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Electrical Machines
The mechanical power is developed by a DC motor is maximum when
back emf is equal to applied voltage.
back emf is equal to twice of applied voltage.
none of above.
back emf is equal to half of applied voltage.
back emf is equal to applied voltage.
back emf is equal to twice of applied voltage.
none of above.
back emf is equal to half of applied voltage.
Answer
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Related Question
Electrical Machines
In a DC Shunt Motor the speed can be increased by
Increasing the field current.
Increasing the armature current.
Increasing the field current.
Decreasing the field current.
Increasing the field current.
Increasing the armature current.
Increasing the field current.
Decreasing the field current.
Answer
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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?
(1-K) × input power
both A and B
None of these
K × input power
(1-K) × input power
both A and B
None of these
K × input power
Answer
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Electrical Machines
Hunting in a synchronous cannot be due to
variable supply voltage.
windage friction.
variable frequency.
variable load.
variable supply voltage.
windage friction.
variable frequency.
variable load.
Answer
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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in
13 HP.
15 HP.
14 HP.
10 HP.
13 HP.
15 HP.
14 HP.
10 HP.
Answer
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Electrical Machines
The direction of rotation of a DC motor can be determined by
Fleming's left hand rule.
Lenz's law.
Fleming's right hand rule.
Ampere's law.
Fleming's left hand rule.
Lenz's law.
Fleming's right hand rule.
Ampere's law.
Answer
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