Electrical Machines Sparkless commutation can be achieved by employing compensating winding. high resistance carbon brushes. inter poles. any one or more of the above methods. compensating winding. high resistance carbon brushes. inter poles. any one or more of the above methods. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then both decrese Ia increases and ωm decreses both armature current Ia and speed ωm increase Ia remains constant but ωm increase both decrese Ia increases and ωm decreses both armature current Ia and speed ωm increase Ia remains constant but ωm increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by f / s. s2. sf. sf / 2. f / s. s2. sf. sf / 2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The wound rotor type IM is used for____________ speed operation. maximum. constant. variable. minimum. maximum. constant. variable. minimum. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When operating, two or more transformers in parallel, % impedance of these transformers should be same. proportionate to MVA rating of transformers. inversely proportional to MVA rating of transformers. such that actual impedance of all transformers would be same. same. proportionate to MVA rating of transformers. inversely proportional to MVA rating of transformers. such that actual impedance of all transformers would be same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC Shunt Motor the speed can be increased by Increasing the field current. Increasing the armature current. Decreasing the field current. Increasing the field current. Increasing the field current. Increasing the armature current. Decreasing the field current. Increasing the field current. ANSWER DOWNLOAD EXAMIANS APP
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