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Electrical Machines
The compensating winding in a DC machine
is located in armature slots for compensation of the armature reaction.
is located on pole shoes to avoid the sparking at the brushes.
is located on commutating poles for improving commutation.
is located on pole shoes for avoiding the flashover at the commutator.
is located in armature slots for compensation of the armature reaction.
is located on pole shoes to avoid the sparking at the brushes.
is located on commutating poles for improving commutation.
is located on pole shoes for avoiding the flashover at the commutator.
Answer
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Related Question
Electrical Machines
Series generators are used in which of the following applications?
All of these
Air crafts.
Used as boosters in dc distribution or transmission.
Arc welding.
All of these
Air crafts.
Used as boosters in dc distribution or transmission.
Arc welding.
Answer
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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with
heavy copper or aluminium bars placed in rotor slots.
heavy short-circuited end rings.
single phase winding.
three phase winding.
heavy copper or aluminium bars placed in rotor slots.
heavy short-circuited end rings.
single phase winding.
three phase winding.
Answer
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Electrical Machines
Which of the following methods are used to control the speed of DC motors is
field current control
armature circuit resistance control
supply voltage control
All of these
field current control
armature circuit resistance control
supply voltage control
All of these
Answer
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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?
DC series motor.
AC slip ring motor.
Synchronous motor.
Single phase induction motor.
DC series motor.
AC slip ring motor.
Synchronous motor.
Single phase induction motor.
Answer
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Electrical Machines
Synchronising power of a synchronous motor varies
directly as synchronous reactances Xs
inversely as 1/Xs
directly as Xs2
All of these
directly as synchronous reactances Xs
inversely as 1/Xs
directly as Xs2
All of these
Answer
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