Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 Ward Leonard control.
 rheostatic control.
 any of above method.
 none of above.

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 lap-wound machine will have more rated voltage and more current
 lap-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated current and more voltage
 wave-wound machine will have more rated voltage and less current

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 All of above.
 The accuracy in speed control is required.
 The speed in both the direction is required.
 Very fine speed control over the whole range from zero to normal speed is required.

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

  The motor will run at its normal speed in the same direction as before.
 The motor will stop.
 The direction of rotation will reverse.
 The motor will run much faster in the same direction.

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