# Practice Test: Question Set - 45

**1. Hydraulic intensifier is used for increasing the**

- (A) Rate of velocity of liquid supply

- (B) Rate of flow through delivery pipeline of a pump

- (C) Intensity of pressure of the liquid

- (D) Momentum rate through delivery pipe

**2. One dimensional fluid flow implies the**

- (A) Flow in straight lines only

- (B) Uniform flow

- (C) Steady uniform flow

- (D) Flow in which transverse components are zero

**3. The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where,**

*x*= each side of the square duct).- (A)

*x*

- (B) √(Ï€

*x*)

- (C) √(2

*x*)

- (D) √(

*x*/2)

**4. For laminar flow through a closed conduit**

- (A) V

_{max}= 2V

_{av}

- (B) V

_{max}= V

_{av}

- (C) V

_{max}= 1.5V

_{av}

- (D) V

_{max}= 0.5V

_{av}

**5. The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is**

- (A) 0.5

- (B) 1

- (C) 2

- (D) 0.66

**6. Each term in Bernoulli’s equation represents the __________ of the fluid.**

- (A) Energy per unit mass

- (B) Energy per unit weight

- (C) Force per unit mass

- (D) None of these

**7. Nature of fluid flow during the opening of a valve in a pipeline is**

- (A) Laminar

- (B) Unsteady

- (C) Steady

- (D) Uniform

**8. For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is**

- (A) More

- (B) Less

- (C) Equal

- (D) Independent of porosity

**9. Capacity of a hydraulic accumulator is defined in terms of maximum**

- (A) Amount of energy stored

- (B) Flow rate through accumulator

- (C) Rate of falling of ram

- (D) Volume available in the cylinder

**10. The nominal size of a hose pipe is specified by its**

- (A) I.D.

- (B) O.D.

- (C) Thickness

- (D) None of these

**11. The continuity equation in ideal fluid flow states that**

- (A) Net rate of inflow into any small volume must be zero

- (B) Energy is not constant along a streamline

- (C) Energy is constant along a streamline

- (D) There exists a velocity potential

**12. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides '**

*x*' & '*y*' is given by- (A) 2

*xy*/(

*x*+

*y*)

- (B)

*xy*/(

*x*+

*y*)

- (C) (

*x*+

*y*)/2

*xy*

- (D) (

*x*+

*y*)/

*xy*

**13. With increase in the temperature, viscosity of a liquid**

- (A) Increases

- (B) Decreases

- (C) Remain constant

- (D) May increase or decrease; depends on the liquid

**14. An equipotential line is __________ to the velocity vector at every point.**

- (A) Normal

- (B) Parallel

- (C) Tangential

- (D) None of these

**15. The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is**

- (A) Hyperbolic

- (B) Parabolic

- (C) Linear

- (D) None of these

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