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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
1/Ia
I/Ia2
Ia2
Ia
1/Ia
I/Ia2
Ia2
Ia
Answer
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Related Question
Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for
commutation
generation of voltage
electromechanical energy conversion
development of torque
commutation
generation of voltage
electromechanical energy conversion
development of torque
Answer
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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is
2.73 KW.
5.46 KW.
1.644 KW.
0.9103 KW.
2.73 KW.
5.46 KW.
1.644 KW.
0.9103 KW.
Answer
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Electrical Machines
Ideal value of voltage regulation of a device is?
∞
0
a finite negative value
a positive finite value
∞
0
a finite negative value
a positive finite value
Answer
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Electrical Machines
Slip exists in
synchronous motor.
in both machines.
none of above.
induction motor.
synchronous motor.
in both machines.
none of above.
induction motor.
Answer
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Electrical Machines
Armature reaction in a DC machine
is in the same direction as the main poles.
is in direct opposition to the main poles.
makes an angle with the main pole axis which is load dependent.
makes an angle of 90° with the main pole axis.
is in the same direction as the main poles.
is in direct opposition to the main poles.
makes an angle with the main pole axis which is load dependent.
makes an angle of 90° with the main pole axis.
Answer
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