In the presence of frictional resistance, the expression for piston ef – McqOptions

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1.	In the presence of frictional resistance, the expression for piston effort is _________
A.	F(L) F(I)
B.	F(L) + F(I)
C.	F(L) F(I) R(f)
D.	F(L) F(I) + R(f)
Answer» D. F(L) F(I) + R(f)

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