If a mass of moist air in an airtight vessel is heated to a higher temperature, then
Question 2
The thermodynamic cycle shown in figure (T-s diagram) indicates
Question 3
The formation of frost on cooling coilsin a refrigerator
Question 4
The COP of a Carnot heat pump operating between 6 °C and 37 °C is .........
Question 5
In the Rankine cycle shown, if the heat is added in between states S4 and S1 with temperature of about 210 C. If the heat rejection from S2 to S3 appears in cooling temperature of 35.8 C, then what will be the thermal efficiency.
Question 6
A reversed Carnot cycle refrigerator maintains a temperature of -5 °C. The ambient air temperature is 35 °C. The heat gained by the refrigerator at a continuous rate is 2.5 kJ/s. The power (in watt) required to pump this heat out continuously is ____
Question 7
An industrial heat pump operates between the temperatures of 27 °C and –13 °C. The rates of heat addition and heat rejection are 750 W and 1000W, respectively. The COP for the heat pump is
Question 8
A heat engine having an efficiency of 70% is used to drive a refrigerator having a co-efficient of performance of 5. The energy absorbed from low temperature reservoir by the refrigerator for each kJ of energy absorbed from high temperature source by the engine is
Question 9
Atmospheric air at a flow rate of 3 kg/s (on dry basis) enters a cooling and dehumidifying coil with an enthalpy of 85 kJ/kg of dry air and a humidity ratio of 19 grams/kg of dry air. The air leaves the coil with an enthalpy of 43 kJ/kg of dry air and a humidity ratio of 8 grams/kg of dry air. If the condensate water leaves the coil with an enthalpy of 67 kJ/kg, the required cooling capacity of the coil in kw is
Question 10
An ideal gas when compressed to half of its initial volume in a constant temperature process, 600 J of energy is removed from gas during compression in the from of heat. What will be the change in internal energy?
