swinburne’s test to predetermine the efficiency of a DC Machine.
  5. Explain Hopkinson’s test for determining the efficiency of two similar DC shunt Machine

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