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
Capacitor in split phase induction motor is used to

reduce the harmonics.

improve the power factor.

start the motor.

improve the starting torque.

reduce the harmonics.

improve the power factor.

start the motor.

improve the starting torque.

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Electrical Machines
Stray losses in transformer occurs in

paper insulation in transformers.

transformer insulating oil.

winding conductors and steel structures of transformer.

steel core.

paper insulation in transformers.

transformer insulating oil.

winding conductors and steel structures of transformer.

steel core.

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Electrical Machines
A DC series motor has which of the following characteristics?

Has a almost constant speed.

Has its field winding consinting of thick wire and less no of turns.

Has a poor torque.

Can be started easily without load.

Has a almost constant speed.

Has its field winding consinting of thick wire and less no of turns.

Has a poor torque.

Can be started easily without load.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

None of these

increase.

decrease.

either of these.

None of these

increase.

decrease.

either of these.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

10

100

50

1

10

100

50

1

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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 Capacitor in split phase induction motor is used to

Electrical Machines Stray losses in transformer occurs in

Electrical Machines A DC series motor has which of the following characteristics?

Electrical Machines In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

Electrical Machines In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

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
Capacitor in split phase induction motor is used to

Electrical Machines
Stray losses in transformer occurs in

Electrical Machines
A DC series motor has which of the following characteristics?

Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch