 A. 22.5 m/sec.
 B. 33 m/sec.
 C. 40 m/sec.
 D. 90 m/sec.
Hydraulics and Fluid Mechanics

In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_____.

A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
 A. 4 minutes
 B. 4 x (225)3/2 minutes
 C. 4 (225)1/3 minutes
 D. 4 x (225)1/2 minutes

A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be
 A. less than 1 m/sec
 B. 1 m/sec
 C. 1.5 m/sec
 D. 2 m/sec

According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_____.
 A. the weight of the body
 B. more than the weight of the body
 C. less than the weight of the body
 D. weight of the fluid displaced by the body

Coefficient of velocity of venturimeter _____.
 A. is independent of Reynolds number
 B. decreases with higher Reynolds number
 C. is equal to the coefficient of discharge of venturimeter
 D. none of the above

Stream lines and path lines always coincide in case of_____.
 A. steady flow
 B. laminar flow
 C. uniform flow
 D. turbulent flow

The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to_____.
 A. 0.1
 B. 0.01
 C. 0.001
 D. 0.0001

The difference of pressure between the inside and outside of a liquid drop is_____.
 A. (a)p = Txr
 B. (b)p = T/r
 C. p = T/2r
 D. (d)p = 2T/r

Center of pressure on an inclined plane is_____.
 A. at the centroid
 B. above the centroid
 C. below the centroid
 D. at metacentre

When an ideal fluid flows past a sphere_____.
 A. highest intensity of pressure occurs around the circumference at right angles to flow
 B. lowest pressure intensity occurs at front stagnation point
 C. lowest pressure intensity occurs at rear stagnation point
 D. total drag is zero
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