10. ‘Earthing is necessary’. Comment on the statement.

(10 x 4 = 40 Marks)
PART 8
Answer any 4 FULL questions each having 10 marks

11. Calculate the current through the galvanometer

(10)
~ । ~

2۷

12. A steel ring of 25cm diameter and of circular cross section ‏وہ3‎ in diameter has an air gap of
1.5mm length. It is wound uniformly with 750 tums of wire carrying a current of 2.1 A.
Calculate (1) m.m.f (ii) flux density in air gap (iii) magnetic flux (iv) relative permeability of
steel ring. Assume that iron path takes about 35% of total magnetomotive force. (10)

13. Determine the form factor of the saw tooth wave shown:

(10)
14. Explain how power is measured in a three phase system using two wattmeters. (10)
15. With a neat schematic diagram, explain a hydroelectric power generation plant. (10)
16. With a neat diagram,explain a typical power transmission scheme. (10)

www.ktustudents.in (4x10=40 Marks)