A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

Electrical Machines
A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

½ ( ф + фᵢ ) in two adjacent quadrants and ½ ( ф - фᵢ ) in the remaining two quadrants

½ ( ф + фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in two diametrically opposite quadrants and ½ ( ф - фᵢ ) in the remaining two Quadrants

½ ( ф - фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in two adjacent quadrants and ½ ( ф - фᵢ ) in the remaining two quadrants

½ ( ф + фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in two diametrically opposite quadrants and ½ ( ф - фᵢ ) in the remaining two Quadrants

½ ( ф - фᵢ ) in all the four quadrants

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Electrical Machines
The principle of dynamically induced emf is utilized in

transformer.

choke.

thermocouple.

generator.

transformer.

choke.

thermocouple.

generator.

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Electrical Machines
Breadth factor is defined as the ratio of

emf with distributed winding to emf with concentrated winding.

None of these

both 1 and 2.

emf with concentrated winding to emf with distributed winding.

emf with distributed winding to emf with concentrated winding.

None of these

both 1 and 2.

emf with concentrated winding to emf with distributed winding.

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Electrical Machines
The compensating winding in a DC machine

is located on commutating poles for improving commutation.

is located on pole shoes to avoid the sparking at the brushes.

is located in armature slots for compensation of the armature reaction.

is located on pole shoes for avoiding the flashover at the commutator.

is located on commutating poles for improving commutation.

is located on pole shoes to avoid the sparking at the brushes.

is located in armature slots for compensation of the armature reaction.

is located on pole shoes for avoiding the flashover at the commutator.

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Electrical Machines
A compound motor has

tertiary winding.

only shunt field winding.

both shunt and series field winding.

only series field winding.

tertiary winding.

only shunt field winding.

both shunt and series field winding.

only series field winding.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Any where between 75 % and 90 %.

Less than 50 %

Around 90 %

Around 100 %.

Any where between 75 % and 90 %.

Less than 50 %

Around 90 %

Around 100 %.

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Electrical Machines

Electrical Machines A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

Electrical Machines The principle of dynamically induced emf is utilized in

Electrical Machines Breadth factor is defined as the ratio of

Electrical Machines The compensating winding in a DC machine

Electrical Machines A compound motor has

Electrical Machines In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines
A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

Electrical Machines
The principle of dynamically induced emf is utilized in

Electrical Machines
Breadth factor is defined as the ratio of

Electrical Machines
The compensating winding in a DC machine

Electrical Machines
A compound motor has

Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be