Electrical Machines
The overall power factor of an on load transformer

 is always leading.
  depends on the power factor of the load.
 is always unity.
 is always lagging.

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Electrical Machines
The synchronous reactance( Xs) is the

 reactance either due to armature reaction or leakage flux
 combined reactance due to armature reaction and leakage flux
 reactance due to leakage flux
 reactance due to armature reaction of the machine

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Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

 2, 3, 4
 2, 3, 4, 5
 1, 2, 3, 4 and 5
 1, 3, 4, 5

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Electrical Machines
In a DC machine

 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.
 current and emf in armature are alternating.
 current and emf in armature are unidirectional

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