A perforated plate has holes of diameter dh arranged in a pitch ph. – McqOptions

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1.	A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by
A.	(ph - dh)/ph
B.	(ph - dh . dt/2)/ph
C.	(ph - dt)/ph
D.	(ph - dh)/dh
Answer» D. (ph - dh)/dh

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