SSC JE Mechanical Engineering 2014 Set 2 Paper

Question : 165 of 200

Marks: +1, -0

The piston of a vertical piston-cylinder device containing a gas has a mass of 60 kg and a crosssectional area 0.04 m

^{2}

. The entire system is placed in a vacuum chamber. If temperature of the gas is 70°C. What is the pressure of gas inside the cylinder ? g = 9.8 m/s

^{2}

Solution:

mass of gas = 60 kg.
cross sectional area = 0.04 m

^{2}

.
temperature of gas = 70°C
pressure of gas P = ?
pressure

p=\force/{\area}={mg}/A={60 ×9.81}/.04

= 14715 N/m

^{2}

. or 0.14715 bar

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