REFRIGERATION AND AIRCONDITIONING DIPLOMA IN MECHANICAL ENGINEERING 6TH SEM

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DERARTMENT OF TECHNICAL EDUCATION
DIPLOMA COURSE IN MECHANICAL ENGINEERING
SIXTH SEMESTER
                                                        MODEL QUESTION PAPER
REFRIGERATION AND AIRCONDITIONING
Time: 3Hrs                                                                                                                        Max marks: 100 
          Note:                                                                                                                                       1.Part-I is compulsory                                                                                                                           
2. Answer any six full questions from Part-II, Part-III, and Part-IV
    Choosing at least two from each section

PART- I
1   A) Fill in the blanks with appropriate words:-                                                                  1X5
I)        The refrigerant used in dairy refrigeration is ______________.
ii)       The air refrigerator working on _____________cycle                                               
iii)      ______________ unit of refrigeration
iv)      The automatic expansion valve is used to control the ______________refrigerant. 
v)       The motor and compressor mounted on the same casing in_______________compressor               
    B)  Write a note steam jet refrigeration                                                                             5
                                                                          PART-II
 2 a)     Define the following terms w.r.t refrigeration
          i) Refrigerating effect ii) C.O.P                                                                                  4         
  b)     Explain with block diagram Carnot refrigeration Cycle.                                            5
  c)     State the advantage and disadvantages of air refrigeration system.                           6         
 3 a)     Explain with flow diagram of working of Vapour compression cycle           .                       8
  b)     A Refrigeration working on Bell-Coleman cycle operates between pressures
           limits of 1 bar and 8.5 bar. Air is drawn from the cold chamber at 100C and
           it is cooled to 300C before entering the expansion follow the law PV ^ 1.35 = C                7
           Determine theoretical COP of the system
  4 a)    Explain with the help of TS and HS diagrams the working of vapour compression  5
            Refrigeration system.
   b)    Explain the effects of super heating and under cooling.                                             5
  c)     Differentiate between vapour absorption and vapour compression refrigeration system       5
PART-III
 5   a)   State the Advantages of air cooled and water cooled condensers                                 4         
    b)   Sketch and explain hermitically sealed compressor                                                    6
     c)    Differentiate between natural and forced cooling system                                                      5         
 6  a)    Describe forced convection types Evaporators                                  .                                   4
   b)    State the properties of good refrigerants.                                                                   6
   c)     Sketch and explain thermostatic expansion valve                                                      5
7  a)   Explain the working of high side float valve                                                              5
    b)   State the function of solenoid valve.                                                                          5
    c)   Describe briefly dairy refrigeration                                                                             5
PART-IV

8  a)     Explain with schematic diagram water cooler                                                             5         
  b)     Explain Psychometric chart & its use                                                           5
  c)     Describe briefly psychometric process
          a) Sensible heating   b) Adiabatic saturation                                                               5         
9 a)      Explain installation procedure of refrigeration systems                         .           5
  b)     State the factors affecting Air conditioning                                                             5
  c)      Describe briefly window air conditioner                                                      5

10      Write short note on any three of the following                                                               5x3=15
i)                    Tools used in refrigeration and Air conditioner installation r   
ii)                  Packaged air conditioner
iii)                Cold storage
iv)                Evaporator pressure regulator
v)                  Air refrigeration system


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