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10 Cards in this Set
- Front
- Back
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The type of brine used for a hockey rink refrigeration system is usually a) calcium sulphate b) calcium chloride c) calcium carbide d) calcium nitrate e) sodium chloride |
b) calcium chloride |
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Which statements is not true? a) the heat pressure and temperature are directly related b) the evaporator temperature and pressure are directly related c) temperature of the cooling medium for the condenser has reverse effect on the temperature of the condenser d) condenser pressure is always more that the evaporator pressure e) the discharge pressure of the condenser is equal to the upstream pressure of the expansion valve |
c) temperature of the cooling medium for the condenser has reverse effect on the temperature of the condenser |
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Which statement is false? a) compressore makes the refrigerant pressure to rise b) compressor makes the refrigerant temperature ride c) refrigerant looses sensible heat and latent heat in the condenser d) control valve does not have effect on the refrigerants pressure e) refrigerant gains heat in the evaporator |
d) control valve does not have effect on the refrigerants pressure |
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In an indirect refrigeration system, how can we ascertain that the circulating chilled water wont freeze up a) keep the discharge pressure of compressor higher than its suction pressure b) make sure that the evaporator temperature does not sink below zero degrees c) control the temperature of evaporator and condenser of the refrigerant system d) keep the temperature of water at or above 5°C e) control the regulating valve at the evaporator |
d) keep the temperature of water at or above 5°C |
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Raising the condensing point (saturation temp) of the refrigerant vapour above the temp of the cooling medium is the function of the: a) compressor b) condenser c) evaporator d) absorber e) refrigerant |
a) compressor |
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Which of the following are principal parts in a closed cycle compression refrigeration system? a) condenser and evaporator b) compressor c) absorber, evaporator, and condenser d) evaporator, compressor, and condenser e) abdorber, evaporator, and condenser |
d) evaporator, compressor, and condenser |
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Which of the following is not an advantage of a factory assembled packaged refrigeration system a) components are designed to match each other b) parts can be ordered and installed separately c) the unit is more compact d) space requirements are minimized e) the unit is equipped with all the required auxiliary equipment |
b) parts can be ordered and installed separately |
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What is the primary difference between a direct and indirect refrigeration system? a) type of heat transfer medium b) type of refrigerant c) evaporator pressure d) compressor location e) evaporator location |
e) evaporator location |
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The temperature in the evaporator a) depends on pressure in the receiver b) will decrease when the compressor stops c) depends on the pressure in the evaporator d) depends on the ambient temperature e) is controlled by the charging valve |
c) depends on the pressure in the evaporator |
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Refrigerant condensers a) are always water cooled b) cool the gas refrigerant discharged from the compressor c) have a safety valve d) remove sensible heat only from the refrigerant e) are not required for freon type refrigerants |
b) cool the gas refrigerant discharged from the compressor |
