With increase in temperature, the electrical conductivity would
A). Increase in metals as well as in intrinsic semiconductor
B). Increase in metals but decrease in intrinsic semiconductor
C). Decrease in metals but increase in intrinsic semiconductor
D). Decrease in metals as well as in intrinsic semiconductor
The number of protons in a copper atom are
A). 2
B). 9
C). 11
D). 29
In over compounded generator, full load terminal voltage is
A). Almost zero
B). Less than no load terminal voltage
C). More than no load terminal voltage
D). Equal to no-load terminal voltage
To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them
A). just ahead of magnetic neutral axis
B). in magnetic neutral axis
C). just behind the magnetic neutral axis
D).
Which of the following generator will have negligible terminal voltage while running on no-load?
A). Series generator
B). Shunt generator
C). Compound generator
D). Separately excited generator