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CBSE Guess > Papers > Question Papers > Class XII > 2010 > Air Conditioning and Refrigeration IV

Air Conditioning and Refrigeration IV 2010 Question Paper For CBSE Class XII Exams

Air Conditioning and Refrigeration IV

  1. Briefly describe the following : (42 Marks)
    (a) Package unit
    (b) Heating and humidifying equipment
  2. Why are ducts used in an air-conditioning system ? List the factors due to which pressure of air falls in a duct. (8 Marks)
  3. Differentiate control system. Give examples of both types of elements.(8 Marks)
  4. Describe the functions and working of a modulating motor. (8 Marks)
  5. List various electrical faults, usually found in a domestic refrigerator.(8 Marks)
  6. Explain the procedure of charging through suction line, with the help of a neat diagram.( 8 Marks)  
  1. Describe the working of the following : (42 Marks)
    (a) Compressor
    (b) Relays
  2. Write short notes on any two of the following : (42 Marks)
    (i) Bypass control
    (ii) Safety switches
    (iii) Pressure testing
    (iv) Cooling coil

 

Air Conditioning and Refrigeration IV 2010 Question Papers Class XII

CBSE 2010 Question Papers Class XII