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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Fluid Mechanics for Mechanical Engineering  >  Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Mechanical Engineering MCQ

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Mechanical Engineering MCQ


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10 Questions MCQ Test Fluid Mechanics for Mechanical Engineering - Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation for Mechanical Engineering 2024 is part of Fluid Mechanics for Mechanical Engineering preparation. The Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation below.
Solutions of Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation questions in English are available as part of our Fluid Mechanics for Mechanical Engineering for Mechanical Engineering & Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation solutions in Hindi for Fluid Mechanics for Mechanical Engineering course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation | 10 questions in 25 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Fluid Mechanics for Mechanical Engineering for Mechanical Engineering Exam | Download free PDF with solutions
Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 1
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Calculate the magnitude of capillary effect in millimeters in a glass tube of 7mm diameter, when immersed in mercury. The temperature of the liquid is 25℃ and the values of surface tension of mercury at 25℃ is 0.51 N/m. The angle of contact for mercury is 130°.

Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 1

Explanation: Capillarity rise or fall
h=4*cosθ*σ/ρ*g*d
=4*cos130*0.51/13600*9.81*0.007
=140 mm.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 2
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Determine the minimum size of glass tube that can be used to measure water level if the capillary rise in the tube is restricted to 5mm. Consider surface tension of water in contact with air as 0.073 N/m

Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 2

Explanation: d=4*cosθ*σ/ρ*g*h
=4*1*0.073/1000*9.81*0.005
=5.95mm.

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Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 3
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An oil of vicosity 7 poise is used for lubrication between shaft and sleeve. The diameter of shaft is 0.6 m and it rotates is 360 rpm. Calculate the power lost in oil for a sleeve length of 160mm. The thickness of oil film is 1.0mm

Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 3

Explanation: Power lost= torque * angular velocity
= force* radius* angular velocity
= shear stress * area* radius* angular velocity
Shear Stress = viscosity* velocity gradient
Power lost= 7916.8*3.142*0.3*0.3*0.3*2*3.142*60
= 25.31 kW.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 4
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 Find the capillarity rise or fall if a capillary tube of diameter .03m is immersed in hypothetical fluid with specific gravity 6.5, surface tension 0.25 N/m and angle of contact 147°.
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 4

Explanation: h=4*cosθ*σ/ρ*g*d
=4*cos147*0.25/6.5*1000*9.81*0.03
=-0.44 mm i.e 0.44 mm fall.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 5
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Will capillary rise occur and if it occurs what will be capillary rise if glass capillarity tube is immersed in water and experiment is carried out by astronauts in space.
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 5

Explanation: Capillary rise is given by
h=4*cosθ*σ/ρ*g*d
hence rise is inversely proportional to g
In space g is 0 m/s2
Hence, capillarity rise will occur finitely and will be the whole length of tube.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 6
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The surface tension of fluid in contact with air at 25℃ is 0.51N/m. The pressure inside a droplet is to be 0.05 N/cm2 greater than outside pressure. Determine the diameter of the droplet of water.
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 6

Explanation: P=4*σ/d
d= 4*.51/500
=4.08 mm.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 7
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 If a fluid of certain surface tension and diameter is used to create a soap bubble and a liquid jet. Which of the two, bubble or liquid jet, will have greater pressure difference on the inside and outside.
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 7

Explanation: For soap bubble,
P=8*σ/d
For liquid jet,
P=2*σ/d
Hence, soap bubble will be having more pressure difference.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 8
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Capillarity fall is reduced if we take the appartus (capillary tube immersed in fluid having acute angle of contact) considerable distance inside the earth( i.e below the earth crust).
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 8

Explanation: Capillary rise is given by
h=4*cosθ*σ/ρ*g*d
Inside the earth, g (acceleration due to gravity) decreases. Hence, capillary rise will increase compared to that on the earth’s surface.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 9
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 For liquid fluids will capillarity rise (or fall) increase or decrease with rise in temperature.
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 9

Explanation: Capillary rise is given by
h=4*cosθ*σ/ρ*g*d
As temperature increases, σ(surface tension) decreases. Therefore, correspondingly rise(or fall) will decrease as their is direct proportional relation between the two.

Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 10
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Cavitation is more pronounced in rough pipes than smooth surfaced pipes.
Detailed Solution for Test: Surface Tension, Capillarity, Vapour Pressure & Cavitation - Question 10

Explanation: Rough surfaced pipes have more friction with the fluid and hence possibility of cavitation is more pronounced.

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