# Practice Test: Question Set - 06

**1. What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter '**

*D*' & length '*L*' incurring a pressure drop 'Δ*p*' with average velocity '*V*'?_{avg}- (A)

*D*Δ

*p*/8

*L*

- (B)

*D*Δ

*p*/4

*L*

- (C) 8

*V*/

_{avg}*D*

- (D) 4

*V*/

_{avg}*D*

**2. Function of air vessel provided in a reciprocating pump is to**

- (A) Reduce discharge fluctuation

- (B) Reduce the danger of cavitation

- (C) Avoid the necessity of priming

- (D) Increase the pump efficiency

**3. Low specific speed of a pump implies that, it is a/an __________ pump.**

- (A) Axial flow

- (B) Centrifugal

- (C) Mixed flow

- (D) None of these

**4. For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is**

- (A) 0.5

- (B) 1

- (C) 0.66

- (D) < 0.5

**5. Actual lift of a pump is always less than the theoretical lift and is limited by the**

- (A) Specific gravity & temperature of the liquid

- (B) Leakage & pressure decreasing at higher elevations

- (C) Frictional resistance through pipes, fittings & passages

- (D) All (a), (b) and (c)

**6. In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is**

- (A) 0.44

- (B) 0.044

- (C) 4.4

- (D) 44

**7. Mach number is the ratio of the speed of the**

- (A) Fluid to that of the light

- (B) Light to that of the fluid

- (C) Fluid to that of the sound

- (D) Sound to that of the fluid

**8. In parallel pipe problems, the**

- (A) Head loss is the same through each pipe

- (B) Discharge is the same through all the pipes

- (C) Total head loss is equal to the sum of the head losses through each
pipe

- (D) None of these

**9. What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes?**

- (A) Rotation

- (B) Translation

- (C) Linear deformation

- (D) Angular deformation

**10. A tube is specified by its**

- (A) Thickness only

- (B) Outer diameter only

- (C) Thickness & outer diameter both

- (D) Inner diameter

**11. In a fluidized bed reactor**

- (A) Temperature gradients are very high

- (B) Temperature is more or less uniform

- (C) Hot spots are formed

- (D) Segregation of the solids occurs

**12. Poise is converted into stoke by**

- (A) Multiplying with density (gm/c.c)

- (B) Dividing by density (gm/c.c)

- (C) Multiplying with specific gravity

- (D) Dividing by specific gravity

**13. For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the**

- (A) Square of the radial distance

- (B) Radial distance linearly

- (C) Inverse of the radial distance

- (D) Elevation along vertical direction

**14. Slurries can be most conveniently pumped by a __________ pump.**

- (A) Screw

- (B) Reciprocating

- (C) Gear

- (D) Centrifugal

**15. For a given fluid flow rate, which of the following incurs maximum head loss?**

- (A) Orificemeter

- (B) Venturimeter

- (C) Flow nozzle

- (D) All of them incur the same head loss

**View All Answers**

**Next Tests:**