# Practice Test: Question Set - 09

**1. The distribution of shear stress in a stream of fluid in a circular tube is**

- (A) Linear with radius for turbulent flow only

- (B) Linear with radius for laminar flow only

- (C) Linear with radius for both laminar &
turbulent flow

- (D) Parabolic with radius for both laminar &
turbulent flow

**2. Foot valves are provided in the suction line of a centrifugal pump to**

- (A) Avoid priming, every time we start the pump

- (B) Remove the contaminant present in the liquid

- (C) Minimize the fluctuation in discharge

- (D) Control the liquid discharge

**3. Which of the following is dimensionless?**

- (A) Angular velocity

- (B) Fanning friction factor

- (C) Specific volume

- (D) None of these

**4. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?**

- (A) 0.5

- (B) 1

- (C) 1.5

- (D) 2

**5. A floating/submerged body is always stable, if its center of gravity**

- (A) Lies above its center of buoyancy

- (B) And center of buoyancy coincide

- (C) Lies below its center of buoyancy

- (D) Lies above its metacenter

**6. In case of end to end connection of two or more pipes in series, the __________ each pipe.**

- (A) Same rate of flow passes through

- (B) Head loss is same through

- (C) Rate of flow in each pipe is proportional to the length of

- (D) Total flow rate is the sum of flow rate in

**7. Boundary layer separation is caused by the**

- (A) Reduction of pressure below vapor pressure

- (B) Reduction of pressure gradient to zero

- (C) Adverse pressure gradient

- (D) Reduction of boundary layer thickness to zero

**8. The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is ___________ the mean velocity of flow.**

- (A) Directly proportional to

- (B) Directly proportional to square of

- (C) Inversely proportional to

- (D) Inversely proportional to square of

**9. Which of the following conditions must be satisfied for lift force to be developed?**

- (A) The body should be bluff body

- (B) The body should be stream lined

- (C) Circulation around the body is essentially required

- (D) The main stream velocity must approach the velocity of sound in that
fluid medium

**10. Existence of boundary layer in fluid flow is because of the**

- (A) Surface tension

- (B) Fluid density

- (C) Fluid viscosity

- (D) Gravity forces

**11. Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.**

- (A) < 4

- (B) > 4

- (C) > 12.5

- (D) < 10

**12. Pick out the correct statement pertaining to Venturimeter.**

- (A) A Venturimeter with a fixed pressure drop discharges more, when the
flow is vertically downward, than when the flow is vertically upward

- (B) The co-efficient of contraction of a Venturimeter is always unity

- (C) For a fixed pressure drop, the discharge of a gas through a
Venturimeter is greater, when compressibility is taken into account, than when
it is neglected

- (D) None of these

**13. Diaphragm valves are used for handling __________ fluids.**

- (A) Corrosive

- (B) Viscous

- (C) Non-Newtonian

- (D) Solid suspended

**14. The continuity equation of fluid mechanics utilizes the principle of conservation of**

- (A) Momentum

- (B) Mass

- (C) Energy

- (D) Both (b) & (c)

**15. Vane anemometer**

- (A) Is an area meter

- (B) Is a variable head meter

- (C) Rotates an element at a speed determined by the velocity of the
fluid in which the meter is immersed

- (D) None of these

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