Refrigeration and Air Conditioning The freezing point of R-12 is -107.7°C -95.2°C -135.8°C -86.6°C -107.7°C -95.2°C -135.8°C -86.6°C ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process Takes place at constant pressure Takes place at constant temperature Involves no change in volume Takes place at constant entropy Takes place at constant pressure Takes place at constant temperature Involves no change in volume Takes place at constant entropy ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The operating pressure for refrigerating units using R-12 as a refrigerant is 15 bar 30 bar 2 bar 8 bar 15 bar 30 bar 2 bar 8 bar ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning In a vapour compression refrigeration system, a throttle valve is used in place of an expander because It improves the C.O.P., as the condenser is small It considerably reduces mass of the system The positive work in isentropic expansion of liquid is very small It leads to significant cost reduction It improves the C.O.P., as the condenser is small It considerably reduces mass of the system The positive work in isentropic expansion of liquid is very small It leads to significant cost reduction ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning In a psychrometric chart, specific humidity (moisture content) lines are Horizontal and uniformly spaced Horizontal and non-uniformly spaced Curved lines Vertical and uniformly spaced Horizontal and uniformly spaced Horizontal and non-uniformly spaced Curved lines Vertical and uniformly spaced ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg) 125 kJ/kg 25 kJ/kg 100 kJ/kg 50 kJ/kg 125 kJ/kg 25 kJ/kg 100 kJ/kg 50 kJ/kg ANSWER DOWNLOAD EXAMIANS APP
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