Pick out the correct statement pertaining to Venturimeter ?

Question

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None of these

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A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically

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downward, than when the flow is vertically upward

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The co-efficient of contraction of a Venturimeter is always unity

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For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when

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compressibility is taken into account, than when it is neglected

Question #82868