Electrical Machines The slight curvature at the lower end of the OCC of a self excited DC generator is due to magnetic inertia. high speed. high field resistance. residual flux. magnetic inertia. high speed. high field resistance. residual flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is 2 and 3 1 alone 1 and 2 1 and 3 2 and 3 1 alone 1 and 2 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The field divertor resistance for a DC series motor is of order of 100 Ω 10 Ω 0.1 Ω 50 Ω 100 Ω 10 Ω 0.1 Ω 50 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the starting resistance in the starter. None of these stator phases of the motor. rotor at slip rings. starting resistance in the starter. None of these stator phases of the motor. rotor at slip rings. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator? Dummy coils. Commutator. Equalizer rings. Eye bolt. Dummy coils. Commutator. Equalizer rings. Eye bolt. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will remain unaltered. become execessively high. increase. decrease. remain unaltered. become execessively high. increase. decrease. ANSWER DOWNLOAD EXAMIANS APP
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