Test: Properties of Fluids & Turbulent Flow in Pipes - 1

# Test: Properties of Fluids & Turbulent Flow in Pipes - 1

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## 20 Questions MCQ Test RRB JE for Mechanical Engineering | Test: Properties of Fluids & Turbulent Flow in Pipes - 1

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 for Mechanical Engineering 2022 is part of RRB JE for Mechanical Engineering preparation. The Test: Properties of Fluids & Turbulent Flow in Pipes - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Properties of Fluids & Turbulent Flow in Pipes - 1 MCQs are made for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 below.
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Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 1

### The SI unit of kinematic viscosity (ν) is:

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 2

### For a Newtonian fluid

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 2

Ans. (c)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 3

### The dimensions of surface tension is:

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 3

Ans. (c) The property of the liquid surface film to exert a tension is called the surface tension. It is the force required to maintain unit length of the film in equilibrium. In Sl units surface tension is expressed in

In metric gravitational system of units it is expressed in kg(f)/cm or kg(f)/m.

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 4

Assertion (A): In a fluid, the rate of deformation is far more important than the total deformation it self.
Reason (R): A fluid continues to deform so long as the external forces are applied.

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 4

Ans. (a) This question is copied from Characteristics of fluid
1. It has no definite shape of its own, but conforms to the shape of the containing vessel.
2. Even a small amount of shear force exerted on a fluid will cause it to undergo a deformation which continues as long as
the force continues to be applied.
3. It is interesting to note that a solid suffers strain when subjected to shear forces whereas a fluid suffers Rate of Strain i.e. it flows under similar circumstances.

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 5

What is the unit of dynamic viscosity of a fluid termed 'poise'equivalent to?

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 5

Ans. (c)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 6

The shear stress in turbulent flow is:

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 6

Ans. (b)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 7

While water passes through a given pipe at mean velocity V the flow isfound to change from laminar to turbulent. If another fluid of specificgravity 0.8 and coefficient of viscosity 20% of that of water, is passed  through the same pipe, the transition of flow from laminar to turbulentis expected if the flow velocity is:

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 7

Ans. (d) Rew =

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 8

Flow takes place and Reynolds Number of 1500 in two different pipes with relative roughness of 0.001 and 0.002. The friction factor

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 8

Ans. (c) The flow is laminar (friction factor,
) it is not depends on roughness but for turbulent flow it will be higher for higher relative roughness.

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 9

The shear stress developed in lubricating oil, of viscosity 9.81poise, filled between two parallel plates 1 cm apart and moving with relative velocity of 2 m/s is:

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 9

Ans. (b) du=2 m/s; dy= 1cm = 0.01 m;
μ = 9.81 poise = 0.981 Pa.s
Therefore (ζ) = μ = 0.981 ×
= 196.2 N/m2

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 10

An oil of specific gravity 0.9 has viscosity of 0.28 Strokes at 380C.What will be its viscosity in Ns/m2

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 10

Ans. (c) Specific Gravity = 0.9 therefore Density = 0.9 × 1000 =900 kg/m3
One Stoke = 10-4 m2/s
Viscosity (μ) = ρν
= 900 × 0.28 × 10-4 = 0.0252 Ns/m2

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 11

Assertion (A): In general, viscosity in liquids increases and ingases it decreases with rise in temperature.  Reason (R): Viscosity is caused by inter molecular forces of cohesion and due to transfer of molecular momentum between fluid layers; of which in liquids the former and in gases the later contribute the major part towards viscosity.

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 11

Viscosity is higher in liquids than gases as the temperature increases. It will certainly change its state to gas and so the viscosity will decrease. The reason is true it is due to the friction between fluid layers.

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 12

If the Relationship between the shear stress ζ and the rate of shear strain  is expressed as then the fluid with exponent n>1 is known as which one of the following?

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 12

Ans. (b)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 13

Match List-I with List-II and select the correct answer.

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Ans. (d)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 14

What is the pressure difference between inside and outside of adroplet of water?
Where 'σ' is the surface tension and’d’ is the diameter of the droplet.

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 14

Ans. (b) Pressure inside a water droplet,

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 15

The pressure drop in a 100 mm diameter horizontal pipe is 50 kPa overa length of 10m. The shear stress at the pipe wall is:

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 15

Ans. (b)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 16

Reynolds stress may be defined as the

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 16

Ans. (c) Reynolds stress may be defined as additional shear stresses due to fluctuating velocity components in a turbulent flow.

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 17

As the transition from laminar to turbulent flow is induced a cross flowpast a circular cylinder, the value of the drag coefficient drops.

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 17

Ans. (b) For turbulent flow total shear stress (ζ) =

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 18

In turbulent flow over an impervious solid wall

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Ans. (d)

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 19

If the surface tension of water-air interface is 0.073 N/m, thegauge pressure inside a rain drop of 1 mm diameter will be:

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 19

Ans. (d) P =

Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 20

A capillary tube is inserted in mercury kept in an open container.Assertion (A): The mercury level inside the tube shall rise above the level of mercury outside.
Reason (R): The cohesive force between the molecules of mercury is greater than the adhesive force between mercury and glass.

Detailed Solution for Test: Properties of Fluids & Turbulent Flow in Pipes - 1 - Question 20

Ans. (d) Mercury shows capillary depression.

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## RRB JE for Mechanical Engineering

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