Refrigeration and Air Conditioning, Question Paper of M.Tech 6 Semester, Download Previous Years Question Paper 8

REFRIGERATION AND AIR CONDITIONING

6^th Exam/Mech/5306/May’07

Duration : 3hrs 

M.M. 75

Section A

01. Fill in the blanks .

a. One tonne of refrigeration means heat removal at the rate of______

b. Chemical formula of R-11 is_________

c. Ratio of __________to _________is called S.H.F.

d. C.O.P. is the ratio of_________ to___________

e. In Electrolux –refrigeration, the three fluids used are . __________ . ___________ and ________

f. ________is used in ice plant as refrigerant.

g. During sensible heating of air. Its___________ humidity does not change.

h. Differentiate between DST and DPT is called______________

i. BET-and WBT are equal. when the air is._____________

j. COP of air compression refrigerator is _____________(less, more. equal) as compared to that of vapour compression refrigerator.

Section B

Note: Attempt any five questions. 615

02 i. Explain Bell coleman cycle with the. help of p-v diagram.

ii. Explain the effects of sub cooling with the help of p-h diagram.

iii. Explain flooded evaporator with the help of p-h diagram.

iv. Explain flooded evaporator with the help of sketch.

v. With the help of psychometric chart sketch explain the process of adiabatic chemical dehu -modification.

vi. The surface temperature of foil is 40°C. the temperatures of air at inlet and outlet are 15^oC and 25^oC respectively. Calculate the bypass factor.

vii. Write the advantages of vapour absorption system over vapour compression system.

Section C

Note: Attempt any three questions.

Q3. Explain domestic Electrolux system with the help of sketch.

0.4. Explain the construction and working of reciprocating compressor.

Q5. Write the properties of an ideal refrigerant

06. Explain in brief:

a. Room sensible heat factor

b. Effective room sensible heat factor

c. Grand sensible heat factor