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Electrical Machines
Which machine is used for battery charging?
Compounded DC generator.
None of these.
DC series generator.
DC shunt generator.
Compounded DC generator.
None of these.
DC series generator.
DC shunt generator.
Answer
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Related Question
Electrical Machines
Demagnetization effects which of the following?
commutation
both B and C
reduction in main field flux
reduces the terminal voltage
commutation
both B and C
reduction in main field flux
reduces the terminal voltage
Answer
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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by
Vt= Ea + Iara
Vt= Ea– Iara
Vt = Ea + Ia(ra + rs)
Vt = Ea + Iara+ ILrs
Vt= Ea + Iara
Vt= Ea– Iara
Vt = Ea + Ia(ra + rs)
Vt = Ea + Iara+ ILrs
Answer
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Electrical Machines
DC generator will not build up voltage
if it has lost residual magnetism.
due to wrong direction of rotation.
any one of above.
if field resistance is more than critical resistance.
if it has lost residual magnetism.
due to wrong direction of rotation.
any one of above.
if field resistance is more than critical resistance.
Answer
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Electrical Machines
Transformer cooling and insulating oil must be of
low BDV.
low viscosity.
low resistivity.
high viscosity.
low BDV.
low viscosity.
low resistivity.
high viscosity.
Answer
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Electrical Machines
In a DC machine, for the same value of Æ, Z and N; which one of the following statements is correct?
Armature emf is more with wave winding than with lap winding.
Armature emf is less with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Armature emf is less with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Answer
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