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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 0o.
 less than 90o.
 Greater than 90o.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero , - 50 rpm.
 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with distributed winding to emf with concentrated winding.
 both 1 and 2.
None of these
 emf with concentrated winding to emf with distributed winding.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  series connected.
  deferentially compounded.
 shunt connected.
  cumulatively compounded.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 both B and C
 over compound generator
 shunt generator
 series generators

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous generator
 3-phase synchronous motor
 reluctance motor
 hysteresis motor

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