Constant
Independent of time
Both A & B
Neither A nor B
✅ The correct answer is option C.
Fluid Mechanics MCQs
342. Which of the following quantities are computed by using the hydraulic radius for non-circular ducts?
Velocity and relative roughness
Head loss and velocity
Reynold number, relative roughness and head loss
Reynolds number and friction factor
✅ The correct answer is option C.
343. Sewage sludge is an example of the __________ fluid.
Bingham plastic
Newtonion
Pseudoplastic
Dilatent
✅ The correct answer is option A.
345. With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the
Velocity increases
Pressure decreases
Both A and B
Neither A nor B
✅ The correct answer is option C.
346. Centrifugal pump is normally classified on the basis of the
Rpm
Type of casing
Impeller blade angle
Number of blades in impeller
✅ The correct answer is option B.
347. If in a flow field, between any two points, then the flow must be
Steady, incompressible, irrotational
Steady, compressible, irrotational
Steady, compressible and along a streamline
Unsteady, incompressible, irrotational
✅ The correct answer is option A.
348. Poise is converted into stoke by
Multiplying with density (gm/c.c)
Dividing by density (gm/c.c)
Multiplying with specific gravity
Dividing by specific gravity
✅ The correct answer is option B.
349. During ageing of fluid carrying pipes, the
Pipe becomes smoother with use
Friction factor increases linearly with time
Absolute roughness decreases with time
Absolute roughness increases linearly with time
✅ The correct answer is option D.
350. When a fluid flows over a solid surface, the
Velocity is uniform at any cross-section
Velocity gradient is zero at the solid surface
Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves
Velocity is not zero at the solid surface
✅ The correct answer is option B.