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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 1000 rpm
 950 rpm
 940 rpm

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Terminal voltage is same
 Speed of alternators should be same
 Frequency should be same
 Both 1and 2

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
Which type of motors are preferred in lifts?

 DC series motors.
 DC compound motors.
 DC shunt motors.
None of these

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 a positive finite value
 ∞
 a finite negative value

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Stator resistance starting.
  Direct online starting.
  Auto transformer starting.
  Rotor resistance starting.

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