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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:-
Answer : DDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ A wooden piece floats half submerged in a tub of water. If the system is transferred to a lift ascending, with acceleration the wooden piece will

Sink a little more

Rise a little

Remain half submerged

Will sink to the bottom

⇒ A barometer is used to measure

Very low pressure

Very high pressure

Pressure difference between two points

Atmospheric pressure

⇒ 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.

⇒ The discharge over a broad crested weir is maximum when the depth of flow is.

H/3

H/2

2 H/5

2 H/3

⇒ In a fluid flow the line of constant piezometric head passes through two points which have the same

Elevation

Pressure

Velocity

Velocity potential

⇒ If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then

the pressure throughout the liquid mass is atmospheric

there will be vacuum in the liquid

the pressure in the liquid mass is greater than hydrostatic pressure

none of the above

⇒ When a loaded boat enters into the sea from a river. it rises because

There is more water in sea than in river

Sea water is denser than river

There is difference of temperature

Sea is deeper than river

⇒ An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to.

g/3

g/2

2g/3

g

⇒ The generation of hydroelectric power as compared to power generated by coal, oil etc. is

Cheaper

Costlier

At par

Can not compare

⇒ The major loss of energy in long pipes is due to.

sudden enlargement

sudden contraction

gradual contraction or enlargement

friction

⇒ Froude number is the ratio of inertia force to

Pressure force

Viscous force

Gravity force

Elastic force

⇒ Pascal-second is the unit of

pressure

kinematic viscosity

dynamic viscosity

surface tension

⇒ 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)

⇒ When a body is weighed in a liquid, the loss in its weight depends upon

Volume of the body

Mass of the body

Shape of the body

CG of the body

⇒ A wooden cylinder floats vertically in water with half of its length immersed. The density of wood is

Equal to that of water

Half the density of water

Double the density of water

The question is incomplete

⇒ An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

g/3

g/2

2g/3

g

⇒ Two pieces of metal when immersed in a liquid have equal upthrust on them, then

Both pieces must have equal weig.hts

Both pieces must have equal densities

Both pieces must have equal volumes

Both are floating to the same depth

⇒ The hydraulic grade line is

always above the centre line of pipe

never above the energy grade line

always sloping downward in the direction of flow

all of the above

⇒ 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)

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

x

x/2

x/3

x/7

⇒ The velocity of the liquid flowting through the divergent portion of a venturimeter

Remains constant

Increases

Decreases

Depends upon mass of liquid

⇒ The principle of operation of Brahma's press is based on

Boyle's law

Pascal's law

Dalton's law

Newton's law

⇒ Coefficient of velocity for Borda's mouth piece running full is

0.611

0.707

0.855

1.00

⇒ The maximum thickness of boundary layer in a pipe of radius r is

0

r/2

r

2r

⇒ Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The nature of the liquid

The acceleration due to gravity at that point

The shape of the containing vessel

⇒ When the depth of flow changes abruptly over a short distance, then the flow will be termed as

Rapidly varied flow

Unsteady flow

Gradually varied flow

Turbulent flow

⇒ Two pipe systems are said to be equivalent when

head loss and discharge are same in two systems

length of pipe and discharge are same in two systems

friction factor and length are same in two systems

length and diameter are same in two systems

⇒ A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is.

zero

one-fourth its value when cylinder was full

one-half its value when cylinder was full

cannot be predicted from the given data

⇒ For laminar flow in a pipe of circular cross-section, the Darcy's friction factor f is

directly proportional to Reynolds number and independent of pipe wall roughness

directly proportional to pipe wall roughness and independent of Reynolds number

inversely proportional to Reynolds number and indpendent of pipe wall roughness

inversely proportional to Reynolds number and directly proportional to pipe wall roughness

⇒ The discharge through a V- notch varies as.

H1/2

H3'2

H5/2

H5'4 where H is head.