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

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1.	A perforated plate has holes of diameter dₙ 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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