10.a. An auxiliary motor is driving a synchronous alternator to determine its efficiency. When the test is made without field excitation, the data sheet shows the motor input to be 65 kw and the motor losses to be 30 kw. The friction and windage losses of the alternator are A. 30 kw. B. 35 kw. C. 65 kw. D. 95 kw. 10.b. In a d-c machine, which one of the following losses is a no-load loss? A. Ventilating loss B. Stray-load loss C. I²R loss D. Core 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.
10.a. An auxiliary motor is driving a synchronous alternator to determine its efficiency. When the test is made
without field excitation, the data sheet shows the motor input to be 65 kw and the motor losses to be 30
kw. The friction and windage losses of the alternator are
A. 30 kw.
B. 35 kw.
C. 65 kw.
D. 95 kw.
10.b. In a d-c machine, which one of the following losses is a no-load loss?
A. Ventilating loss
B. Stray-load loss
C. I²R loss
D. Core loss
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