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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
Eddy current loss will depends on

 Flux density
All of these
 Frequency
 Thickness

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Electrical Machines
Transformer oil is used as

 an insulator.
 a coolant.
 both A and B.
 inert medium.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

  460 A.
 570 A.
 250 A.
  340 A.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous generator.
 induction motor.
  induction generator.
 synchronous motor.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

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

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