Electrical Machines A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings V/2, I and P/2 V, I and P V/2, I/2 and P/4 V, I/2 and P/2 V/2, I and P/2 V, I and P V/2, I/2 and P/4 V, I/2 and P/2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be 240 V 474 V 6 V 234 V 240 V 474 V 6 V 234 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The residual magnetism of a self-excited dc generator is lost. To build up its emf again the armature connection must be reversed the field winding connection must be reversed the field winding must be replaced field winding must be excited by low voltage dc supply the armature connection must be reversed the field winding connection must be reversed the field winding must be replaced field winding must be excited by low voltage dc supply ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Flux density under leading pole tips in case of generator will None of these either increase or decrease decrease increase None of these either increase or decrease decrease increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an auto-transformer, power is transferred through both A and B. None of these conduction process only. induction process only. both A and B. None of these conduction process only. induction process only. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Dynamic braking is very effective for separately excited motors. series motors. differential compound motors. shunt motors. separately excited motors. series motors. differential compound motors. shunt motors. ANSWER DOWNLOAD EXAMIANS APP
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