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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 4KVA
 0KVA
 20KVA

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Avoid sparking.
 Limit the flux.
 Limit the current.
  Limit the speed.

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Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 fibre.
 silicon steel.
 cast iron.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 iron made tank of transformer.
 steel core in transformer.
 winding of transformer.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  1500 rpm.
  3000 rpm.
  4000 rpm.
  3600 rpm.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Delta - star
 Delta - delta
 Star - star

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