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

65) Which one of the following is the main reason for using compensating winding in a DC generator ?

66) The generators are designed to deliver full load current and the fall of no-load voltage will be about :