REEFRIGERATIDN &AIR CONDITIONING
6th Exam/Mech
Duration: 3Hrs.
M.M: 75
Note : Attempt any titre questions.
Q1
a. Differentiate between COP and efficiency.
b. What is the unit of refrigeration and how it can be
found?
c. Define specific heat.
Q2
a. Sketch T-e and p-h diagrams for the vapour after
compression is:
i. Dry saturated
ii. Wet
b. Explain the effects of sub-cooling with the help of
p-h diagram.
03 a. What are the desirable properties of an idea! Refrigerant?
b. Write short note on e42 and Ft-22 as a refrigerant.
04 a. Write down the advantages and disadvantage-s of
air-refrigeration system over vapour compression system.
b. Write down arI equation of man flow rate and work done
with respect to Bell-Coleman cycle.
05 Draw a neat diagram of Lithium Bromide Wate absorption
stream and explain its working. List the major field of applications of this
system- 15
06 a. Explain with the help of a neat sketch the
principle of operation of a single stage. Single acting reciprocating compressor.
b. Differentiate between water-cooled and air cooled
condenser.
Q7 a. Differentiate between DX and flooded evaporators.
b. Explain in brief as to why capillary tube is preferred
to other throttling devices in household refrigerators.
8. Write short note on.
i. Specific Humidity and relative humidity
ii. Room sensible heat factor
iii. Thermostatic expansion vlave.
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