##### Q21. Continuity equation deals with the law of conservation of

(a) mass
(b) momentum
(c) energy
(d) none of the above.

Ans:  (a) mass

##### Q22. Consider an incompressible laminar boundary layer flow over a flat plate of length L, aligned with the direction of an incoming uniform free stream. If F is the ratio of the drag force on the front half of the plate to the drag force on the rear half, then

(a) F < 1/2
(b) F = 1/2
(c) F = 1
(d) F > 1.                                                                                    (GATE-ME-2007)

Ans:  (d) F > 1.

##### Q23. For a floating body, if the metacentre is above the centre of gravity, the equilibrium is said  to be

(a) stable
(b) unstable
(c) neutral
(d) none of the above.

Ans:  (a) stable

##### Q24. A Kaplan turbine is

(a) a high head mixed flow turbine
(b) a low head axial flow turbine
(c) an outward flow reaction turbine
(d) an impulse inward flow turbine.                                                        (GATE-ME-1997)

Ans:  (b) a low head axial flow turbine

##### Q25. The ratio of inertia force to viscous force is known as

(a) Reynolds number
(b) Froude number
(c) Mach number
(d) Euler number

Ans:  (a) Reynolds number

##### Q26. Existence of velocity potential implies that

(a) Fluid is in continuum
(b) Fluid is irrotational
(c) Fluid is ideal
(d) Fluid is compressible.                                                                                       (GATE-ME-1994)

Ans:  (b) Fluid is irrotational

##### Q27. A streamline and an equipotential line in a flow field

(a) are parallel to each other
(b) are perpendicular to each other
(c) intersect at an acute angle
(d) are identical.                                                                                                     (GATE-ME-2011)

Ans:  (b) are perpendicular to each other

##### Q28. A hydraulic turbine develops 1000 kW power for a head of 40 m. If the head is reduced to 20 m, the power developed (in kW) is

(a) 177
(b) 354
(c) 500
(d) 707.                                                                                                       (GATE-ME-2010)

Ans:  (b) 354

##### Q29. Flow separation in flow past in a solid object is caused by

(a) a reduction of pressure to vapour pressure
(d) the boundary layer thickness reducing to zero.                         (GATE-ME-2002)

Ans:  (c) a positive pressure gradient

##### Q30. The discharge in m3/s for laminar flow through a pipe of diameter 0.04 m having a centre line velocity of 1.5 m/s is

(a) 3π/50
(b) 3π/2500
(c) 3π/5000
(d) 3π/10000.                                                                                         (GATE-ME-1988)

Ans:  (d) 3π/10000.

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Hydraulics and Fluid mechanics MCQ-Section-1

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