Practice Test: Question Set - 30
1. At high Reynolds number
- (A) Inertial forces control and viscous forces are
unimportant
- (B) Viscous forces predominate
- (C) Inertial forces are unimportant and viscous
forces control
- (D) None of these
2. Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an __________ manometer.
- (A) U-tube water
- (B) U-tube mercury
- (C) Inclined tube mercury
- (D) Inclined tube water
3. Sewage sludge is __________ type of non-Newtonian fluid.
- (A) Dilatant
- (B) Bingham plastic
- (C) Pseudo plastic
- (D) None of these
4. The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.
- (A) Steady uniform
- (B) Steady non uniform
- (C) Unsteady uniform
- (D) Unsteady non uniform
5. In fluid flow, cavitation is caused, if the
- (A) Fluid velocity decreases to zero
- (B) Total energy decreases
- (C) Both (a) and (b)
- (D) Flow pressure approaches its vapor pressure at the prevailing
temperature
6. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
- (A) Manometric
- (B) Mechanical
- (C) Volumetric
- (D) Overall
7. Cavitation can be prevented by
- (A) Suitably designing the pump
- (B) Maintaining the suction head sufficiently greater than the vapor
pressure
- (C) Maintaining suction head = developed head
- (D) Maintaining suction head lower than the vapor pressure
8. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.
- (A) Newtonian
- (B) Viscous
- (C) Dilatant
- (D) Non-viscous
9. For the transfer of solution of thick slurry, the pump used is a __________ pump.
- (A) Reciprocating
- (B) Gear
- (C) Diaphragm
- (D) Centrifugal
10. Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity).
- (A) Cd = Cc/Cv
- (B) Cd = Cc.Cv
- (C) Cd = Cv/
Cc
- (D) None of these
11. Bed pressure drop in an air fluidized bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is
- (A) 90
- (B) 60
- (C) 45
- (D) 30
12. A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is
- (A) 20 m/sec
- (B) 10 m/sec
- (C) 5 √2 m/sec
- (D) 5 m/sec
13. Shear stress in a fluid flowing in a round pipe
- (A) Varies parabolically across the cross-section
- (B) Remains constant over the cross-section
- (C) Is zero at the centre and varies linearly with the radius
- (D) Is zero at the wall and increases linearly to the centre
14. Pick out the Hagen-Poiseuille’s equation.
- (A) ∆p/ρ = 4f (L/D) (V2/2gc)
- (B) ∆p = 32 (µLV/gc. D2)
- (C) ∆p/L = 150 [(1 - ε)/ε3]. (µ.V02/g2cD)
- (D) ∆p/L = 1.75 [(1 - ε)/ε3]. (ρV02/gcDp)
15. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)
- (A) d
- (B) 1/d
- (C) σ
- (D) 1/σ
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