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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 silicon steel.
 cast iron.
 fibre.

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Electrical Machines
For standing a DC motor a starter is required because

None of these
  it limits the speed of the motor.
  it limits the starting current to a safe value.
  It starts the motor.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

All of these
 Capacitor start motor
 Resistance split phase motor
 Capacitor start capacitor run motor

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Electrical Machines
Commutator in DC generator is used for

 increase efficiency
 convert AC armature current in to DC
 reduce losses
 collecting of current

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

 3000 rpm
 4000 rpm
 1000 rpm
 1500 rpm

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  sipper.
  thinner.
  rotor can not have any laminations.

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