Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Aromatics based insulating oil.
  Paraffin based insulating oil.
 Olefin based insulating oil.
 Naphtha based insulating oil.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

 increase to a value greater than 1.25 times 220 V
 increase to 1.25 times 220 V
 not change and remain at 220 V
 increase to value lying between 220 V and 1.25 times 220 V

ANSWER DOWNLOAD EXAMIANS APP