Thermodynamics ...

A heat engine receives heat at the rate of 2500 kJ/min and gives an output of 12.4 kW. Its thermal efficiency is, nearly:

Air undergoes a certain process during which its temperature rises from 300 K to 400 K and the entropy change is 6.4 kJ/K. Calculate the final volume (m³) of air if initial volume was 5 m³ and pressure was 60 kPa.

 A 100 W electric bulb was switched in a 2.5 m × 3 m × 3 m size thermally insulated room having a temperature of 20°C. The room temperature at the end of 24 hours will be ______. (Take ρ of air at atmospheric temperature and pressure = 1.2 kg/m3).

A man starts a 71.8 W fan in as well insulated room of volume 84 m³. The initial temperature of the room was 27°C. (Pressure = 100 kPa) and the fan was rotating for 3 hours. After 3 hours the condition in the room will be? Take, R = 280 J/kg K, C_v = 0.718 kJ/kg K

The gas leaving the turbine of a gas turbine jet engine flows steadily into the engine jet pipe at a temperature of 910°C, a pressure of 2 bar and a velocity of 300 m/s relative to the pipe. Gas leaves the pipe at a temperature of 820°C and a pressure of 1.1 bar. Heat transfer from the gas is negligible. Using the following data, the relative velocity of gas leaving the jet pipe is_______ m/s

Calculate the work done when 1 kg of an ideal gas at a pressure of 10⁵ Pa and volume 6 litre is compressed adiabatically to one-third of its volume. Given \({{C}_{V}}=\frac{3}{2}R\)

Determine the reversible work (in kJ) associated with a process in which a metallic block of 2 kg mass is cooled from 300°C to 150°C by keeping it in the open surrounding at 20°C. Specific heat of metal may be taken as 0.45 kJ/kgK.

A body of mass 2 kg and C_p = 1.00 kJ/kgK is available at 600 K if the atmosphere is 300 K and ln 2 = 0.693, the maximum work obtainable from the body till it comes to equilibrium with the atmosphere is

A gas is compressed in a frictionless piston from an initial state of y m³ and 1 MPa to a final state of 0.2 m³ and 1 MPa. There is a transfer of 40 kJ of heat from the gas and a drop of 20kJ in internal energy. What is the initial state volume of the gas?