# Practice Test: Question Set - 10

**1. The head loss due to sudden contraction is proportional to**

- (A) Velocity

- (B) Velocity head

- (C) Turbulence

- (D) None of these

**2. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid.**

- (A) Newtonian

- (B) Dilatant

- (C) Pseudo-plastic

- (D) Non-Newtonian

**3. Critical velocity in a pipe flow**

- (A) Increases as fluid viscosity increases

- (B) Increases as pipe diameter increases

- (C) Independent of fluid density

- (D) None of these

**4. The time of oscillation of a floating body is**

- (A) Longer, if Metacentric height is increased

- (B) Independent of the Metacentric height

- (C) Dependent on the buoyant forces only

- (D) None of these

**5. Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f**

_{1}and that for smooth pipe is f_{2}. Pick out the correct statement.- (A)

*f*

_{1}=

*f*

_{2}

- (B)

*f*

_{1}<

*f*

_{2}

- (C)

*f*

_{1}>

*f*

_{2}

- (D) Data not sufficient to relate

*f*

_{1}&

*f*

_{2}

**6. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where,**

*r*= pipe radius,*x*= distance).- (A)

*V*/

*V*= (

_{max}*x*/

*r*)

^{1/7}

- (B)

*V*/

*V*= (

_{max}*r*/

*x*)

^{1/7}

- (C)

*V*/

*V*= (

_{max}*x*.

*r*)

^{1/7}

- (D) None of these

**7. Choose the set of pressure intensities that are equivalent.**

- (A) 4.33 psi, 10 ft. of water, 8.83 inches of Hg

- (B) 4.33 psi, 10 ft. of water, 20.7 inches of Hg

- (C) 10 psi, 19.7 ft. of water, 23.3 inches of Hg

- (D) 10 psi, 19.7 ft. of water, 5.3 inches of Hg

**8. The Reynolds number for an ideal fluid flow is**

- (A) 4

- (B) 2100-4000

- (C) 4000

- (D) ∞

**9. Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head.**

- (A) Elevation

- (B) Pressure

- (C) Both (a) & (b)

- (D) Neither (a) nor (b)

**10. A centrifugal pump has the following specifications:**

**Power = 4 H.P.; Speed = 800 rpm**

**Head = 8 meters**

**Flow = 1000 liters/minutes.**

**If its speed is halved, then the new head will be __________ meters.**

- (A) 2

- (B) 4

- (C) 8

- (D) 5.5

**11. Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.**

- (A) 0.5

- (B) 5

- (C) 50

- (D) 500

**12. Enamels and paints are generally __________ fluid.**

- (A) Rheopectic

- (B) Pseudo-plastic

- (C) Thixotropic

- (D) Dilatant

**13. Stoke's law is valid, when the particle Reynolds number is**

- (A) < 1

- (B) > 1

- (C) < 5

- (D) None of these

**14. The distance between metacentre and __________ is called metacentric height.**

- (A) Water surface

- (B) Centre of gravity

- (C) Centre of buoyancy

- (D) None of these

**15. If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is**

- (A) Same in both the tubes

- (B) Greater in 1 mm dia tube

- (C) Greater in 0.5 mm dia tube

- (D) Zero in both the tubes

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