Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of oil in transformer.
 condition of cork gaskets used in transformer.
  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at synchronous speed with respect to rotor.
  rotates at the speed of rotor in the air gap.
  rotates at slip speed with respect to stator mmf.
  is at standstill with respect to stator mmf.

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will rise.
  worsen and terminal voltage will fall
 improve but terminal voltage will fall.
  improve and terminal voltage will rise .

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