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
The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except? Mark as favorite Copy Link armature reaction armature resistance drop field weakening due to armature reaction and armature commutation Check Answer
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be? Mark as favorite Copy Link demagnetisation only cross magnetisation as well as magnetisation cross magnetisation as well as demagnetising cross magnetisation only Check Answer
A D.C. generator can be considered as? Mark as favorite Copy Link rectifier prime mover rotating amplifier power pump Check Answer