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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?
230 V.
210 V
150 V.
240 V.
230 V.
210 V
150 V.
240 V.
Answer
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Related Question
Electrical Machines
Which of the following motor is more expensive for same KW output rating ?
Synchronous motor.
Induction motor.
DC Shunt Motor
AC single phase motor.
Synchronous motor.
Induction motor.
DC Shunt Motor
AC single phase motor.
Answer
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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for
development of torque.
generation of voltage.
electromechanical energy conversion.
commutation.
development of torque.
generation of voltage.
electromechanical energy conversion.
commutation.
Answer
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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are
1, 4,5
1 , 3, 5
2, 3, 5
2, 4, 5
1, 4,5
1 , 3, 5
2, 3, 5
2, 4, 5
Answer
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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing
open circuit and zero power factor tests.
open circuit and short circuit tests.
zero power factor and slip tests.
short circuit and slip tests.
open circuit and zero power factor tests.
open circuit and short circuit tests.
zero power factor and slip tests.
short circuit and slip tests.
Answer
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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?
It will be doubled.
It will becomes four times.
It will remain the same.
It will be halved.
It will be doubled.
It will becomes four times.
It will remain the same.
It will be halved.
Answer
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