Refrigeration and Air Conditioning, Question Paper of M.Tech 6 Semester, Download Previous Years Question Paper 9

REFRIGERATION AND AIR CONDITIONING

6^th Exam/Mech/5306/May’08

Duration: 3 Hrs.                                                                           Max Marks: 75

Note: Attempt any five questions. O. No. ‘l is compulsory.

Q1 Fill in the blanks: - _

i. The GOP of Carnot pump is ___________than of the GDP of a ________ refrigerator.

ii. In a refrigeration system. The_________ pressure is kept as __________ as ________ possible.

iii. Volurnetric efficiency_________

iv. The unit of GOP. Is___________

v. The refrigerant used in ice-plant is

vi. The efficiency of a coil will be when its bypass factor is

vii. The unit of refrigeration is

viii. A fan used to remove the air gases from as space by suction is known as

02 a. Differentiate between a refrigerator and a heat ‘pump with line diagram. 

b.. Use PV and T-S diagrams to explain ideal refrigerator and find CUP. 

Q3  A reversed Carnot cycle is used for heating and cooling.  The work supplied is 10 KW. If the COP is 3.5 for cooling determines:

i. T₂/T₁

ii. Refrigeration effect in tons.

iii. COP for heating

04 a. Give the comparison of simple vapour compression with reversed carnot cycle with reference of TS diagrams.

b. Drive the relation for clearance volumetric efficiency and also shown the same on PV diagram.

Q5 a. Explain Electrolux refrigerator with flow diagram. '10

b. Give any five Halocarbon refrigerants with their chemical formula and numerical desrgnattons.

Q6 a. In a laboratory test the sling-psychomotor recorded the following reading:

Dry bulb temp=3fl”C. wet bulb temp=25DC

Find:

a. Vapour pressure

b. Specific humidity

c. Relative humidity

d. Vapour density in air

e. Enthalpy of the mixture per Kg of dry air

Q7  a. Draw labeled psychometric chart and explain briefly.

b. Draw layout of modern air-conditioning system.

Q8 Write short “notes on any three:

i. Labeled diagram of evaporator condenser

ii. Thermostatic expansion valve

iii. Rotary compressor

iv. Shell and coil condenser