Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of cogging.
 reduce chance of crawling.
  reduce magnetizing current.
 increase starting torque.

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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

 The speed will increase in proportion to reduction in load.
 The speed will increase gradually.
 The speed will increase abruptly.
 The speed will remains almost constant.

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Electrical Machines
In a stepper motor the detente torque means

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

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