Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

None of these
 load test
 OC and SC tests
 back to back test

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

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

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 armature winding has thick leads whereas field winding has thin leads
 both the windings have thick leads
 armature winding has thin leads whereas field winding has thick leads
 both the windings have thin leads

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