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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 4000 rpm
 3000 rpm
 1000 rpm

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 increase and decrease respectively
 both decrease
 both increase
 decrease and increase respectively

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Electrical Machines
Skewing of cage rotors offers the following advantages

  locking tendency is reduced.
  all of below.
  less noise.
  uniform torque.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
  data provided is insufficient.
  4.
 6.

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Electrical Machines
Resistance commutation is used generally in case of

  fractional kW DC machines.
None of these
 DC machines above 10 kW.
 DC machines bellow 5 kW.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.
 none of above.
 back emf is equal to twice of applied voltage.

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