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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V
 applied voltage V
 V²
 1/V²

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Electrical Machines
Alternator operates on the principle of

  self induction.
  self or mutual induction.
  mutual induction.
  electromagnetic induction.

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 High voltage regulation
 Good voltage regulation
 Low short circuit current
None of these

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 zero
 40 V
 20 V
 50 V

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both armature current Ia and speed ωm increase
 Ia increases and ωm decreses
 Ia remains constant but ωm increase
 both decrese

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Electrical Machines
Stepper motor is used in

 traction
 computer printers
 food processing
All of these

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