Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Series Motor
 DC Shunt Motor
 Separately Excited DC Motor
 Compound Wound DC Motor

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Electrical Machines
The synchronous reactance( Xs) is the

 combined reactance due to armature reaction and leakage flux
 reactance either due to armature reaction or leakage flux
 reactance due to leakage flux
 reactance due to armature reaction of the machine

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Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,

 1, 2 and 4 are correct
 1 and 4 are correct
 1, 2 and 3 are correct
 2, 3 and 4 are correct

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