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Q1. | In which of the following the friction drag is generally larger than pressure drag? |

A. | a circular disc or plate held normal to flow [Wrong Answer] |

B. | a sphere [Wrong Answer] |

C. | a cylinder [Wrong Answer] |

D. | an airfoil [Correct Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is

32 km

20 km

8 km

4 km

⇒ The increase in meta centric height

i) increases stability

ii) decreases stability

iii) increases comfort for passengers

iv) decreases comfort for passengers

The correct answer is

(i) and (iii)

(i)and(iv)

(ii) and (iii)

(ii) and (iv)

⇒ In series-pipe problems.

the head loss is same through each pipe

the discharge is same through each pipe

a trial solution is not necessary

the discharge through each pipe is added to obtain total discharge

⇒ In order to avoid cavitation the upstream edge of broad crested weir should have

Rounded corner

Sharp corner

Parabolic corner

None of these

⇒ When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies.

linearly with radial distance

as the square of the radial distance

inversely as the square of the radial distance

inversely as the radial distance

⇒ The pitot tube is used to measure

velocity at stagnation point

stagnation pressure

static pressure

dynamic pressure

⇒ As compared to laminar flow, in turbulent flow, boundary layers will be

Thinner

Thicker

Same

Half

⇒ A body in neutral equilibrium will rotate about

Centre of gravity and metacentre

Centre of pressure and metacentre

Centre of gravity and centre of buoyancy

Centre of gravity, centre of buoyancy and metacentre

⇒ Pressure is applied to an enclosed fluid. It is

Increased and applied to every part of the fluid

Diminished and transmitted to the walls of the container

Increased in proportion to the mass of the fluid and then transmitted

Transmitted unchanged to every portion of the fluid and the walls of container

⇒ The pitot tube is used to measure.

velocity at stagnation point

stagnation pressure

static pressure

dynamic pressure

⇒ If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as

x

x

x

x/7

⇒ Select the incorrect statement.

The pressure intensity at vena contracta is atmospheric.

Contraction is least at vena contracta.

Stream lines are parallel throughout the jet at vena contracta.

Coefficient of contraction is always less than one.

⇒ Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by

5%

10%

15%

20%

⇒ The wake

always occurs before a separation point

always occurs after a separation point

is a region of high pressure intensity

none of the above

⇒ As compared to flat plate force of jet on a semi-circular vane will be

Half

Equal

Double

Triple

⇒ Flow in a pipe is laminar if the Reynold's number is

Less than 2000

Between 2000 and 4000

Between 4000 and 6000

Equal to 10000

⇒ A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of

3.75 m

4.0 m

4.2m

4.5m

⇒ A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be.

less than 1 m/sec

1 m/sec

1.5 m/sec

2 m/sec

⇒ When an ideal fluid flows past a sphere

Total drag is zero

Minimum pressure occurs at rear stagnation point

Minimum pressure occurs at front stagnation point

None of the above

⇒ Laminar sublayer is a thin boundary layer, formed just adjacent to the boundary in

Turbulent flow

Laminar flow

Transition flow

Compressible

⇒ The force exerted by jet on vane is determined by

Energy conservation principle

Momentum principle

Continuity equation

None of the above

⇒ In case of an airfoil, the separation of flow occurs

at the extreme rear of body

at the extreme front of body

midway between rear and front of body

any where between rear and front of body depending upon Reynolds number

⇒ The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

center of gravity

center of buoyancy

center of pressure

metacentre

⇒ The eddy viscosity for turbulent flow is.

a function of temperature only

a physical property of the fluid.

dependent on the flow

independent of the flow

⇒ For laminar flow in circular pipes, the Darcy's friction factor f is equal to

16/Re

32/ Re

64/ Re

none of the above where R,, is Reynolds number.

⇒ Which of the following statements is correct?

Lower critical Reynolds number is of no practical significance in pipe flow problems.

Upper critical Reynolds number is significant in pipe flow problems.

Lower critical Reynolds number has the value 2000 in pipe flow

Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.

⇒ Stanton diagram is a.

log-log plot of friction factor against Reynolds number

log-log plot of relative roughness against Reynolds number

semi-log plot of friction factor against Reynolds number

semi-log plot of friction factor against relative roughness

⇒ The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is

laminar flow

transition flow

turbulent flow

not predictable from the given data

⇒ The velocity distribution for laminar flow through a circular tube.

is constant over the cross-section

varies linearly from zero at walls to maximum at centre

varies parabolically with maximum at the centre

none of the above

⇒ In series-pipe problems

the head loss is same through each pipe

the discharge is same through each pipe

a trial solution is not necessary

the discharge through each pipe is added to obtain total discharge