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.

56.91 V.

66.91 V.

76.91 V.

86.91 V.

56.91 V.

66.91 V.

76.91 V.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

150Hz.

50Hz.

200Hz.

100Hz.

150Hz.

50Hz.

200Hz.

100Hz.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

eddy electric current loss.

vibrations.

hysteresis loss.

copper loss.

eddy electric current loss.

vibrations.

hysteresis loss.

copper loss.

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Electrical Machines
Armature of DC machine is made of

conducting material.

silicon steel.

non-ferrous material.

insulating material.

conducting material.

silicon steel.

non-ferrous material.

insulating material.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

T ∝ 1/V²

T ∝ V

T ∝ 1/V

T∝ V²

T ∝ 1/V²

T ∝ V

T ∝ 1/V

T∝ V²

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

back emf is equal to applied voltage.

None of above.

Back emf is equal.

Back emf is equal to half of applied voltage.

back emf is equal to applied voltage.

None of above.

Back emf is equal.

Back emf is equal to half of applied voltage.

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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 A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

Electrical Machines The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

Electrical Machines Armature of DC machine is made of

Electrical Machines In a 3-phase induction motor, torque and supply voltage are related as

Electrical Machines When the mechanical power is developed by a DC motor maximum

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
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

Electrical Machines
Armature of DC machine is made of

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

Electrical Machines
When the mechanical power is developed by a DC motor maximum