A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

86.91 V.

76.91 V.

66.91 V.

56.91 V.

86.91 V.

76.91 V.

66.91 V.

56.91 V.

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Electrical Machines
DC series motor is best suited for electric traction as

It is cheaper in cost.

It develops high starting torque.

It runs at very high speed at light load.

It consume less power.

It is cheaper in cost.

It develops high starting torque.

It runs at very high speed at light load.

It consume less power.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

PZL/4S

PZL/4Sp²

PZL/4Sa²

PZL/ 4Sa

PZL/4S

PZL/4Sp²

PZL/4Sa²

PZL/ 4Sa

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

Closed slot type machines.

Semi closed slot type machine.

Open slot type machines.

Any of the above.

Closed slot type machines.

Semi closed slot type machine.

Open slot type machines.

Any of the above.

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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.

27.73 Nm .

74 Nm.

38.5 Nm.

65.8 Nm.

27.73 Nm .

74 Nm.

38.5 Nm.

65.8 Nm.

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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 less than 90°

shift forward by 90°

coincide with the GNA

shift forward by more than 90°

shift forward by less than 90°

shift forward by 90°

coincide with the GNA

shift forward by more than 90°

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Electrical Machines

Electrical Machines A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

Electrical Machines DC series motor is best suited for electric traction as

Electrical Machines For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

Electrical Machines Which of the following machines have highest power factor with respect to magnetizing current?

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 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
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

Electrical Machines
DC series motor is best suited for electric traction as

Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

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
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