Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 123.3 KVA
 100 KVA
 83.33 KVA

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 A is bigger than B for the same current rating
 both are of the same size for the same current rating
 A is bigger than B for the same voltage rating
 B is bigger than A for the same current rating

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