157) The gas in cooling chamber of a closed cycle gas turbine is cooled at

Answer is:

constant pressure

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158) Which of the following is the correct statement?

For a given compression ratio, both Otto and Diesel cycles have the same efficiency.

For a given compression ratio, Otto cycle is more efficient than Diesel cycle.

For a given compression ratio, Diesel cycle is more efficient than Otto cycle.

The efficiency of Otto or Diessel cycle has nothing to do with compressioin ratio.

Answer is:

For a given compression ratio, Otto cycle is more efficient than Diesel cycle.

159) The temperature at which the volume of a gas becomes zero is called

Answer is:

absolute zero temperature

Explanation:

The temperature at which the volume of a gas becomes zero is called Absolute zero temperature.
Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvins.
At zero kelvin (minus 273 degrees Celsius) the particles stop moving and all disorder disappears. Thus, nothing can be colder than absolute zero on the Kelvin scale.
According to kinetic theory of gases, the absolute zero temperature is attained when kinetic energy of the molecules is zero.