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.

76.91 V.

66.91 V.

86.91 V.

56.91 V.

76.91 V.

66.91 V.

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Electrical Machines
For larger units high torque it is preferred to use

Partial motor.

Universal motor.

Slip induction motor.

DC shunt motor.

Partial motor.

Universal motor.

Slip induction motor.

DC shunt motor.

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Electrical Machines
Alternator operates on the principle of

self or mutual induction.

electromagnetic induction.

mutual induction.

self induction.

self or mutual induction.

electromagnetic induction.

mutual induction.

self induction.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5ÃŽÂ© and back back emf 200 V is

44 A.

400 A.

440 A.

40 A.

44 A.

400 A.

440 A.

40 A.

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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

1 and 3

2, 3 and 4

1, 2, and 3

1, 2 and 4

1 and 3

2, 3 and 4

1, 2, and 3

1, 2 and 4

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Electrical Machines
A 3 - ÃŽÂ¦, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 ÃŽÂ© rotor resistance and 0.3 ÃŽÂ© standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

0.78 ÃŽÂ©.

0.66 ÃŽÂ©.

0.24 ÃŽÂ©.

0.45 ÃŽÂ©.

0.78 ÃŽÂ©.

0.66 ÃŽÂ©.

0.24 ÃŽÂ©.

0.45 ÃŽÂ©.

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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 For larger units high torque it is preferred to use

Electrical Machines Alternator operates on the principle of

Electrical Machines The current drawn by a 220 V DC series motor of armature resistance 0.5ÃŽÂ© and back back emf 200 V is

Electrical Machines A 3 - ÃŽÂ¦, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 ÃŽÂ© rotor resistance and 0.3 ÃŽÂ© standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

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
For larger units high torque it is preferred to use

Electrical Machines
Alternator operates on the principle of

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5ÃŽÂ© and back back emf 200 V is

Electrical Machines
A 3 - ÃŽÂ¦, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 ÃŽÂ© rotor resistance and 0.3 ÃŽÂ© standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required