Electrical Machines The sparking at the the brushes, in a DC machines is due to armature reaction. presence of commutator. reactance voltage. high resistance of carbon brushes. armature reaction. presence of commutator. reactance voltage. high resistance of carbon brushes. 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 A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf? 10V 100V 20V 200V 10V 100V 20V 200V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The shaft of induction motor may be unbalanced due to uneven air gap. poor lubrication. overheating of winding. overload. uneven air gap. poor lubrication. overheating of winding. overload. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The interpoles in dc machines have a tapering shape in order to economise on the material required for interpoles and their windings increase the acceleration of commutation reduce the overall weight reduce the saturation in the interpole economise on the material required for interpoles and their windings increase the acceleration of commutation reduce the overall weight reduce the saturation in the interpole ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A motor operates in stable region at which of the following slip? low slip region unity slip both 1 and 2 high slip region low slip region unity slip both 1 and 2 high slip region ANSWER DOWNLOAD EXAMIANS APP
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