The armature of D.C. generator is laminated to? Mark as favorite Copy Link reduce the bulk provide the bulk insulate the core reduce eddy current loss Check Answer
ln a commutator? Mark as favorite Copy Link copper is harder than mica mica and copper are equally hard mica is harder than copper none of the above Check Answer
The commutator segments are connected to the armature conductors by means of? Mark as favorite Copy Link copper lugs resistance wires insulation pads brazing Check Answer
ln a four-pole D.C. machine? Mark as favorite Copy Link all the four poles are north poles alternate poles are north and south all the four poles are south poles two north poles follow two south poles Check Answer
Requirement of speed at which machine is driven is? Mark as favorite Copy Link more critical in the case of altenators more critical in the case of D.C. generators equally critical in the case of alternators as well as D.C. generators none Check Answer
Fleming’s right-band rule regarding direction of induced e.m.f., correlates? Mark as favorite Copy Link magnetic flux, direction of current flow and resultant force magnetic flux, direction of motion and the direction of e.m.f. induced magnetic field strength, induced voltage and current magnetic flux, direction of force and direction of motion of conductor Check Answer
To avoid formation of grooves in the commutator of a D.C. machine? Mark as favorite Copy Link the brushes of opposite polarity should track each other the brushes of same polarity should track each other brush position has no effect on the commutator grooving none Check Answer
For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f.? Mark as favorite Copy Link Lap winding Wave winding Either of (a) and (b) above Depends on other features of design Check Answer
In case of D.C. machines, mechanical losses are primary function of? Mark as favorite Copy Link current voltage speed none of above Check Answer
In a lap wound D.C. generator having p as number of poles and Z as number of conductors, the maximum number of equilizer rings will be? Mark as favorite Copy Link Z p 2Z/p 2p/Z Check Answer