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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is
some what more than 230 V
some what less than 230 V
not possible
230 V
some what more than 230 V
some what less than 230 V
not possible
230 V
Answer
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Related Question
Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?
975 rpm
1000 rpm
940 rpm
950 rpm
975 rpm
1000 rpm
940 rpm
950 rpm
Answer
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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as
1.0.
2 to 3.
3 to 5.
1.5 to 2.
1.0.
2 to 3.
3 to 5.
1.5 to 2.
Answer
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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will
Open fuse or circuit breaker.
Produce sparking at brushes.
Draw too much current.
Develop excessive speed and damage itself.
Open fuse or circuit breaker.
Produce sparking at brushes.
Draw too much current.
Develop excessive speed and damage itself.
Answer
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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along
quadrature axis and interpolar axis
direct axis and interpolar axis
quadrature axis and direct axis
direct axis and indirect axis
quadrature axis and interpolar axis
direct axis and interpolar axis
quadrature axis and direct axis
direct axis and indirect axis
Answer
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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will
become execessively high.
decrease.
increase.
remain unaltered.
become execessively high.
decrease.
increase.
remain unaltered.
Answer
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