Advanced Refrigeration Engineering Question Paper 2013 for BPUT 1st Sem M.Tech in Thermal Engineering is given below. This questions were asked in 1st sem M.Tech exam of 2013-15 admission batch. In this paper the questions are asked from C.P. Arora book of Refrigeration Engineering. Download and prepare this question to score good marks.
First Semester Examination – 2013
Advanced Refrigeration Engineering Question Paper 2013
Time: 3 Hours
Max Marks: 70
Answer Question No.1 which is compulsory and any five from the rest.
The figures in the right hand margin indicate marks.
Q1. Answer the following questions: (2 x 10)
a) Is HCFC-123 safe to use in centrifugal chillers? Why?
b) What are the usefulness of solenoids and relays in AC systems?
c) What are the methodologies adopted for Leak detection in Refrigeration system.
d) Differentiate between absorbents and adsorbents.
e) What do you mean by eco-friendly refrigerants? Give two examples.
f) Sketch the vortex tube refrigeration system.
g) What are various factors affecting human comfort.
h) Define Energy performance ratio (EPR) & express its relationship with COP.
i) Discuss effect of moisture and oil miscibilityin refrigerants.
j) What if BPF used in air conditioning. How efficiency of the heating/cooling system is related with it?
Q2 a) Discuss with neat sketch the principle of the system for compound compression with multiple expansion valves and flash intercooling system.
b) A vapor compression system with (Ammonia) NH3 as refrigerant works between the pressure limits of 2 bar and 14 bar. It is fitted with expansion valves and flash chambers such that the vapours are extracted at 6 bar and 10 bar and sent to the appropriate compressor suction. For a refrigerating load of 18-tonnes, calculate the power required to .drive the three compressors.
Q3 a) Explain Cascade refrigeration system and also give its advantages. b) Compare vapor absorption and vapor compression refrigeration system.
Q4. Briefly Describe the design and construction details of unitary refrigeration equipment.
Q5. For an ideal vapor compression refrigeration system operating with R-22 at an evaporator temperature of -10°C and condensing at 30°C, find the following: the compressor suction and discharge pressures, enthalpies, and specific volumes; the condenser discharge pressure and enthalpy; the refrigeration COP; and the refrigerant mass flow rate and power requirement for a 10-ton refrigeration unit.