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

76.91 V.

66.91 V.

56.91 V.

86.91 V.

76.91 V.

66.91 V.

56.91 V.

86.91 V.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

I/Ia2

1/Ia

Ia2

Ia

I/Ia2

1/Ia

Ia2

Ia

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Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

1 and 3 are correct

1, 2 and 3 are correct

2 and 4 are correct

1, 2 and 4 are correct

1 and 3 are correct

1, 2 and 3 are correct

2 and 4 are correct

1, 2 and 4 are correct

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Electrical Machines
What is the effect of armature reaction ?

Both option B and C.

None of the options.

Armature flux weakens the main field flux.

Armature flux distorts the main field flux.

Both option B and C.

None of the options.

Armature flux weakens the main field flux.

Armature flux distorts the main field flux.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

Increasing the field current.

Decreasing the field current.

Increasing the armature current.

Increasing the field current.

Decreasing the field current.

Increasing the armature current.

Increasing the field current.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

0.87

0.95

1.06

0.96

0.87

0.95

1.06

0.96

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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 DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

Electrical Machines What is the effect of armature reaction ?

Electrical Machines In a DC Shunt Motor the speed can be increased by

Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

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 DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

Electrical Machines
What is the effect of armature reaction ?

Electrical Machines
In a DC Shunt Motor the speed can be increased by

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is