Electrical Machines In DC generators, the cause of rapid brush wear may be severe sparking. any of above. imperfect contact. rough commutator surface. severe sparking. any of above. imperfect contact. rough commutator surface. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is 36.36% increase 18.18% increase 36.36% decrease 36.36% increase 36.36% increase 18.18% increase 36.36% decrease 36.36% increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator? same frequency same phase sequence same prime mover speed same voltage magnitude same frequency same phase sequence same prime mover speed same voltage magnitude ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Eg (generated emf) and Eb (back emf) both are changes. none of above. same. different. changes. none of above. same. different. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for hoisting and lowering which type of motor is preferred? AC slip ring motor. Synchronous motor. DC series motor. Single phase induction motor. AC slip ring motor. Synchronous motor. DC series motor. Single phase induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Wave winding is prefered for which of the following rating? low current and low voltage high current and low voltage high current and high voltage low current and high voltage low current and low voltage high current and low voltage high current and high voltage low current and high voltage ANSWER DOWNLOAD EXAMIANS APP
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