Question

Which of the featured of expansion valves in the following lists are correctly matched?

                        Expansion Device                                           Feature

         1. Capillary tube                                     1. Choking

         2. Thermostatic expansion valve            2. Constant temperature

         3. Automatic expansion valve                3. Constant degree of superheat

         4. Float valve                                         4. Mass flow rate of refrigerant is proportional to load

         Select the correct answer using the codes given below?

         (a) 1 and 2          (b) 1 and 3       (c) 1 and 4       (d) 3 and 4