**652. An equipotential line is _____________ to the velocity vector at every point?****A. Normal**

B. Parallel

C. Tangential

D. None of these

**653. A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to_________________?****A. Lρv2/D**

B. LμV/D2

C. Dρv2/L

D. μV/L

**655. During ageing of fluid carrying pipes, the__________________?**

A. Pipe becomes smoother with use**B. Friction factor increases linearly with time**

C. Absolute roughness decreases with time

D. Absolute roughness increases linearly with time

**656. In fluid flow, the stagnation point is defined as a point, where the _____________ is zero?**

A. Flow velocity

B. Pressure

C. Total energy**D. All A., B. and C.**

**657. A hydraulic ram acts as a/an ______________ pump?****A. Centrifugal**

B. Reciprocating

C. Impulse

D. Parallel cylinder

**658. Viscosity of water is about _____________ times that of air at room temperature?**

A. 15**B. 55**

C. 155

D. 1050

**659. Sewage sludge is an example of the ______________ fluid?****A. Bingham plastic**

B. Newtonian

C. Pseudo plastic

D. Dilatent

**NOTEIF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.THANK YOU**