KERALA UNIVERSITY Class 8 electrical machine design Question Paper 2021

Practice authentic previous year questions for better exam preparation.

Sample Questions

Derive the output equation of a single phase transformer.
(a) A $250 \mathrm{~kW}, 500 \mathrm{~V}, 600 \mathrm{rpm}$ de generator is built with an armature diameter of 0.75 m and a core length of 0.3 m . The lap connected armature has 720 conductors. Using the data obtained from this machine, determine the...
(b) A $5 \mathrm{~kW}, 250 \mathrm{~V}, 4$ pole, 1500 rpm shunt generator is designed to have a square pole face. The specific loadings are $0.42 \mathrm{~Wb} / \mathrm{m}^{2}$ and 15000A. Full load efficiency is 0.87 , ratio of pole arc to pole pitc...
(b) A $350 \mathrm{~kW}, 500 \mathrm{~V}, 450 \mathrm{rpm}, 6$ pole dc generator is built with an armature diameter of 0.87 m and a core length of 0.32 m . The lap wound armature has 660 conductors. Calculate the specific loadings.
(b) Determine the dimensions of the core, the number of turns and the cross sectional area of conductors in the primary and secondary windings of a $100 \mathrm{kVA}, 2200 / 480 \mathrm{~V}$ single phase core type transformer to operate at a frequenc...