For large power transformers, self oil cooled type or air blast type – McqOptions

MCQOPTIONS

1.	For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
A.	1.0 to 1.2 A/mm2
B.	1.5 to 2.0 A/mm2
C.	2.2 to 3.2 A/mm2
D.	3.2 to 4.2 A/mm2
Answer» D. 3.2 to 4.2 A/mm2

Discussion

No Comment Found

Related MCQs

<p> Dummy coil should not be used in_________________?</p>
<p> Which of the following methods is most accurate ?</p>
<p> electromagnets generally function as holding magnets ?</p>
<p> cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?</p>
<p> In D.C. machines the width of the duct is usually_____________?</p>
<p> For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?</p>
<p> The weight of copper of both armature and field windings decreases with __________ in number of poles?</p>
<p> The thermal conductivity of hydrogen is _____________ times that of air?</p>
<p> A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?</p>
<p> Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?</p>