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

NOTE
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