In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?
Correct answer: D. 2.5 to 4.0
- A. 0.5 to 1.5
- B. 10 to 15
- C. 5 to 10
- D. 2.5 to 4.0
Explanation
Sieve-tray hole pitch is typically about 2.5 to 4 times the hole diameter, giving adequate open area without making the perforations so close that the tray weakens or behaves poorly. A pitch below the hole diameter is geometrically impossible, while much larger pitches reduce active area.
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