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Electrical Machines
If starter is not used with large DC motor for starting, it will
draw a starting current many times its rated full load current.
damage the armature and commutator.
provide execessive voltage drop in line.
all of above.
draw a starting current many times its rated full load current.
damage the armature and commutator.
provide execessive voltage drop in line.
all of above.
Answer
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Related Question
Electrical Machines
The use of higher flux density in the transformer design
increases the weigh per KVA
has no relation with the weight of transformer
reduces the weigh per KVA
None of these
increases the weigh per KVA
has no relation with the weight of transformer
reduces the weigh per KVA
None of these
Answer
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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?
AC single phase motor.
Synchronous motor.
DC Shunt Motor
Induction motor.
AC single phase motor.
Synchronous motor.
DC Shunt Motor
Induction motor.
Answer
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Electrical Machines
In escalator which motor is used?
DC shunt motor.
3 - φ IM.
Universal motor.
1 - φ IM.
DC shunt motor.
3 - φ IM.
Universal motor.
1 - φ IM.
Answer
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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting
negative sequence currents are generated.
the damper bars develop induction motor torque.
the damper bars develop synchronous motor torque.
the damper bars develop induction generator torque.
negative sequence currents are generated.
the damper bars develop induction motor torque.
the damper bars develop synchronous motor torque.
the damper bars develop induction generator torque.
Answer
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Electrical Machines
Direction of rotation of DC motor is reversed by
Interchanging armature and field connection.
Reversing armature connection or field connection.
Adding resistance to field circuit.
Reversing supply connection.
Interchanging armature and field connection.
Reversing armature connection or field connection.
Adding resistance to field circuit.
Reversing supply connection.
Answer
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