Electrical Machines
Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is

 1, 2, 5
 1, 2, 6
 1, 4, 6
 1, 3, 5

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Electrical Machines
Two generators operating in parallel with rating 50MW and 100MW respectively. Both their respective governor settings are identical as 4%, consider same no load frequency. How will the machine share a common load of 100 MW

 66.67 MW and 33.33 MW respectively
 50 MW and 50 MW respectively
 any of the above
 33.33 MW and 66.67 MW respectively

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current fall.
 Back emf falls and line current increase.
  Back emf increase but line current falls.
 Both back emf as well as line current increase.

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