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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, 6
1, 2, 5
1, 3, 5
1, 4, 6
1, 2, 6
1, 2, 5
1, 3, 5
1, 4, 6
Answer
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Related Question
Electrical Machines
Dynamic braking is employed to brake
reversing drive
non reversing drive
both 1 and 2
None of these
reversing drive
non reversing drive
both 1 and 2
None of these
Answer
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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by
any of above methods.
providing damper winding in the rotor pole faces.
designing the motor for adequate synchronizing power.
using a flywheel.
any of above methods.
providing damper winding in the rotor pole faces.
designing the motor for adequate synchronizing power.
using a flywheel.
Answer
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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by
KefKf2Bm2.
Kef2Kf2Bm.
Kef2Kf2Bm2.
Kef2KfBm2.
KefKf2Bm2.
Kef2Kf2Bm.
Kef2Kf2Bm2.
Kef2KfBm2.
Answer
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Electrical Machines
Transformer core is laminated to reduce
hysteresis loss.
both 1 and 2.
copper loss.
eddy current loss.
hysteresis loss.
both 1 and 2.
copper loss.
eddy current loss.
Answer
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Electrical Machines
The armature shaft must be able to withstand
twisting strains due to transmission of torque.
bending moment due to weight of the armature.
any unbalanced magnetic pull on the armature core.
All of these
twisting strains due to transmission of torque.
bending moment due to weight of the armature.
any unbalanced magnetic pull on the armature core.
All of these
Answer
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