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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
 food processing
All of these
 computer printers

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 series motor
 comulatively compounded motor
 permanent magnet motor

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 500 W
 250 W
 400W
 300 W

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

None of these
 not changed
 increase
 decrease

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Electrical Machines
A single-winding single-phase motor has

 starting torque equal to full-load torque.
  zero starting torque.
 high starting torque.
 low starting torque.

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to half the applied voltage.
 Back emf is equal to zero.
 None of above.
 Back emf is equal to applied voltage.

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