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WorksheetsMachines
Total questions: 10
Worksheet time: 9mins
Thin laminations are used in a machine in order to reduce
Hysteresis losses
Copper losses
Iron losses
Eddy current losses
The emf induced in the dc generator armature winding is
AC and DC
DC
AC
None of the above
Commutator in DC generator is used for
collecting of current
reduce losses
increase efficiency
convert AC armature current in to DC
In DC machine yoke offers
mechanical protection to the machine
flux path completion
produce working flux
both A and B
In DC generators brushes are used for
collecting of voltage
collecting of current without any sparkings
reduce eddy current loss
convert ac armature current in to dc
In a dc machine 4 pole lap winding is used. The number of parallel paths are?
2
8
1
4
In a dc machine 6 pole wave winding is used. The number of parallel paths are?
6
4
2
1
In DC machine torque depends on which of the following?
flux (φ)
armature current
speed
Both A and B
Maximum power will be developed when back emf is
equal to supply voltage.
half of the supply voltage
double the supply voltage.
all of the above.
Transformation Ratio K=
N2/N1
V1/V2
I2/I1
M1/M2
