WorksheetsQUIZ4-EMD
Total questions: 10
Worksheet time: 5mins
What is the usage of the tanks with tubes?
if the temperature rise with plain tank is very low
if the temperature rise with plain tank is very high
if the temperature rise is zero
if the temperature rise with plain tank exceeds the specific limits
What is the relation of the provision of tubes with respect to dissipation of heat?
the provision of tubes is directly proportional to the dissipation of heat
the provision of tubes is indirectly proportional to the dissipation of heat
the provision of tubes is directly proportional to square of the dissipation of heat
the provision of tubes is indirectly proportional to square of the dissipation of heat
What is the relation of the transformer surface with respect to dissipation of heat?
transformer surface has no relation with respect to dissipation of heat
transformer surface has minor changes with respect to dissipation of heat
transformer surface has major changes with respect to dissipation of heat
transformer surface has no change with respect to dissipation of heat
How is the circulation of oil improved in tanks with tubes?
it can be improved by using dissipating heat
it can be improved by using more effective air circulation
it can be improved by using more effect power flow
it can be improved by using more effective heads of pressure
An addition of 35 percent should be made to tube area of the transformers.
true
false
What is the loss dissipated by tubes by convection, given area of the tubes = 3.5?
12.3 W per °c
2.51 W per °c
5.3 W per °c
30.8 W per °c
What is the formula for temperature rise with tubes?
temperature rise with tubes = total loss / dissipating surface*(12.5 + 8.8x)
temperature rise with tubes = total loss * dissipating surface*(12.5 + 8.8x)
temperature rise with tubes = total loss / dissipating surface / (12.5 + 8.8x)
temperature rise with tubes = total loss + dissipating surface*(12.5 + 8.8x)
What is the formula for number of tubes?
number of tubes = (1/ 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface)
number of tubes = (1* 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface)
number of tubes = (1/ 8 * area of each tube) / (total loss / temperature rise with tubes – 12.5 * dissipating surface)
number of tubes = (1/ 8 * area of each tube) + (total loss / temperature rise with tubes – 12.5 * dissipating surface)
What is the range of the diameter of the tubes used?
50-60 mm
60-70 mm
70-80 mm
50-70 mm
What is the formula for width of the tank for single phase transformers used?
width of tank = 2*distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank
width of tank = distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank
width of tank = 2*distance between adjacent limbs * external diameter of h.v windings + 2*clearance between h.v windings and tank
width of tank = distance between adjacent limbs * external diameter of h.v windings + 2*clearance between h.v windings and tank
