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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 remains constant.
 decreases.
 increases.
 decreases

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 25 Hz
 0 Hz
 50 Hz

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 lie under south pole.
 there is no hard and fast rule for this.
 lie under north pole.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

None of these
 Slip ring induction motor.
 Same in both induction motors.
 Squirrel cage induction motor.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
 motor will not run.
 It will run in same direction.
  It will run in opposite direction.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 both armature current Ia and speed ωm increase
 Ia increases and ωm decreses
 both decrese

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MORE MCQ ON Electrical Machines

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