Important Electrical Machine Design Multiple Choice Questions and Answers

21.  A machine is specified as 100 KW maximum 10 continuous rating. The machine

   A. Cannot be overloaded

   B.Can be overloaded by 10% only

   C. Can be overloaded by 20% only

   D. Can be overloaded by 25% for 2 hours only

22.  Short time rating machines have usual ..........operating time and ............shut down time

   A. Longer, longer

   B. Smaller, smaller

   C. Smaller, longer

   D. Longer, smaller

23.  The output of a rotating electrical machine is limited bye

   A. Peripheral velocity

   B. Temperature rise

   C. Size of machine

   D. Efficiency of the machine

24.  Power transformers have rating

   A. Equal to 50 kVA

   B.Equal to 100 kVA

   C. Above 200 KVA

   D. None of the above

25.  Power transformers should be designed to have maximum efficiency

   A. At one forth load

   B. At one half load

   C. At or near full load

   D. Any of the above

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