60) Which type of DC generator is used for welding generator set ?

61) How many parallel paths in simplex wave winding armature of the D.C. generator, which is having 8 poles ?

62) A pulley of DC generator is found to have completed 2000 revolutions within 1.25 minutes. The speed of the DC generator in r.p.m. will be :

63) The 10 pole D.C generator has 960 armature conductors and a flux per pole of 20 mwb running at 600 rpm. Calculate the e.m.f generated when the armature is connected in simplex wave winding ?

64) For DC machine which are subjected to severe working conditions, insulation test should be carried out at an interval of