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12. a) Compare electric and magnetic circuit. (6)
b) A coil of insulated wire 500 turns and of resistance 4Q is closely wound on iron ring.
The ring has a mean diameter of 0.25m and a uniform cross sectional area of 700mm‘.

Calculate the total flux in the ring when a de supply of 6V is applied to the end of the

winding. Assume a relative permeability of 550. (4)
13. a)State and explain Faraday’s laws and Lenz’s law. (5)
b) Find the average and rms values for the given wave form. (5)
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4
ha. 2 3 wt

14. With neat phasor diagram, explain how power 15 measured in a 3 phase system by using 2

wattmeters. (10)

15. With a neat layout explain thermal power plant .Also list 4 advantages and disadvantages
of hydel power plant. (10)

16. | With the help ofa single line diagram explain a typical power transmission system. (10)
MODULE 5
Answer any one full question

17. a) With neat diagram explain the construction of a de generator. (5)

b) Maximum efficiency of a transformer occurs at unity power factor and at full load. If

the full load copper loss is 60 W, calculate the total loss at full load, 5 ்‌ and = fall
load? (5)

OR

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