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ESE ME 2018: Fluid Mechanics Achievers National Test
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Question 1
The velocity of flow from a tap of 12 mm diameter is 8 m/s. What is the diameter of the jet at 1.5 m from the tap when the flow is vertically upwards? Assuming that, the jet continues to be circular upto that level.
Question 2
What is the ratio of displacement thickness to boundary layer thickness for a linear distribution of velocity 
in the boundary layer on a flat plate, where δ is the boundary layer thickness and u∞ is the free steam velocity?
in the boundary layer on a flat plate, where δ is the boundary layer thickness and u∞ is the free steam velocity? Question 3
Assertion (A) : The 'dimples' on a golf ball are intentionally provided.
Reason (A) : A turbulent boundary layer, since it has more momentum than a laminar boundary layer, can better resist an adverse pressure gradient.
Reason (A) : A turbulent boundary layer, since it has more momentum than a laminar boundary layer, can better resist an adverse pressure gradient.
Question 4
A ship’s model with scale 1:100, has a wave resistance of 10 N at its design speed. What is the corresponding proptotype wave resistance in KN ?
Question 5
A penstock pipe of 10 m diameter carries water under a pressure head of 100 m. If the wall thickness is 9 mm, what is the tensile stress in the pipe wall in MPa?
Question 6
The components of rotation for a three-dimensional flow field
At (1, 2, 3) are
At (1, 2, 3) are
Question 7
Which one of the following statements is correct for the velocity potential?
Question 8
The pressure in Pascal corresponding to 3 cm column of Mercury is
Question 9
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A. Lubricantion
B. Rise of water in trees
C. Formation of droplets
D. Cavitation
Lists-II
1. Capillary
2. Vapour pressure
3. Viscosity
4. Surface tension
List-I
A. Lubricantion
B. Rise of water in trees
C. Formation of droplets
D. Cavitation
Lists-II
1. Capillary
2. Vapour pressure
3. Viscosity
4. Surface tension
Question 10
The specific speed of a pump is defined as the speed of the unit of such a size that it
Question 11
What is the vertical component of pressure force on submerged curved surface equal to?
Question 12
Whenover a plate is submerged at an angle with the direction of flow of liquid, it is subjected to some pressure. What is the component of this pressure in the direction of flow of liquid, known as?
Question 13
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6 what fraction of its volume is under mercury?
Question 14
Consider the following statements related to the fluid properities:
1) Vapour pressure of water at 373K is 101.5
103 N/m2.
2) Capillary height in cm for water in contact with glass tube and air is (tube diameter )/0.268
3) Blood is a Newtonian fluid.
Which of these statements is/are correct?
1) Vapour pressure of water at 373K is 101.5
103 N/m2. 2) Capillary height in cm for water in contact with glass tube and air is (tube diameter )/0.268
3) Blood is a Newtonian fluid.
Which of these statements is/are correct?
Question 15
For laminar flow through a round pipe, the shear stress ___________.
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