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

2, 3, 4

1, 3, 5

1, 2, 3, 4

1, 2, 5

2, 3, 4

1, 3, 5

1, 2, 3, 4

1, 2, 5

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

None of these.

Both of above.

Heavy sparking at brushes.

Heavy sparking at the first stud of starting resistance steps.

None of these.

Both of above.

Heavy sparking at brushes.

Heavy sparking at the first stud of starting resistance steps.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

Ward Leonard control.

Rheostatic control.

None of above.

Any of above method.

Ward Leonard control.

Rheostatic control.

None of above.

Any of above method.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Remain unchanged

None of above.

Increases.

Decreases.

Remain unchanged

None of above.

Increases.

Decreases.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

clearance between tips of the adjacent pole shoes.

all of above.

shape of the pole shoe.

size of air gap.

clearance between tips of the adjacent pole shoes.

all of above.

shape of the pole shoe.

size of air gap.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

No wave and lap winding.

Lap winding.

Both wave and lap winding.

Wave winding.

No wave and lap winding.

Lap winding.

Both wave and lap winding.

Wave winding.

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Electrical Machines

Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Electrical Machines In a DC generator the actual flux distribution depends upon

Electrical Machines For high current and low voltage rating which winding is employed to DC machine?

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Electrical Machines
In a DC generator the actual flux distribution depends upon

Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?