Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/3
 1/√5
 2/√5
 1/√2

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Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are

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

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Electrical Machines
An ideal synchronous motor has no starting torque because

 rotor is made up of salient poles.
 relative velocity between the stator and rotor mmf’s is zero.
 rotor winding is highly reactive.
  relative velocity between stator and rotor mmf’s is not zero.

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