# Practice Test: Question Set - 41

**1. Manometers measure the __________ pressure.**

- (A) Vacuum as well as the atmospheric

- (B) Difference in

- (C) Absolute

- (D) Gage

**2. Path followed by water jet issuing from the bottom of a water tank will be a**

- (A) Parabola (vertex being at the opening)

- (B) Hyperbola

- (C) Horizontal straight line

- (D) Zig-zag path (which is geometrically undefined)

**3. Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid**

- (A) Lies above the centroid of the plane surface

- (B) Is independent of the specific weight of the fluid

- (C) Is different for different fluids

- (D) Is at the centroid of the plane surface

**4. For flow past a flat plate, if ‘**

*x*’ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to- (A) √

*x*

- (B) 1/√

*x*

- (C)

*x*

- (D) 1/

*x*

**5. Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter '**

*d*'- (A)

*d*

- (B) 0.5

*d*

- (C) 2

*d*

- (D) 4

*d*

**6. The unit of bulk modulus of elasticity for a liquid in S.I. unit is**

- (A) N

- (B) N/m

- (C) N/m

^{2}

- (D) N/m

^{3}

**7. A special type of liquid transporting device is the diffuser pump, in which __________ are minimized.**

- (A) Bearing losses

- (B) Disk friction

- (C) Shock losses

- (D) Cavitation

**8. It is possible to integrate an automatic flow controller to a**

- (A) Flow nozzle

- (B) Venturimeter

- (C) Rotameter

- (D) None of these

**9. For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by**

- (A) √(2

*gh*)

- (B)

*C.V.*√(2

*gh*)

- (C)

*C*√(2

_{d}*gh*)

- (D)

*C*√(2

_{c}*gh*)

**10. Friction factor for a hydraulically smooth pipe at N**

_{Re}= 2100 is f_{1}. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of N_{Re}, will- (A) Increase

- (B) Decrease

- (C) Remain unchanged

- (D) Increase or decrease depending on the pipe material

**11. Specific speed of a centrifugal pump relates it with another pump having the**

- (A) Dynamic similarity

- (B) Same efficiency

- (C) Same speed

- (D) Geometrical similarity

**12. The dimension of surface tension is**

- (A) ML

^{-2}

- (B) MT

^{-2}

- (C) MLT

^{-2}

- (D) ML

^{-2}T

**13. Isotropic turbulence occurs**

- (A) Where there is no velocity gradient

- (B) At higher temperatures

- (C) Only in Newtonian fluids

- (D) None of these

**14. N. second/m**

^{2}is- (A) The S.I. unit of dynamic viscosity

- (B) The S.I. unit of kinematic viscosity

- (C) Equivalent to one poise

- (D) Equivalent to one stoke

**15. A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?**

- (A) Inertial and drag forces are important

- (B) Drag, gravitational and buoyancy forces are
important

- (C) Drag force and gravitational forces are important

- (D) None of the above

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