KERALA UNIVERSITY Class 7 refrigeration and air conditioning Question Paper 2013

Practice authentic previous year questions for better exam preparation.

Sample Questions

(b) In an air-conditioning plant, an air handling unit supplies a total of $4000 \mathrm{~m}^{3} / \mathrm{min}$ of dry air which comprises by mass $20 \%$ fresh air at $39^{\circ} \mathrm{C}$ DBT and $26^{\circ} \mathrm{C}$ WBT and $80 \%$ recircula...
What are mixed refrigerants? Where they are used?
(b) What are the different desirable properties of refrigerants?
A heat pump works on reversed Carnot cycle between temperature limits of $-10^{\circ} \mathrm{C}$ and $27^{\circ} \mathrm{C}$. Find its COP.
(a) A bootstrap cooling system of 9 tonnes refrigeration capacity is employed in an airplane. The ambient air temperature and pressure are $20^{\circ} \mathrm{C}$ and 0.86 bar respectively. The pressure of air increases from 0.86 bar to 1 bar due to ...