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. 0.649. 0.573. 0.512. 0.443. 0.649. 0.573. 0.512. 0.443. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Due to magnetic saturation, the flux per pole in a DC machine without brush shift decreases in generators and increases in motor with load. increases in both the generators and the motors with load. decreases in both generators and the motors with load. increases in generators but decreases in motor with load. decreases in generators and increases in motor with load. increases in both the generators and the motors with load. decreases in both generators and the motors with load. increases in generators but decreases in motor with load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For pure resistive load what is the armature reaction? magnetization All of these demagnetization cross magnetization magnetization All of these demagnetization cross magnetization ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction effect is more in which of the following methods? same in both methods None of these armature resistance control field weakening method same in both methods None of these armature resistance control field weakening method ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On what factors the speed of dc motor depends? Field flux. Applied voltage. Armature current Ia. All of these. Field flux. Applied voltage. Armature current Ia. All of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following are variable losses? eddy current loss hysteresis loss shunt field copper loss armature copper loss eddy current loss hysteresis loss shunt field copper loss armature copper loss ANSWER DOWNLOAD EXAMIANS APP
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