Important Electrical Machine Design Multiple Choice Questions and Answers


16.  Flame proof motor are used in


   A. Moisture and dust free atmosphere

   B. Moisture free atmosphere

   C. Dust free atmosphere

   D. Explosive atmosphere


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D. Explosive atmosphere

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17.  The electric motor provided on refrigerators is usually


   A. Totally enclosed type

   B. Screen protected type

   C. Open type

   D. Protected type


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A. Totally enclosed type

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18.  The shafts of electric motors is generally supported in


   A. Cast iron bearings

   B. Brush bearings

   C. Magnetic bearings

   D. Ball or roller bearings


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D. Ball or roller bearings

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19.  Transformer oil should have


   A. High flash point

   B. High viscosity

   C. High sludging tendencies

   D. None of the above


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A. High flash point

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20.  Short time rating machines have usually


   A. Longer operating times and longer shut down times

   B. Longer operating times and shorter shut down times

   C. Low operating times and shorter shut down times

   D. Low operating times and longer shut down times


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D. Low operating times and longer shut down times

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