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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is
cross – magnetizing.
magnetizing.
ineffective.
demagnetizing.
cross – magnetizing.
magnetizing.
ineffective.
demagnetizing.
Answer
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Related Question
Electrical Machines
The speed regulation of a DC motor is given as
NnL − NfL.
(NfL − NnL)/NnL.
NnL/NfL.
(NnL − NfL)/NfL.
NnL − NfL.
(NfL − NnL)/NnL.
NnL/NfL.
(NnL − NfL)/NfL.
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.
using a flywheel.
designing the motor for adequate synchronizing power.
any of above methods.
providing damper winding in the rotor pole faces.
using a flywheel.
designing the motor for adequate synchronizing power.
Answer
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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the
motor will become slow.
armature current will drop
motor will attain dangerously high speed
armature will oscillate about original speed as the mean speed
motor will become slow.
armature current will drop
motor will attain dangerously high speed
armature will oscillate about original speed as the mean speed
Answer
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Electrical Machines
In most condition which frame of motor will be preferred?
Splash proof.
Totally enclosed fan coiled.
Open type.
Drip proof.
Splash proof.
Totally enclosed fan coiled.
Open type.
Drip proof.
Answer
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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?
None of above.
Increases.
Decreases.
Remain unchanged
None of above.
Increases.
Decreases.
Remain unchanged
Answer
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