## Fluid Mechanics Problems

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**INSTRUCTIONS**

**1.**This question paper will be fully objective type for a total of 50 marks divided into four groups.

- Question number 1 to 10 will carry 1 mark each
- Question number 11 to 24(16 questions) will carry 2 marks each.

C.Question number 25 to 28(Common data questions) will carry 2 marks each.

**2.**Wrong answers carry 33% negative mark.

**3.**In Q.1 to Q.10 1/3 mark will be deducted for each wrong answer and in Q.11 to Q.28, 2/3rd mark will be deducted for each answer.

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- Answered
- Review

- Question 1 of 28
##### 1. Question

1 pointsThe hydrostatic force on one side of a submerged surface of unit area with centroid 3m below the free surface of the liquid is

CorrectThe Answer is Correct

IncorrectThe Answer is wrong

- Question 2 of 28
##### 2. Question

1 pointsOne pipe system is said to be equivalent to another when the following quantifies are the same

CorrectThe Answer is correct

IncorrectThe Answer is wrong

- Question 3 of 28
##### 3. Question

1 pointsThe pressure at the throat of Venturimeter is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 4 of 28
##### 4. Question

1 pointsSurface tension of a fluid is zero

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 5 of 28
##### 5. Question

1 pointsA fluid is said to be the irrotational when

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 6 of 28
##### 6. Question

1 pointsThe normal stress is the same on all the planes at any point in a fluid only when the fluid is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 7 of 28
##### 7. Question

1 pointsA 1:10 Reduced scale model of a water turbine runs at the same speed as the prototype turbine.The ratio of Prototype to model turbine discharges should be

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 8 of 28
##### 8. Question

1 pointsAll the terms of Bernoulli’s equation:(ρ/r)+(V2/2g)+Z =Constant have the units of

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 9 of 28
##### 9. Question

1 pointsThe power dissipated in a light loaded viscous fluid lubricated bearing at ‘N’ r.p.m. is 1 kilowatt.The power dissipated at 2N r.p.m. would be

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 10 of 28
##### 10. Question

1 pointsThe thickness of laminar boundary layer on that plate is 2 cm at x = L/2.The thickness at x = L is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 11 of 28
##### 11. Question

2 pointsA plane lamina in the form of a hollow circle of outer and inner diameters 2 m and 1 m respectively is immersed in a liquid of specific gravity 0.878 such that its extreme edges are at depths of 1.20 m and 2.2 m below the free surface.The hydrostatic force on one side of lamina,in KN is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 12 of 28
##### 12. Question

2 pointsThe velocity field in a 3-D is given by

u=-x;v=2y and w=(3-z).The equation of the stream line that passes through a point (1,1,1) isCorrectIncorrect - Question 13 of 28
##### 13. Question

2 pointsTwo pipes carrying water and Nitro-benzene are connected by a Mercury differential gauge as shown in figure.The difference in pressure (P1-P2),in kPa is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 14 of 28
##### 14. Question

2 pointsThe change in moment of momentum of fluid due to flow along with curved path results in

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 15 of 28
##### 15. Question

2 pointsA Bush Bearing of length 30 cm and diameter 18.01 cm supports a shaft of 18 cm diameter. The shaft rotates at 36.65 rad/sec.The viscosity of the lubricant is 1.96 poise.The Power dissipated in the bearing,in kW,is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 16 of 28
##### 16. Question

2 pointsA metal ball weight 9 kN in air and 7.5 kN in a fluid of specific gravity 0.75,then specific gravity of ball material is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 17 of 28
##### 17. Question

2 pointsIn a straight uniform pipe,the discharge is reduced from 1001 p.s. to zero in 10 seconds.The cross section area of the pipe is 200 Sq.cm.The nature and value of acceleration is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 18 of 28
##### 18. Question

2 pointsPick out the dimensionless parameter

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 19 of 28
##### 19. Question

2 pointsA Pitot-tube measures

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 20 of 28
##### 20. Question

2 pointsAll the terms of Bernoulli’s equation:(ρ/r)+(V2/2g)+Z =Constant have the units of

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 21 of 28
##### 21. Question

2 pointsIf (ϕ) = xy m2/sec,the resultant velocity at point (1,1) in m/sec is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 22 of 28
##### 22. Question

2 pointsThe shear stress in a fluid is given according Fluid Power(Rheological) equation

Tow = 0.08(du/dy)Power(0.8).How is the Fluid Classified?CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 23 of 28
##### 23. Question

2 pointsAssuming that the Kinematic viscosity of water is 1 Centistokes at room temperature,then the maximum permissible pipe diameter for maintaining laminar flow with an average velocity of 1m/s is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 24 of 28
##### 24. Question

2 pointsCrude oil of specific gravity 0.82 to is pumped through a pipe of 150 mm diameter at the rate of 10 litres per second with a pressure gradient of 0.1 kPa/m.The type of flow is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 25 of 28
##### 25. Question

2 pointsTwo pipes one of 100 mm diameter,0.2 km long and another of 150 mm diameter,0.4 Km long are connected in parallel.The friction factors are 0.0075 for the smaller pipe and 0.006 for the large pipe.The total discharge through the system is 50 Lit/sec.The head in smaller diameter pipe is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 26 of 28
##### 26. Question

2 pointsTwo pipes one of 100 mm diameter,0.2 km long and another of 150 mm diameter,0.4 Km long are connected in parallel.The friction factors are 0.0075 for the smaller pipe and 0.006 for the large pipe.The total discharge through the system is 50 Lit/sec.The equivalent length of a 200 mm diameter by having friction factor of 0.005 is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 27 of 28
##### 27. Question

2 pointsThe nozzle of a pelton wheel gives Jet of 90 mm diameter and velocity of 75 m/sec.Velocity coefficient of nozzle is 0.978.The PCD of wheel is 1.5 m and water deflection angle of bucket is 170 degrees the wave velocity is 0.46 times the jet velocity.The shaft torque developed by pelton wheel is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong

- Question 28 of 28
##### 28. Question

2 pointsThe nozzle of a pelton wheel gives Jet of 90 mm diameter and velocity of 75 m/sec.Velocity coefficient of nozzle is 0.978.The PCD of wheel is 1.5 m and water deflection angle of bucket is 170 degrees the wave velocity is 0.46 times the jet velocity. The efficiency of the Turbine is

CorrectThe Answer is Correct

IncorrectThe Answer is Wrong