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

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Electrical Machines
In a stepper motor the detente torque means

  minimum of the static torque with the phase winding unexcited.
  maximum of the static torque with the phase winding excited.
  minimum of the static torque with the phase winding excited.
  maximum of the static torque with the phase winding unexcited.

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Electrical Machines
Which of the following statements is/are correct statements?

 EMF per turn in HV winding is more than EMF per turn in LV winding
 EMF per turn in both the windings are equal
All of these
 EMF per turn in HV winding is less than EMF per turn in LV winding

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Electrical Machines
Commutation in a DC machine may be explained as a process

 by virtue of which emf is induced in the armature conductors.
  in which magnetic field is set up.
 how alternate flux affects the main field flux.
  by which electric current in a coil is reversed.

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