Answer / uma mahesh

because cylindrical shape can occupy less space for getting more volume 

Answer / shubhankar choudhury

cylindrical shapes are ideal
because they have better capacity to
resist internal pressure. They don't
deform under pressure when subjected
to radial forces by the fluid. Moreover,
there is no shear component while in
all other shapes you'll have a shear
force which will tend to deform the
shape.

Answer / ashok jami

Because less wear and tear. Easy to connect piston rings and also easy to insert liner..

Answer / durgarao

Stress concentration is less for cylindrical shapes than any other section. 
Easy to manufacture

Answer / aloke nandi

Machining cylindrical shape of Cylinder and Piston is easier than any other shapes and above all it is easier to seal between piston and cylinder to make it leak proof.

Answer / balwant dhami

it needs to reciprocate so whatever shape, i has to be long and uniform to make a seal. next you dont want the cross section to have any corners because any misalignment could cause them to seize up and gall. The only shape with no corners and no problems if it mis-aligns is a circle. So...a cylinder

Answer / rajan kotadiya

Easy to insert in cylinder and easily moves out from the cylinder and also less Wear and tear . Moreover due to cylinderical shape it less stress concentrates

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