10025 + "۱۳ ۵۱

MODULE - 5
Answer any one full question :

17. a) What are the losses of single phase transformer ? (4)

b) A single phase transformer has 400 and 1000 primary and secondary turns
respectively. The net cross sectional area of the core is 60 0072. If the primary
winding be connected to a 50Hz supply at 500V,

Calculate :
i) Peak value of flux density in the core and
ii) The voltage induced in the secondary winding. (6)
OR
18. a) Explain the working principle of a three phase Induction motor. (5)

0) Calculate the generated 6.10.1. in the armature winding of a 4 pole lap wound ೮೦
machine having 728 conductors running at 1800 rpm. The flux per pole is
30 mWb. (5)

MODULE - 6

Answer any one full question :

19. With aneat sketch explain pipe and plate earthing. (10)
OR
20. a) With a neat sketch explain the working of a single phase ELCB. (5)

b) Draw the schematic layout of a typical LT distribution board used in hous
wiring. ` ⋅ (5)