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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 dependent upon the load.
 90o.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
  1.
 0.3.
  0.54.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
None of these
 static induced emf.
 both A and B.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 83.33 KVA
 50 KVA
 123.3 KVA

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Electrical Machines
Induction motors have the advantage of

  less maintenance.
  simple in construction.
  all of below.
  less cost.

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