# 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.**

*C*,_{d}*C*and_{c}*C*are related (for flow through an orifice) as (where,_{v}*C*= discharge co-efficient,_{d}*C*= co-efficient of contraction = (area of jet at vena-contracta/area of opening),_{c}*C*= co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity)._{v}- (A)

*C*=

_{d}*C*/

_{c}*C*

_{v}- (B)

*C*=

_{d}*C*.

_{c}*C*

_{v}- (C)

*C*=

_{d}*C*/

_{v}*C*

_{c}- (D) None of these

**11. Bed pressure drop in an air fluidized bed of catalyst particles (ρ**

_{p}= 200 kg/m3, D_{p}= 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*= 4

*f*(

*L*/

*D*) (

*V*

^{2}/2

*gc*)

- (B) ∆p = 32 (

*µLV*/

*gc. D*

^{2})

- (C) ∆p/L = 150 [(1 - ε)/ε

^{3}]. (

*µ*.

*V*

_{0}

^{2}/

*g*

^{2}

*cD*)

- (D) ∆p/L = 1.75 [(1 - ε)/ε

^{3}]. (ρ

*V*

_{0}

^{2}/

*gcD*)

_{p}**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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