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REFRIGERATION-MECHANIC-UIP---HEALTH-SERVICES Related Question Answers
51. HFC 134 A appliance has capillary length when compare to CFC unit:
10% to 20% more 20% short 50% longer same length
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52. The effectiveness of the cooling tower is dependent on :
Dry bulb temperatureof theair Direction of theflow of air Wet bulb temperatureof theair None of the above
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53. Milky white ice obtained if:
impurities are present in' water due to the presence of C02 by keeping in an insulated chamber air is present in it
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54. In a shell and coil condenser:
water flows in the shell and refrigerant in the coil only refrigerant flows through the shell as well as coil only water flows through the shell as well as coil water flows in the coil and the refrigerant in the shell
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55. In a thermal electric expansion valve which senses the suction temperature is :(A)Transformer
Transformer Thermister Thermostat Rheostat
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56. In a flooded evaporator which of the following types of expansion, device is employed :(A)float valvecr
float valve capillary tube automatic expansion valve thermostatic expansion valve
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57. In an ice plant the function of brine agitator is :
to increase COP to reduce compressor power to obtain uniform temperature to super heat the refrigerant gas
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58. In an air conditioning system the comfort conditions are defined by:
15°C DBT 90% RH 25°C DBT 35% RH 20°C DBT 80% RH 22°CDBT60% RH
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59. The electrical component of automobile air conditioner allows to engage and disengage the compressor from the thermostat:
Rheostat Thermostat Fuse Magentic clutch
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60. Sum of atmospheric pressure and gauge pressure is called :
Total pressure Absolute pressure Normal pressure Natural pressure
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61. The diode used for voltage regulation is :
Rectifier diode Signal diode Zener diode Vari cap diode
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62. The specific humidity is the mass of water vapour present in :
1 kg of dry air 1 m3 of dry air 1 ms of wet air 1 kg of wet air
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63. Which one of the following oxy fuel gas flames has the highest flame temperature?
Oxy hydrogen Oxy acetylene flame Oxy coal gas flame Oxy LPG flame
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64. A micrometer has a positive error of 0.02 MM. What is the correct reading when micrometer measures 25.37 MM :
25.35 MM 25.43MM25.43 MM 25.39 MM 26.41 MM
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66. Start the compressor without relay to short:
C and S terminal S and R terminal C and R terminal Compressor body and S terminalCompressor body and S terminal
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67. There is no relay and starting capacitor in :
CSR circuit CSIR circuit RSIR circuit PSC circuit
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69. Select the period of interval for a defrost cycle in a frost free refrigerator :
once in 12hours once in 24 hours once in 36hours once in 48 hours
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70. Select the boiling point of refrigerant 134 A at 1 atmosphere :
-31.5°C -29.8°C -26.1°C -11.8°C
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71. Most important property of insulating material is :
odourless easy to handle light in weight low conductivity
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72. The component which control the bimetal thermostat is:
Defrost heater Fan motor Overload protector P.T.C. Relay
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73. HC refrigerant using systems should be vacuumized upto :
2000 Microns Hg 500 Microns Hg 100 Microns Hg 1000 Microns Hg water
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74. When compare to CFC 12 the charge of 134 A will be :
90% to 95% 25% extra same weight _ twice quantity
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75. The swash plate compressor is most frequently used in :
Refrigerators Window air conditioners Split air conditioners Car air conditioners
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