15.
16.

17.

F
a) An iron ring of mean length 50cm has an air gap of Imm and a winding of 200 turns.
If the relative permeability of iron is 300 when a current of 1A flows through the coil,

find flux density. Take permeability of air as का x 10713൩. (5)
b) Compare magnetic circuit and electric circuit. (5)

a) Determine average value & rms value of symmetrical square wave also find the form

factor (6)
v
Vin
चत 277 cot
b) Distinguish between self inductance and mutual inductance (4)

Three identical resistors of 20൮ each are connected in star to 415V, 50Hz three phase
supply. Calculate (i) the total power consumed, (ii) total power consumed if they are
connected in delta (iii) total power consumed, if one of the resistors is opened in both star

connection and delta connections. (10)

With a neat schematic diagram explain Thermal power plant. (10)

Explain in detail the different equipment used in a substation. (10)
MODULE 5

Answer any one full question

The iron loss of 230/115V, SKVA transformer is 200W.The copper loss at full load is
250W. Find efficiency of the transformer when delivering

(i) full load power at unity power factor. (5)
(ii) half full load power at 0.8 pf lagging. (5)
OR

Explain with neat diagram the construction and working principle of three phase
induction motor. (10)