Important Electrical Machine Design Multiple Choice Questions and Answers

46.  Which of the following methods is used to for air cooling of turbo alternators ?

   A. One-sided axial ventilation

   B. Two sided axial ventilation

   C. Multiple inlate system

   D. All of the above

47.  On which off the following variables heat convected depends ?

   A. Power density

   B. Temperature difference between heated surface and coolant

   C. Thermal resistivity,density, specific heat

   D. All of the above

48.  In direct cooled system using hydrogen both stater and rotor conductors are made

   A. Solid

   B. Hollow

   C. Perforated

   D. Any of the above

49.  By which of the following methods motor rating for therapy load drives can be determined?

   A. Method of average losses

   B. Equivalent current method

   C. equivalent torque method

   D. All of the above

50.  Which off the following methods is most accurate ?

   A. Equivalent current method

   B. Equivalent power method

   C.Equivalent torture method

   D. Method of average losses

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