Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms. 0.443. 0.573. 0.649. 0.512. 0.443. 0.573. 0.649. 0.512. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Crawling in an induction motor is due to time harmonics in supply. space harmonics produced by winding currents. slip ring rotor. insufficient starting torque. time harmonics in supply. space harmonics produced by winding currents. slip ring rotor. insufficient starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Counter emf of a DC motor regulates its armature voltage. exceeds supply voltage aids applied voltage. helps in energy conversion. regulates its armature voltage. exceeds supply voltage aids applied voltage. helps in energy conversion. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called crawling. slip. skewing. cogging. crawling. slip. skewing. cogging. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A generator may loose residual magnetism due to any of these. over excitation. heating. vibrations. any of these. over excitation. heating. vibrations. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator increases armature speed. results in sparking trouble. reduces inter poles flux density. reduces generator emf. increases armature speed. results in sparking trouble. reduces inter poles flux density. reduces generator emf. ANSWER DOWNLOAD EXAMIANS APP
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