The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

14.28 and 9.60 ÃŽÂ©.

8.248 and 5.54 ÃŽÂ©.

8.248 and 9.60 ÃŽÂ©.

14.28 and 5.54 ÃŽÂ©.

14.28 and 9.60 ÃŽÂ©.

8.248 and 5.54 ÃŽÂ©.

8.248 and 9.60 ÃŽÂ©.

14.28 and 5.54 ÃŽÂ©.

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

both are of the same size for the same current rating

A is bigger than B for the same current rating

A is bigger than B for the same voltage rating

B is bigger than A for the same current rating

both are of the same size for the same current rating

A is bigger than B for the same current rating

A is bigger than B for the same voltage rating

B is bigger than A for the same current rating

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

to reduce eddy current loss.

to reduce hysteresis loss.

to reduce mechanical losses.

to provide better flux linkage.

to reduce eddy current loss.

to reduce hysteresis loss.

to reduce mechanical losses.

to provide better flux linkage.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

Eb is unchanged, but Td is zero

both Eb and Td are unchanged

Eb is zero, but Td is unchanged

both Eb and Td are zero

Eb is unchanged, but Td is zero

both Eb and Td are unchanged

Eb is zero, but Td is unchanged

both Eb and Td are zero

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

44.47 Amp.

33.33 Amp.

43 Amp.

29 Amp.

44.47 Amp.

33.33 Amp.

43 Amp.

29 Amp.

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Electrical Machines
Eddy current loss will depends on

Frequency

Flux density

Thickness

All of these

Frequency

Flux density

Thickness

All of these

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Electrical Machines

Electrical Machines The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines The armature core of the rotor bars of dc motors are laminated

Electrical Machines The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

Electrical Machines A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines Eddy current loss will depends on

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines
The armature core of the rotor bars of dc motors are laminated

Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines
Eddy current loss will depends on