# Practice Test: Question Set - 17

**1. Potential flow is the flow of**

- (A) Compressible fluids with shear

- (B) Compressible fluids with no shear

- (C) Incompressible fluids with shear

- (D) Incompressible fluids with no shear

**2. The buoyant force acting on a floating body is dependent on the**

- (A) Viscosity of the liquid

- (B) Weight of the liquid displaced

- (C) Depth of immersion of the body

- (D) Surface tension of the liquid

**3. Weber number is the ratio of inertial force to __________ force.**

- (A) Surface tension

- (B) Gravity

- (C) Viscous

- (D) Elastic

**4. Which of the following is used for pumping crude oil from oil well?**

- (A) Single stage centrifugal pump

- (B) Gear pump

- (C) Screw pump

- (D) Duplex/triplex reciprocating pump

**5. In case of Couette flow, the fluid flow is between two large flat parallel plates with**

- (A) Top plate moving and the bottom plate fixed

- (B) Bottom plate moving and the top plate fixed

- (C) Both the plates fixed

- (D) Both the plates moving

**6. A stream line is**

- (A) Fixed in space in steady flow

- (B) Always the path of particle

- (C) Drawn normal to the velocity vector at every point

- (D) A line connecting the mid points of flow cross-section

**7. Dimension of kinematic viscosity is**

- (A) MLT

^{-1}

- (B) L

^{2}T

^{-1}

- (C) L

^{2}T

- (D) L

^{2}T

^{-2}

**8. Froude number is the ratio of**

- (A) Shear stress to gravitational stress

- (B) Drag stress to shear stress

- (C) Inertial stress to shear stress

- (D) Inertial stress to gravitational stress

**9. Multistage compressors are used in industry, because they**

- (A) Reduce the cost of compressor

- (B) Reduce the size requirement

- (C) Resemble closely to isothermal compression

- (D) Are easy to control

**10. Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter.**

- (A) Two

- (B) Three

- (C) Four

- (D) Eight

**11. Hydraulic __________ works on the principle of Pascal's law of transmission of fluid pressure.**

- (A) Press

- (B) Turbine

- (C) Pump

- (D) Coupling

**12. Propeller type centrifugal pumps are most suitable for**

- (A) High capacity at high heads

- (B) High capacity at low heads

- (C) Low capacity at high heads

- (D) Low capacity at low heads

**13. The discharge through a semi-circular weir varies as (where, H = Head of liquid.)**

- (A) H

- (B) H

^{2}

- (C) H

^{3/2}

- (D) H

^{1/2}

**14. Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?**

- (A) < 0.3

- (B) > 3

- (C) 50

- (D) 1

**15. Which of the following exemplifies a three dimensional fluid flow?**

- (A) Fluid flow at the inlet to a nozzle

- (B) Fluid flow between parallel plates

- (C) Viscous fluid flow between converging plates

- (D) None of these

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