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For the following questions answer them individually
In DC machine shape of main field flux distribution is
triangular
flat tapped or trapezoidal
saddle shape
peaky in nature
A generating voltmeter uses ____.
a constant speed motor
a variable speed motor
a variable speed motor with a capacitor
one of these
Dummycoils are used for
increasing efficiency
reducing armature reaction
mechanical balancing
All options are correct
Brushes in a DC machine are normally placed electrically in the
polar regions
inter polar regions
either of these
None of these
For a dc machine shuntresistance and armature resistance values are
high and high
high and low
low and low
low and high
The useofhigherflux density in the transformer design
reduces the weigh per KVA
increases the weigh per KVA
has no relation with the weight of transformer
The coreflux in transformer depends mainly on
Supply voltage
Supply voltage , Frequency and Load
Supply voltage and Load
Supply voltage and Frequency
$$I^{2}R$$ losses or Ohmic Losses are also known as
Copper Losses
Iron Losses
Eddy Current Losses
Hysteresis Losses
The rotor shaft of an induction motor is made of
high speed steel
soft steel
carbon steel
iron
If numberof poles in the rotor decrease the speed ofthe rotor will
Decreases
become zero
damage the rotor bar
increases
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