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Q1. | Which of the following conditions must be satisfied for lift force to be developed ? |

A. | The body should be bluff body. [Wrong Answer] |

B. | The body should be stream lined. [Wrong Answer] |

C. | Circulation around the body is essentially required. [Correct Answer] |

D. | The main stream velocity must approach the velocity of sound in that fluid medium. [Wrong Answer] |

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

⇒ The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as

evaporation

cavitation

sublimation

stripping

⇒ Fanning friction factor for laminar flow of fluid in a circular pipe is

not a function of the roughness of pipe wall.

inversely proportional to Reynolds number.

both (a) & (b).

neither (a) nor (b).

⇒ The discharge through a semi-circular weir varies as (where, H = Head of liquid.)

H

H

^{2}

H

^{3/2}

H

^{1/2}

⇒ Which of the following properties of a fluid is responsible for offering resistance to shear ?

Surface tension.

Viscosity.

Specific gravity.

All (a), (b), and (c).

⇒ The unit of dynamic viscosity in SI unit is

kg/m . sec

N/m

^{2}

m

^{2}/sec.

m/N. sec.

⇒ The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is.....the mean velocity of flow.

directly proportional to

directly proportional to square of

inversely proportional to

inversely proportional to square of

⇒ Which of the following assumptions enables the Euler's equation of motion to be integrated ?

The fluid is incompressible.

The fluid is non-viscous.

The continuity equation is satisfied.

The flow is rotational and incompressible.

⇒ Gear pump

is a positive displacement pump.

is a centrifugal pump.

is a non-positive displacement pump.

can be started with delivery valve closed.

⇒ Capacity of a rotary gear pump can be varied by

changing the speed of rotation.

bleeding air into suction.

bypassing liquid from the suction or discharge line.

all (a), (6) and (c).

⇒ Non-colloidal solution is an example of the __________ fluid.

non-Newtonion

Newtonion

dilatent

pseudoplastic

⇒ Which of the following is an undesirable property of a manometric liquid ?

Non-sticky & non-corrosive nature.

High vapour pressure.

Low viscosity & surface tension.

Low co-efficient of thermal expansion.

⇒ Reynolds number is the ratio of

viscous forces to gravity forces.

inertial forces to viscous forces.

viscous forces to inertial forces.

inertial forces to gravity forces.

⇒ Pascal law is not applicable for a/an __________ fluid.

accelerating frictionless

static

uniformly moving

none of these

⇒ A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).

less head & capacity

more head

more capacity

less head & more capacity

⇒ For a reciprocating pump, the indicator diagram is the graph between the

discharge and overall efficiency.

volume swept by piston for one complete revolution and the pressure in the cylinder.

angle swept by the crank pin at any instant and the discharge.

none of these.

⇒ In case of supersonic flow of a fluid through pipeline, the 'Mach number' is

0

1

< 1

> 1

⇒ If the head over the triangular notch is doubled, the discharge will increase by __________ times.

2

2.828

5.657

4

⇒ Select the correct practical example of steady non-uniform flow.

Motion of water around a ship in a lake.

Motion of river around bridge piers.

Steadily decreasing flow through a reducing section.

Steadily increasing flow through a pipe.

⇒ Pick out the wrong statement:

The vacuum pressure is always the negative gauge pressure.

The pressure of the liquid measured by a piezometer tube is the gauge pressure.

Manometric liquid should have high surface tension.

The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity.

⇒ Which is the correct relationship for a centrifugal pump ? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

D = 1840 H

^{0.5}/N

D = 1840 N/H

^{0.5}

H = 1840 D

^{0.5}/N

D = 1840 H/N

⇒ For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

directly as square of gas density.

directly as gas density.

directly as square root of gas density.

inversely as gas density.

⇒ Critical velocity in a pipe flow

increases as fluid viscosity increases.

increases as pipe diameter increases.

independent of fluid density.

none of these.

⇒ One stoke (unit of kinematic viscosity) is equivalent to

1 cm

^{2}/second

1 m

^{2}/second

1 gm/cm. second

1 kg . m/second

⇒ An equipotential line is __________ to the velocity vector at every point.

normal

normal

tangential

none of these

⇒ Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

smaller than

larger than

same as

twice

⇒ The value of critical Reynolds number for pipe flow is

1300

10000

100,s000

none of these.

⇒ In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is

0.5

0.84

1.84

1.25

⇒ During ageing of fluid carrying pipes, the

pipe becomes smoother with use.

friction factor increases linearly with time.

absolute roughness decreases with time.

absolute roughness increases linearly with time.

⇒ Fanning friction factor equation applies to the __________ fluid flow.

non-isothermal condition of

compressible

both (a) and (b)

neither (a) nor (b)

⇒ The line of action of the buoyant force passes through the centre of gravity of the

submerged body.

displaced volume of the fluid.

volume of fluid vertically above the body.

horizontal projection of the body.