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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