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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is
All of these
zero
maximum
minimum
All of these
zero
maximum
minimum
Answer
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Related Question
Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to
I/Ia2
Ia2
Ia
1/Ia
I/Ia2
Ia2
Ia
1/Ia
Answer
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Electrical Machines
Which of the following DC generators has rising V-I characteristics?
Series.
Shunt.
None of them.
Compound.
Series.
Shunt.
None of them.
Compound.
Answer
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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings
V/2, I/2 and P/4
V, I/2 and P/2
V, I and P
V/2, I and P/2
V/2, I/2 and P/4
V, I/2 and P/2
V, I and P
V/2, I and P/2
Answer
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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,
A is bigger than B for the same voltage rating
A is bigger than B for the same current rating
both are of the same size for the same current rating
B is bigger than A for the same current rating
A is bigger than B for the same voltage rating
A is bigger than B for the same current rating
both are of the same size for the same current rating
B is bigger than A for the same current rating
Answer
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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will
deteriorate with rise in terminal voltage.
improve with rise in terminal voltage.
deteriorate with fall of terminal voltage.
improve with fall of terminal voltage.
deteriorate with rise in terminal voltage.
improve with rise in terminal voltage.
deteriorate with fall of terminal voltage.
improve with fall of terminal voltage.
Answer
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