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Electrical Machines

Electrical Machines
In DC machines shape of net flux density is?

 peaky in nature
 saddle shape
 flat tapped or trapezoidal
 sine wave

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum voltage.
 the voltage generated will be zero.
 field winding will burn.
 machine will generate maximum power.

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Electrical Machines
Armature reaction depends on which of the following?

None of these
 magnitude of load current
 both 1 and 2
 power factor of load

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 develop excessive speed and damage itself.
 open fuse or circuit breaker.
 draw too much current.
 produce sparking at brushes.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are connected.
  Armature and field both are in series with the load.
 Armature and field both are parallel.
 Armature winding is in series with load.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 450 rpm.
 540 rpm.
  240 rpm.
  470 rpm.

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MORE MCQ ON Electrical Machines

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