Thermodynamics ...

A single fixed point temperature scale is based on

A fan is used to deliver air at the rate of 5 m³/s with a velocity of 10 m/s. Find the power in Watts that must be supplied to the fan. Density of air = 1.2 kg/m³.

A cylinder contains 5 m³ of ideal gas at a pressure of 1 bar. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this process is

One reversible heat engine operates between 1000 K and T₂ K and another reversible heat engine operates between T₂ K and 400 K. If both the engines have the same heat input and output, then the temperature T₂ must be equal to:

A window receives 200 W of heat transfer at the inside surface of 20°C and transmits the 200 W from its outside surface at 2°C continuing to ambient air at -5°C. Find the window’s rate of entropy generation.

Two air streams with mass flow rates of 36 kg/min and 14 kg/min with respective enthalpies of 36 kJ/kg da and 50 kJ/kg da are mixed. The enthalpy of the mixture is nearly

Heat and work are

The thermal efficiency of the hypothetical cycle shown is

Which one of the following relationships defines the Helmholtz function F?

A balloon containing an ideal gas is initially kept in an evacuated and insulated room. The balloon ruptures and the gas fills up the entire room. Which one of the following statements is TRUE at the end of above process?

If the work done on a closed system is 20 kJ/kg, and 40 kJ/kg heat is rejected from the system, change in internal energy is