15.a. A d-c machine has an armature current of 16 amp. If the machine uses metal graphite brushes with shunts, the brush-contact I 2R loss for one brush is A. 8 watts. B. 24 watts. C. 16 watts. D. 4 watts. 15.b. A load test for a transformer is run primarily to determine its A. efficiency. B. copper loss. C. temperature rise. D. resistance loss.
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
15.a. A d-c machine has an armature current of 16 amp. If the machine uses metal graphite brushes with
shunts, the brush-contact I
2R loss for one brush is
A. 8 watts.
B. 24 watts.
C. 16 watts.
D. 4 watts.
15.b. A load test for a transformer is run primarily to determine its
A. efficiency.
B. copper loss.
C. temperature rise.
D. resistance loss.
According to the question we have to find
Loss for one brush with the help of given data
And
Use of load test of transformer.
Step by step
Solved in 2 steps with 1 images
