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Electrical Machines
In DC generators brushes are used for
collecting of current without any sparkings
collecting of voltage
convert ac armature current in to dc
reduce eddy current loss
collecting of current without any sparkings
collecting of voltage
convert ac armature current in to dc
reduce eddy current loss
Answer
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Related Question
Electrical Machines
In a transformer which of the following losses are zero?
All of these
Rotational loss
Copper loss
Iron loss
All of these
Rotational loss
Copper loss
Iron loss
Answer
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Electrical Machines
Slip speed is the
sum of synchronous and rotor speeds.
difference of actual rotor speed and synchronous speed.
difference of synchronous speed and actual rotor speed.
half of the sum of synchronous and rotor speeds.
sum of synchronous and rotor speeds.
difference of actual rotor speed and synchronous speed.
difference of synchronous speed and actual rotor speed.
half of the sum of synchronous and rotor speeds.
Answer
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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by
rotor of an synchronous machine.
rotor of a dc machine.
stator of a dc machine.
stator of a induction machine.
rotor of an synchronous machine.
rotor of a dc machine.
stator of a dc machine.
stator of a induction machine.
Answer
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Electrical Machines
Which of the following is/are effects of armature reaction?
increases the design cost
All of these
increase the iron loss
increase the maintenance and repair
increases the design cost
All of these
increase the iron loss
increase the maintenance and repair
Answer
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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?
PZL/4Sa²
PZL/ 4Sa
PZL/4Sp²
PZL/4S
PZL/4Sa²
PZL/ 4Sa
PZL/4Sp²
PZL/4S
Answer
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