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Previous Year Exam Questions for Refrigeration and Air Conditioning - RAC of 2018 - BPUT by Bput Toppers

  • Refrigeration and Air Conditioning - RAC
  • 2018
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Mechanical Engineering
  • B.Tech
  • 1480 Views
  • 42 Offline Downloads
  • Uploaded 9 months ago
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Registration No : Total Number of Pages : 02 B.Tech PCME4402 7th Semester Back Examination 2018-19 REFRIGERATION AND AIR CONDITIONING BRANCH : MECH Time : 3 Hours Max Marks : 70 Q.CODE : E437 Answer Question No.1 which is compulsory and any FIVE from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) Q3 Answer the following questions : Draw the schematic of multistage compression system with flash intercooler. Mention the effects of lubricants on refrigerants. What do you mean by Absorbents? How is different from Adsorbents? What do understand by adiabatic humidification? What do you mean by efficiency of heating coil? Explain effect of variation of suction pressure and discharge pressure on performance of refrigeration system. Write down merits and demerits of air refrigeration system. What do you understand by primary refrigerant? Give two examples of secondary refrigerants. What is COP? Mention the COP relationship between refrigerator and a heat pump Differentiate between RSHF and GSHF. (2 x 10) Derive the expression of COP for Reversed Bryton cycle. Air enters the compressor of an ideal Bryton refrigeration cycle at 1 bar and 270K with volumetric flow rate is 1.5 m3/sec. If the compressor pressure ratio is 3 and the turbine inlet temperature is 300K. Determine (i) the net power output (ii) the refrigeration capacity (iii) COP (5) (5) Draw a neat sketch of LiBr+H2O vapor absorption system and explain its working principle. How d (10) Q4 a) b) What are the desirable properties of a good refrigerant? Explain Cascade refrigeration system and also give its advantages. (5) (5) Q5 a) Draw and explain the actual vapor compression diagram on T-s and p-h plots The pressure in the evaporator of an ammonia refrigerator is 1.902 bar and the pressure in the condenser is 12.37 bar. Calculate the refrigeration effect per unit massof refrigerant and COP for the following cycles The dry saturated vapor delivered to the condenser after isentropic compression and no undercooling of the condensed liquid and then throttling of refrigerant to evaporator pressure. (5) (5)

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Q6 a) b) Q7 Q8 a) b) c) Explain the following : i) absolute humidity ii) relative humidity iii) degree of saturation Air at 28°C and 1 bar has a specific humidity of 0.016 kg per kg of dry air. Determine (i) partial pressure of water vapor (ii) relative humidity (iii) dew point temperature (iv) specific enthalpy of moist air. (5) Briefly discuss on Summer air conditioning system and Winter air conditioning system. (10) Write short answer on any TWO : Effective temperature and comfort chart Thermoelectricrefrigeration system Ejector refrigeration system (5) (5 x 2)

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