Iron losses in a D.C. machine are independent of variations in? Mark as favorite Copy Link speed load voltage speed and voltage Check Answer
In D.C. generators the pole shoes are fastened to the pole core by? Mark as favorite Copy Link rivets counter sunk screws brazing welding Check Answer
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be? Mark as favorite Copy Link 4 8 16 32 Check Answer
The bearings used to support the rotor shafts are generally? Mark as favorite Copy Link ball bearings bush bearings magnetic bearings needle bearings Check Answer
The insulating material used between the commutator segments is normally? Mark as favorite Copy Link graphite paper mica insulating varnish Check Answer
In a D.C. generator. If p be the number of poles and N be the r.p.m, of rotor, then the frequency of magnetic reversals will be? Mark as favorite Copy Link Np/2 Np/60 Np/120 Np/3000 Check Answer
The purpose of providing dummy coils in a generator is? Mark as favorite Copy Link to enhance flux density to amplify voltage to provide mechanical balance for the rotor to reduce eddy currents Check Answer
Which of the following generating machine will offer constant voltage on all loads? Mark as favorite Copy Link Self-excited generator Separately excited generator Level compounded generator All of the above Check Answer
In D.C. generators, the brushes on commutator remain in contact with conductors which? Mark as favorite Copy Link lie under south pole lie under north pole lie under interpolar region are farthest from the poles Check Answer
The essential condition for parallel operation of two D.C. generators is that they have? Mark as favorite Copy Link same kW rating the same operation r.p.m. the same drooping voltage characteristics same percentage regulation Check Answer