- A. 22.5 m/sec.
- B. 33 m/sec.
- C. 40 m/sec.
- D. 90 m/sec.
Hydraulics and Fluid Mechanics
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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_____.
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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
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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
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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
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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
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Stream lines and path lines always coincide in case of_____.
- A. steady flow
- B. laminar flow
- C. uniform flow
- D. turbulent flow
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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
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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
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Center of pressure on an inclined plane is_____.
- A. at the centroid
- B. above the centroid
- C. below the centroid
- D. at metacentre
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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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