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REFRIGERATION-MECHANIC-UIP---HEALTH-SERVICES Related Question Answers
26. A thermostatic expansion valve function with :-
suction pressure discharge presssure discharge temperature suction temperaturesuction temperature
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27. For ammonia refrigerating system the tubes of a shell and tube condenser are made of Confusedhell and tube condenser are made of:
Copper Aluminium Steel Brass
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28. Convert from CFC 12 to HFC 134 A the compressor displacement will be :
smaller equalequal slightly larger double
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29. The type of condenser used in water cooler :
natural draft forced draftforced draft evaporative water cooled '
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30. Pump down the system for :
more cooling effect to check compressor efficiencyto check compressor efficiency gas charging to attend maintenance in law sideto attend maintenance in low side
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31. Purging is done:
after gas charging before gas charging before vacuumizing before pressurising
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32. The refrigerant enters in the condenser by the :
top side last coillast coil bottom side middle tubemiddle tube
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34. Liquid charged in thermostatic expansion valves sensing bulb is :
alcohol same refrigerant mercury nitrogen
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36. The colour of the flame of halide torch in case of leakage of Freon refrigerant will change to:
yellow redred bright green orange
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37. Which type of valve is used in a reciprocating refrigeration compressor?
rotary valve poppet valve ring plate glob valve
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38. The presence of frost on the cooling coils of the evaporator of a refrigeration system :
increases the compressor pressure act as the insulator and decreases the heat transfer rate makes the compressor run for comparatively short durations reduce the life of cooling coils
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39. Dry ice is :
solidified carbondioxide ice free from dissolved air and gases ice free from impurities ice made from transparent distilled water
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40. Which of the following machines can be used to obtain refrigeration at places where there is no electric power?
air refrigeration steam jet refrigeration vapour compression vapour absorption
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41. Rectifiers are used for converting :
voltage into current AC to DC DC to AC voltage in to velocity
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42. The operation theatre in a hospital is to be air conditioned suggest the percentage of outside air being circulated in the theatre :
zero 50 20 100
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43. The difference between D.B.T. and W.B.T. is called:
wet bulb depression dew point depression effective temperature adiabatic saturation temperature
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44. The absolute zero temperature corresponds on the condition when :
all the substances exit only as solids volume of a gas reduces to zero kinetic energy of ga9 molecules become zero no pressure is exerted by the gas
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45. The oil used with 134 A refrigerant is :
Mineral oil Capilla D Polyol ester oil Lubricating oil
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47. Dehydrator is installed in the :
liquid line discharge line suction line charging linecharging line
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48. The device which used to find relative humidity :
Pyrometer Anemometer Hydrometer Hygrometer
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49. Chemical name of Freon 22 is :
Dichloro difiuoro methane Monochloro difluoro methane Trichloro monofluoro methane Dichloro monofluoro methane
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50. The capacity of visible cooler is expressed in :
cubic feet litres k.cal/TR tons of refrigeration
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