Refrigeration and Air Conditioning At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant decreases increases depends on other factors remains same decreases increases depends on other factors remains same ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called None of the listed here Super-cooling Normal cooling Sub-cooling or under-cooling None of the listed here Super-cooling Normal cooling Sub-cooling or under-cooling ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The higher temperature in vapour compression cycle occurs at Expansion valve Receiver Evaporator Compressor discharge Expansion valve Receiver Evaporator Compressor discharge 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 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) 100 kJ/kg 125 kJ/kg 25 kJ/kg 50 kJ/kg 100 kJ/kg 125 kJ/kg 25 kJ/kg 50 kJ/kg ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice In 1 hour In 24 hours In 12 hours In 1 minute In 1 hour In 24 hours In 12 hours In 1 minute ANSWER DOWNLOAD EXAMIANS APP
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