In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis when
the generator runs on designed speed
the generator runs on overload
the generator runs on full load
there is no load on|he generator
there is no load on|he generator
Lamination’s of core are generally made of
case iron
carbon
silicon steel
stainless steel
silicon steel
Which of the following could be lamina-proximately the thickness of lamination’s of a D.C. machine ?
0.5 mm
5 mm
0.05 mm
0.005 mm
0.5 mm
The bearings used to support the rotor shafts are generally
ball bearings
magnetic bearmgs
bush bearings
needle bearings
ball bearings
The armature of D.C. generator is laminated to
insulate the core
reduce eddy current loss
reduce the bulk
provide the bulk
reduce eddy current loss
The resistance of armature winding depends on
all of the above
length of conductor
cross-sectional area of the conductor
number of conductors
all of the above
The field coils of D.C. generator are usually made of
carbon
cast iron
mica
copper
copper
In a four-pole D.C. machine
all the four poles are north poles
all the four poles are south poles
alternate poles are north and south
two north poles follow two south poles
alternate poles are north and south
The commutator segments are connected to the armature conductors by means of
copper lugs
brazing
insulation pads
resistance wires
copper lugs
In a commutator
mica is harder than copper
mica and copper are equally hard
copper is harder than mica
none of the above
mica is harder than copper
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