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Electrical Machines

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

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

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Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
 8 pole.
  2 pole.
 6 pole.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 570 A.
  460 A.
  340 A.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
 1800 Watt.
 1920 Watt.
  980 Watt.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 proportional to square of rotor speed.
 constant independent of speed.
 zero.

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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

 83.33 KVA
 50 KVA
 123.3 KVA
 100 KVA

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