In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

1, 3, 5

1, 2, 3, 4

2, 3, 4

1, 2, 5

1, 3, 5

1, 2, 3, 4

2, 3, 4

1, 2, 5

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

Cummulative compound.

have an equal number of electrons and protons.

Differentical compound.

Series shunt.

Cummulative compound.

have an equal number of electrons and protons.

Differentical compound.

Series shunt.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

950 rpm

975 rpm

940 rpm

1000 rpm

950 rpm

975 rpm

940 rpm

1000 rpm

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

Field control.

Multiple voltage control.

Ward-Leonard control.

Armature control.

Field control.

Multiple voltage control.

Ward-Leonard control.

Armature control.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

condition of paper insulation in transformer.

condition of oil in transformer.

condition of lamination on CRGO steel sheet.

condition of cork gaskets used in transformer.

condition of paper insulation in transformer.

condition of oil in transformer.

condition of lamination on CRGO steel sheet.

condition of cork gaskets used in transformer.

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Electrical Machines
Drop in speed from no load to full load is very high in

Series motor with interpoles.

Shunt motor with interpoles.

Series motor without interpoles.

Cummulative compound motor with interpoles.

Series motor with interpoles.

Shunt motor with interpoles.

Series motor without interpoles.

Cummulative compound motor with interpoles.

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Electrical Machines

Electrical Machines On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

Electrical Machines If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

Electrical Machines For very sensitive and wide speed control, the preferable control method is

Electrical Machines Fufuraldehyde analysis is done to determine the

Electrical Machines Drop in speed from no load to full load is very high in

Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

Electrical Machines
For very sensitive and wide speed control, the preferable control method is

Electrical Machines
Fufuraldehyde analysis is done to determine the

Electrical Machines
Drop in speed from no load to full load is very high in