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In any flow through a system, if the area of cross section in which the metal is flowing, decreases, how will it affect the velocity?

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In any flow through a system, if the area of cross section in which the metal is flowing, decreases, how will it affect the velocity?

(a) Increases

(b) Decreases

(c) No affect

(d) Quantities not related
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Correct answer is (a) Increases

To explain I would say: If the area of cross section of the system through which the molten metal is flowing, gets a decrease, then the velocity of the flow would increase, as the two hold an inverse relation.
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