5 mole of an ideal gas with initially at STP are compressed adiabatically so that its temperature becomes . The increase in the internal energy of gas in kJ is
Three designs are proposed for an engine operating between 500 K and 300 K. For 1 kcal of heat input, design claims to produce 3000 J of work, design claims to produce 2000 J of work and design claims to produce 1680 J of work. The design which is possible
A given mass of a gas is compressed isothermally until its pressure is doubled. It is then allowed to expand adiabatically until its original volume is restrored and is pressure is then found to be 0.75 of its initial pressure. The ratio of the specific heats of the gas is approximately