In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

shift forward by more than 90°

coincide with the GNA

shift forward by 90°

shift forward by less than 90°

shift forward by more than 90°

coincide with the GNA

shift forward by 90°

shift forward by less than 90°

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Electrical Machines
Width of a carbon brush should be equal to

less than the width of commutator segment.

the width of the 1 to 2 commutator segment.

the width more than 3 commutator segment.

the width of the 2 to 3 commutator segment.

less than the width of commutator segment.

the width of the 1 to 2 commutator segment.

the width more than 3 commutator segment.

the width of the 2 to 3 commutator segment.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these

delta or star according to need.

star.

delta.

None of these

delta or star according to need.

star.

delta.

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Electrical Machines
Which of the following statements is/are correct ?

Compensating winding will act under the pole.

Both A and B.

None of these

Inter pole winding will act in interpolar region.

Compensating winding will act under the pole.

Both A and B.

None of these

Inter pole winding will act in interpolar region.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

65.8 Nm.

27.73 Nm .

38.5 Nm.

74 Nm.

65.8 Nm.

27.73 Nm .

38.5 Nm.

74 Nm.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

0.2

0.02

0.04

0.4

0.2

0.02

0.04

0.4

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Electrical Machines

Electrical Machines In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines Width of a carbon brush should be equal to

Electrical Machines The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

Electrical Machines Which of the following statements is/are correct ?

Electrical Machines When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

Electrical Machines A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
Width of a carbon brush should be equal to

Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

Electrical Machines
Which of the following statements is/are correct ?

Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?