Laminar and turbulent flow Quiz 1

Question 1

If the rate of flow of liquid in a tube of radius 5 cm is reduced to 1/16th then the new radius of tube will be-$$($$assume no turbulence occurs in tube$$)$$

Accepted Answer

2.5 cm

Answer

3 cm

Answer

5 cm

Answer

1.5 cm

Question 2

A fluid of viscosity coefficient $$\eta =0.6 Ns/{{m}^{2}}$$ and relative density $$\rho =1500kg/{{m}^{2}}$$ flowing through a narrow tube of diameter 50 mm and velocity 5 m/s. The value of Reynolds number will be-

Accepted Answer

625

Answer

525

Answer

500

Answer

600

Question 3

If an spherical ball of radius $$R$$, density $$\rho $$ is falling in a liquid of density $$\dfrac{\rho }{3}$$ and viscosity coefficient $$\eta $$ with terminal velocity $${{V}_{1}}$$, second ball of radius $$2R$$ and density $$2\rho $$ is falling in a liquid of density $$\rho $$ and viscosity coefficient $$2\eta $$ with terminal velocity $${{V}_{2}}$$ and third ball of radius $$R/2$$ , density $$3\rho $$ is falling in a liquid of density $$\rho $$ and coefficient of viscosity $$3\eta $$ with terminal velocity $${{V}_{3}}$$ . The correct relation between three terminal velocities will be-

Accepted Answer

$${{V}_{2}}>{{V}_{1}}>{{V}_{3}}$$

Answer

$${{V}_{1}}>{{V}_{2}}>{{V}_{3}}$$

Answer

$${{V}_{3}}>{{V}_{2}}>{{V}_{1}}$$

Answer

$${{V}_{1}}>{{V}_{3}}>{{V}_{2}}$$

Question 4

A fluid of viscosity coefficient $$\eta =0.5\,{Ns}/{{{m}^{2}}}$$ and relative density $$\rho =1300kg/{{m}^{2}}$$ flowing through a narrow tube of diameter 0.8 m and velocity 3 m/s. The type of flow of fluid will be-

Accepted Answer

Turbulent

Answer

Laminar

Answer

Can’t say

Answer

both (a) and (b)

Question 5

A man is running for an hour, due to which his blood flow increases to 5 times as initial rate.The blood’s viscosity is reduced to 80 % of initial value and the pressure difference across the arteries increased by 70 %. The change in radius of artery will be-

Accepted Answer

1.2 times

Answer

1.8 times

Answer

2.0 times

Answer

remains same