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Which material is used in the diaphragm of an A.C mechanical pump?.

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in Automotive Engine Design by (137k points)
Which material is used in the diaphragm of an A.C mechanical pump?.

(a) Paper

(b) Metal sheet

(c) High-grade cotton and rubber

(d) Ceramic

I got this question in examination.

I'm obligated to ask this question of Petrol Engine Fuel Supply System topic in division Petrol Engine Fuel Supply System of Automotive Engine Design

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Correct choice is (c) High-grade cotton and rubber

The explanation: The diaphragm used in the A.C mechanical pump is made out of high-grade cotton impregnated with synthetic rubber. The downward movement of the diaphragm causes a vacuum in the chamber which causes the inlet valve to open.

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