In a D.C. machine stray loss is the sum of? Mark as favorite Copy Link total copper loss and mechanical loss armature copper loss and iron loss shunt field copper loss and mechanical loss iron loss and mechanical loss Check Answer
Which generator cannot start if there is no residual magnetism? Mark as favorite Copy Link Series generator Shunt generator Separately excited generator All of the above Check Answer
Shunt generators are most suited for stable parallel operation because of their? Mark as favorite Copy Link rising voltage characteristics identical voltage characteristics drooping voltage characteristics linear voltage characteristics Check Answer
Eddy currents are induced in the pole shoes of a D.C machine due to? Mark as favorite Copy Link oscillating magnetic field pulsating magnetic flux relative rotation between field and armature all above Check Answer
In a D.C. generator the actual flux distribution depends upon? Mark as favorite Copy Link size of air gap shape of the pole shoe clearance between tips of the adjacent pole shoes all of the above Check Answer
A cumulatively compounded long shunt generator when operating as a motor would be? Mark as favorite Copy Link cumulatively compounded long shunt differentially compounded long shunt cumulatively compounded short shunt differentially compounded short shunt Check Answer
In a D.C. machine, short-circuited field coil will result in? Mark as favorite Copy Link odour of burning insulation unbalanced magnetic pull producing vibrations reduction of generated :voltage for which excitation has to be increased to maintain the voltage all above Check Answer
Compensating windings are used in DC generators? Mark as favorite Copy Link mainly to reduce the eddy currents by providing local short-circuits to provide path for the circulation of cooling air to neutralise the cross-magnetising effect of the armature reaction none of the above Check Answer
The following constitute short-circuit in the armature winding? Mark as favorite Copy Link Insulation failure between two commutator bars Insulation failure between two turns of a coil Two of more turns of the same coil getting grounded All of the above Check Answer
Welding generator will have? Mark as favorite Copy Link lap winding wave winding delta winding duplex wave winding Check Answer