Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | In an incompressible fluid, the density is |

A. | greatly affected by moderate changes in pressure. [Wrong Answer] |

B. | greatly affected only by moderate changes in temperature. [Wrong Answer] |

C. | not affected with moderate change in temperature & pressure. [Correct Answer] |

D. | sensible to changes in both temperature & pressure. [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 :**

⇒ Deformation drag, which is caused by widespread deformation of fluid around the immersed body

occurs when N

_{Re}is very small.

is primarily a friction drag.

is independent of body length.

depends mainly on cross-sectional shape.

⇒ Euler's equation of motion states, that at every point, the

fluid momentum is constant.

force per unit mass equals acceleration.

rate of mass outflow is equal to the rate of mass inflow.

none of these.

⇒ If the discharge of a centrifugal pump is throttled, then its suction lift

increases

decreases

remains unchanged

data insufficient to predict

⇒ The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

inlet tip of a blade curves in a direction opposite to that

outlet tip of a blade curves in a direction opposite to that

inlet tip of a blade is towards the direction

outlet tip of a blade is towards the direction

⇒ Centrifugal compressors compared to reciprocating compressors

require less space.

have quieter operation.

have lower operating costs.

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

⇒ The ratio of width to depth for the most economical rectangular section in open channel flow is

0.5

1

1.5

2

⇒ Pick out the wrong statement.

Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces.

A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces.

In case of unsteady fluid flow, the velocity at any given point does not change with time.

Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point.

⇒ Various efficiencies of a centrifugal pump are related as (where, η

_{m}= mechanical efficiency η

_{v}= volumetric efficiency. η

_{ma}= manometric efficiency η

_{o}= overall efficiency)

η

_{ma}x η

_{m}x η

_{v}= η

_{o}

η

_{m}= η

_{v}. η

_{ma}

η

_{ma}= η

_{m}x η

_{v}

η

_{v}= η

_{m}x η

_{ma}

⇒ A fluid element has a velocity V = -y

^{2}. xi + 2yx

^{2}. j. The motion at (x, y) = (l/2, 1) is

rotational and incompressible

rotational and compressible

irrotational and compressible

irrotational and incompressible

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

0

1

< 1

> 1

⇒ The pressure intensity is the same in all directions at a point in a fluid

only when the fluid is frictionless.

only when the fluid is at rest having zero velocity.

when there is no motion of one fluid layer relative to an adjacent layer.

regardless of the motion of one fluid layer relative to an adjacent layer.

⇒ Which is the most efficient and best for measuring very small flow rate of gases ?

Venturimeter

Orifice meter

Rotameter

Flow nozzle

⇒ The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is

0.1

0.5

0.94

1

⇒ Pick out the wrong statement pertaining to fluid flow.

The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5.

The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe.

Navier-Stokes equation is applicable to the analysis of viscous flows.

Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids.

⇒ Priming is needed in a __________ pump.

reciprocating

gear

centrifugal

diaphragm

⇒ When a fluid flows over a solid surface, the

velocity is uniform at any cross-section.

velocity gradient is zero at the solid surface.

resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves.

velocity is not zero at the solid surface.

⇒ Centrifugal pumps as compared to reciprocating pumps

run at a lower speed for the same discharge.

do not need priming.

deliver fluid with pulsating/fluctuating discharge.

can be run with discharge line valve closed for a short interval.

⇒ Which of the following is used for very accurate measurement of flow of gas at low velocity ?

Pitot tube

Rotameter

Segmental orificemeter

Hot wire annemometer

⇒ The schedule number of a pipe is an indication of its

size

roughness

material density

wall thickness

⇒ In isotropic turbulence, the __________ are equal to each other.

temporal velocity components

mean square of velocity fluctuations in the three co-ordinate directions

root mean square of velocity fluctuations in the three co-ordinate directions

none of these

⇒ The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is

0.5

1

2

0.33

⇒ While starting a centrifugal pump, its delivery valve should be kept

opened.

closed.

either opened or closed ; it does not make any difference.

either opened or closed; depending on the fluid viscosity.

⇒ The ratio of inertial forces to elastic forces is called the __________ number.

Reynolds

Mach

Euler

Weber

⇒ It is possible to integrate an automatic flow controller to a

flow nozzle

venturimeter

rotameter

none of these

⇒ For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of

2

<2

>2

42737

⇒ Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?

Decrease in effect

Increase in thrust

Develops noise

Develops high pressure

⇒ The temperature in isentropic flow

does not depend on Mach number.

depends on Mach number only.

cannot drop and then increase again downstream.

none of these.

⇒ In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.

inverse

square root

second power

first power

⇒ Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?

Head & discharge

Length & discharge

Length & diameter

Friction factor & diameter.

⇒ Purpose of hydraulic accumulator is to

ensure intermittant supply of hydraulic pressure.

increase the pressure and store/ accumulate it.

accumulate pressure to increase force.

generate high pressure to operate hydraulic machines like cranes, lifts, presses etc