A Pump supplies oil at $0.002 m^{3} / s e c .$ to a 50 mm diameter double acting cylinder and a rod diameter is 20 mm. If the load is 6000 N bolts in extending and retracting stroke.

Pressure during the extension and return strokes are

35 b a r, 36.5 b a r

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40.2 b a r, 42.5 b a r

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30.6 b a r, 36.4 b a r

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36.4 b a r, 38 b a r

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Solution

The correct option is C $30.6 b a r, 36.4 b a r$
$Cylinder pressure during extension stroke (P_{i n}) = \frac{F}{A p} = \frac{6000}{\frac{π}{4} (0.05)^{2}} = 30.6 b a r Cylinder pressure during return stroke (P_{R}) = \frac{F}{A p - A r} = \frac{6000}{\frac{π}{4} ({0.05}^{2} - {0.02}^{2})} = 36.4 b a r$

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