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

½ ( ф - фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in all the four quadrants

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

400 V.

480 V.

420 V.

350 V.

400 V.

480 V.

420 V.

350 V.

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Electrical Machines
Direction of rotation of DC motor is reversed by

Reversing supply connection.

Adding resistance to field circuit.

Reversing armature connection or field connection.

Interchanging armature and field connection.

Reversing supply connection.

Adding resistance to field circuit.

Reversing armature connection or field connection.

Interchanging armature and field connection.

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Electrical Machines
An induction motor is, in general analogous to

two winding transformer with secondary open circuited.

auto transformer.

None of these

two winding transformer with secondary short circuited.

two winding transformer with secondary open circuited.

auto transformer.

None of these

two winding transformer with secondary short circuited.

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

changes to 0.5 times the original value

remain the same as the original

changes to three times the original value

changes to 1.5 times the original value

changes to 0.5 times the original value

remain the same as the original

changes to three times the original value

changes to 1.5 times the original value

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Electrical Machines
In DC generators brushes are used for

convert ac armature current in to dc

collecting of current without any sparkings

reduce eddy current loss

collecting of voltage

convert ac armature current in to dc

collecting of current without any sparkings

reduce eddy current loss

collecting of voltage

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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 For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

Electrical Machines Direction of rotation of DC motor is reversed by

Electrical Machines An induction motor is, in general analogous to

Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

Electrical Machines In DC generators brushes are used for

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
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

Electrical Machines
Direction of rotation of DC motor is reversed by

Electrical Machines
An induction motor is, in general analogous to

Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

Electrical Machines
In DC generators brushes are used for