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For the following questions answer them individually
In dc machine iron losses cause
heating in core
loss in efficiency
rise in temperature of ventilating air
all of the mentioned
Armature current at starting can be reduced by keeping
$$R_f$$ maximum and $$R_a$$ minimum
$$R_f$$ maximum and $$R_a$$ maximum
$$R_f$$ minimum and $$R_a$$ minimum
$$R_f$$ minimum and $$R_a$$ maximum
In dc motors, under leading pole tips flux density will
increase
decrease
either increase or decrease
None of these
The field winding will be drawn at what degree?
60 degree
30 degree
90 degree
180 degree
Compensating winding is placed in the
pole shoe
armature core
main field
all option are correct
stepped cores are used in transformers in order to reduce
volumeofiron
volume of copper
iron loss
reluctance of core
In a transformer the resistance betweenits primary and secondary is
zero
1 ohm
1000 ohms
infinite
In a transformer zero voltage regulation is achieved at a load power factor which is
leading
lagging
Unity
In the induction motors the torque is directly proportional to the
slip 1/3
higher slip values
Voltage Slip
lower slip values
In induction motor If we remove one phasefor instance, two terminals will have 'Y' phase and one will have 'B' phasecalled
AC dynamic Braking
plugging
cascade breaking
increasing motor torque
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