Answer any one FULL question having 10 marks

17. With neat sketch give the construction details of a DC machine? (10)

OR
18. a) A single phase transformer has a core whose cross-sectional area is 150 cm’, operates at a
maximum flux density of 1.1Wb/m? from a 50Hz supply. If the secondary winding has 66
turns, determine the output KVA when connected to a load of 462 impedance. Neglect any
voltage drop in transformer. ൪)
b) The power input to a 230V 60 shunt motor is 8.477kW. The field resistance is 230 and

armature resistance is 0.28Q. Find input current, armature current and back emf. (5)

Answer any one FULL question having 10 marks

19. a) Discuss the different tariff scheme employed for LT and HT consumers.

(5)
(5)

b) With neat diagram, explain pipe earthing in electrical installation.
OR

20. Discuss the difference between ELCB and MCB with neat diagram. (10)