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Fluid Mechanics (Chapter 11)

Total questions: 165

Worksheet time: 1hrs 23mins

Name
Class
Date
1.

For supersonic flow, the pressure of fluid must decrease as the fluid flow area of the duct

a)

increases

b)

remain the same

c)

decreases

d)

none of these

2.

Density in terms of viscosity is ______.

a)

kinematic viscosity / dynamic viscosity

b)

dynamic viscosity / kinematic viscosity

c)

kinematic viscosity × dynamic viscosity

d)

none of these

3.

Liquids and gases take the following characteristic(s) of their contents.

a)

Volume

b)

Shape and volume

c)

Shape

d)

Neither shape nor volume

4.

Alcohol finds use in manometers as ______.

a)

it provides a suitable meniscus for the inclined tube

b)

its density being less can provide longer length for a pressure difference, thus more accuracy can be obtained

c)

A and B above are correct

d)

Cheap and easily available

5.

Which of the following statements about a Newtonian fluid is most accurate?

a)

Shear stress is proportional to strain

b)

Viscosity is zero

c)

Shear stress is multi-valued

d)

Shear stress is proportional to rate of strain

6.

For the submerged plane surface, what do you call the point on the surface where the resultant force acts?

a)

Center of buoyancy

b)

center of pressure

c)

Center of gravity

d)

center of attraction

7.

What principle which states that "at any point in fluid at rest, the pressure is the same in all directions".

a)

Bernoulli Principle

b)

Pascal's Law

c)

Archimedes Principle

d)

Torricelli's Law

8.

The hot-wire manometer is used to measure:

a)

pressure in gasses

b)

pressure in liquids

c)

wind velocities at airports

d)

gas velocities

9.

The pitot static tube measures ______.

a)

the static pressure

b)

the gage pressure

c)

the total pressure

d)

the dynamic pressure

10.

The terminal velocity of a small sphere setting in a viscous fluid varies as the ______.

a)

first power of its diameter

b)

inverse of fluid viscosity

c)

inverse square of the diameter

d)

inverse of the diameter

11.

The normal stress is the same in all directions at a point in fluid ______.

a)

independent of the motion of one fluid layer relative to an adjacent layer

b)

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

c)

only if the fluid is frictionless

d)

only if fluid is frictionless and incompressible

12.

Which of the following is not a characteristic of fluid pressure?

a)

It is the same in all directions at a point in the fluid

b)

It acts normal to a surface

c)

It is a shear stress

d)

It is linear with depth

13.

The length of mercury column at a place at an altitude will change with respect to that at ground in:

a)

a linear relation

b)

a parabolic relation

c)

will remain constant

d)

first slowly and then steeply

14.

All of the following dimensionless parameters are applicable to fluid flow problems except the ______.

a)

Reynolds number

b)

Froude number

c)

Mach number

d)

Biot number

15.

Mass density of liquid (ρ) is given by which of the following?

a)

ρ = Mass / volume

b)

ρ = metricslug/m2metric slug / m^2

c)

ρ = kgsec2/m4kg sec^2 / m^4

d)

all of these

16.

The speed of sound in all fluid is most closely related to all of the following properties except ______.

a)

compressibility

b)

bulk modulus

c)

density

d)

thermal conductivity

17.

Under which condition, the specific weight of water is 1000kg/m31000 kg/m^3 ?

a)

at normal pressure of 760 mm

b)

at 4°C temperature

c)

at mean sea level

d)

all of these

18.

All of the following can be characteristics of fluids except ______.

a)

kinematic viscosity

b)

bulk modulus

c)

surface tension

d)

hysteresis

19.

Which of the following can be used to measure the flow of water in a pipe of diameter 3000 mm?

a)

Venturimeter

b)

Nozzle

c)

Rotameter

d)

Pitot tube

20.

The pressure at a given depth due to several immiscible liquids is ______.

a)

the sum of the hydrostatic pressure contributions of each liquid layer

b)

the arithmetic average of the individual layer pressures

c)

equal to the maximum pressure among the layers

d)

independent of the densities of the layers

21.

The pilot static tube measures ____.

a)

the static pressure

b)

the total pressure

c)

the gage pressure

d)

the dynamic pressure

22.

The pressure coefficient is the ratio of pressure forces to ____.

a)

viscous forces

b)

gravity forces

c)

inertia forces

d)

surface tension force

23.

Tranquil flow must always occur ____.

a)

above the normal depth

b)

above the critical depth

c)

below the normal depth

d)

below the critical depth

24.

Which of the following head loss coefficient among the following types of entrance?

a)

bell mouth

b)

reentrant

c)

square edge

d)

it depends

25.

On dynamic similitude the relation which represents the ratio of inertia force to pressure force is ____.

a)

Froude number

b)

Euler number

c)

Cauchy number

d)

Reynolds number

26.

The equation of continuity of flow is applicable if ____.

a)

the flow is one dimensional

b)

the flow is steady

c)

the flow is uniform over the cross-section

d)

all of the above conditions are together

27.

Uniform flow takes place when ____.

a)

conditions remain unchanged with time at any point

b)

rate change of velocity of fluid is zero

c)

at every point, the velocity vector is identical in magnitude and direction for any given instant

d)

the change in transverse direction is zero

28.

The continuity equation of an ideal fluid flow ____.

a)

states that the net rate of inflow into any small volume must be zero

b)

applies to irrotational flow only

29.

A pitot tube can be used to measure fluid velocity as described by the Bernoulli's equation and the ____ relationship between ____.

a)

kinetic energy and static pressure

b)

fluid pressure and height

c)

total pressure and impact energy

d)

pressure and momentum

30.

In order to avoid vaporization in the pipe line, the pipe line over the ridge is laid in such a way that it is not more than ____.

a)

2.4 m above the hydraulic gradient

b)

6.4 m above the hydraulic gradient

c)

10.0 m above the hydraulic gradient

d)

5.0 m above the hydraulic gradient

31.

What is the maximum velocity in a sewer flowing full?

a)

0.6 m/sec

b)

1.2 m/sec

c)

0.9 m/sec

d)

1.8 m/sec

32.

Which is not a physical characteristics of water?

a)

total, suspended and dissolved solids

b)

turbidity

c)

color

d)

hardness

33.

The velocity of fluid is zero at the wall and maximum at the center because of the ____.

a)

velocity effect

b)

temperature effect

c)

viscous effect

d)

none of these

34.

As the air passes through a nozzle, which of the following will increase?

a)

temperature

b)

internal energy

c)

enthalpy

d)

Mach number

35.

The locus of points where condensation will take place regardless of the initial temperature and pressure at the nozzle entrance.

a)

Fanno line

b)

Willan line

c)

Rayleigh line

d)

Wilson line

36.

The stream function is a useful parameter in describing ____.

a)

the conservation of mass

b)

conservation of momentum

c)

the conservation of energy

d)

the equation of state

37.

For high speed flows, the potential energy of the fluids are ____.

a)

positive

b)

negligible

c)

negative

d)

none of these

38.

McLeod gauge used for low pressure measurement operates on the principle of ____.

a)

Gas law

b)

Charles law

c)

Boyle's law

d)

Pascal's law

39.

The most common method for calculating frictional energy loss for laminar flowing fluids in noncircular pipes is ____.

a)

the Darcy equation

b)

the Hagen–Poiseuille equation

c)

the Hazen–Williams equation

d)

the Swamee–Jain equation

40.

The parameter f in the expression for head-loss is

a)

the fraction of flow that is totally turbulent

b)

the Darcy friction factor

c)

the height of the roughness scale in turbulent flow

d)

the static coefficient of friction

41.

Friction factor for both laminar and turbulent flows can be found plotted in a

a)

steam table

b)

psychrometric chart

c)

Moody diagram

d)

Mollier diagram

42.

Which of the following is relative velocity?

a)

The difference between two velocities

b)

Average velocity

c)

Sum of two velocities

d)

Vector difference of two velocities

43.

Which of the following is the highest head?

a)

33 inch Hg

b)

31.0 ft. water

c)

1.013 kg/cm2

d)

75.0 cm of Hg

44.

For stable equilibrium of floating body its metacenter should lie:

a)

below the center of gravity

b)

below the center of buoyancy

c)

above the center of buoyancy

d)

above the center of gravity

45.

Center of pressure on an inclined plane lies

a)

at the centroid

b)

above the centroid

c)

below the centroid

d)

at metacenter

46.

The line of action of the buoyant forces always acts through the centroid of the

a)

submerged body

b)

volume of the floating body

c)

volume of the fluid vertically above the body

d)

displaced volume of the fluid

47.

The hydraulic grade line of a pipeline denotes which of the following?

a)

Total energy

b)

Pressure energy

c)

Potential energy

d)

The sum of pressure energy and potential energy

48.

The energy grade line of a pipeline denotes which of the following?

a)

Total energy

b)

Pressure energy

c)

Potential energy

d)

The sum of pressure energy and potential energy

49.

The presence of friction in the energy grade line will always cause the line to slope

a)

down in the direction of the flow

b)

upward in the direction of the flow

c)

level (no slope)

d)

there is no effect of friction on the energy grade line

50.

The pitot tube is a device used for measurement of

a)

pressure

b)

velocity

c)

flow

d)

discharge

51.

Hydrometer is used to find out

a)

specific gravity of liquids

b)

specific gravity of solids

c)

specific gravity of gases

d)

relative humidity

52.

The fluid forces taken into consideration in the Navier Stokes equation are

a)

gravity, pressure and viscous

b)

gravity, pressure and turbulent

c)

pressure, viscous and turbulent

d)

gravity, viscous and turbulent

53.

Permissible velocity of water flowing through concrete tunnel, is generally

a)

4-5 m/s

b)

13-16 m/s

c)

10-12 m/s

d)

20 m/s

54.

Orifice refers to an opening

a)

with closed perimeter and of regular form through which water flows

b)

with prolonged sides having length of 2 to 3 diameters of opening in thick wall

c)

with partially full flow

d)

in hydraulic structure with regulation provision

55.

The value of coefficient of discharge in comparison to coefficient of velocity is found to be

a)

more

b)

less

c)

same

d)

more/less depending on flow

56.

Power transmitted through a pipe is maximum when the loss of head due to friction is

a)

one-half of the total head supplied

b)

one-third of the total head supplied

c)

one-fourth of the total head supplied

d)

equal to the total head supplied

57.

In a nozzle if back pressure is same as inlet pressure; then

a)

no flow takes place

b)

maximum flow takes place

c)

flow becomes subsonic in diverging section

d)

flow becomes supersonic in converging as well as supersonic section

58.

The flow on two sides of a normal shock wave is called

a)

sonic

b)

sub-sonic

c)

supersonic

d)

supersonic on one side and sub-sonic on the other side

59.

Which of the following is NOT a characteristic of fluid pressure?

a)

It is a shear stress

b)

It is the same in all directions at a point in the fluid

c)

It acts normal to a surface

d)

It is linear with depth

60.

Refers to the compressibility of a fluid; the fractional change in fluid volume per unit change in pressure.

a)

Viscosity

b)

Bulk modulus

c)

Density

d)

Pressure

61.

A pitot tube can be used to measure fluid velocity as described by the Bernoulli equation and the relationship between _____.

a)

kinetic energy and static pressure

b)

fluid pressure and static pressure

c)

fluid pressure and impact energy

d)

pressure and momentum

62.

The ratio of the area to the wetted perimeter is known as _____.

a)

flow factor

b)

hydraulic radius

c)

Kutter’s C

d)

value of k in Darcy–Weisbach formula

63.

What is the coefficient of contraction?

a)

The ratio of the area of vena contracta to the area of the orifice

b)

The ratio of actual discharge to the theoretical discharge

c)

The ratio of the actual velocity to the theoretical velocity

d)

The ratio of the effective head to the actual head

64.

Where is vena contracta most likely located?

a)

At the orifice

b)

At a distance approximately 1/2 the diameter of the orifice

c)

At a distance approximately equal to the diameter of the orifice

d)

At a distance approximately twice the diameter of the orifice

65.

A substance that is able to flow and yields to any force tending to change its shape without changing its volume such as water and air.

a)

Fluid

b)

Flux

c)

Gas oil

d)

Water gas

66.

The velocity of a fluid particle at the center of the pipe section is _____.

a)

maximum

b)

minimum

c)

average

d)

logarithmic average

67.

For supersonic flow, the pressure of fluid must increase as the fluid flow area of the duct _____.

a)

increases

b)

decreases

c)

constant

d)

none of these

68.

Which is incorrect statement regarding apparent shear forces.

a)

It can never be found in frictionless fluid regardless of its motion

b)

It can never be found when the fluid is at rest

c)

It depends upon cohesive forces

d)

It may occur owing to cohesion when the fluid is at rest

69.

SI unit of viscosity is _____.

a)

10 times poise

b)

9.81 times poise

c)

1/9.81 times poise

d)

1/10 times poise

70.

For computation convenience, fluids are usually classed as _____.

a)

rotational or irrotational

b)

real or ideal

c)

laminar or turbulent

d)

Newtonian or non-Newtonian

71.

Which of the following is not a dimensionless parameter?

a)

Kinetic viscosity

b)

Weber number

c)

Darcy–Weisbach friction factor

d)

Froude number

72.

Which of the following is not a characteristic of real fluids?

a)

Finite viscosity

b)

Non-uniform velocity distributions

c)

Compressibility

d)

Experience of eddy currents and turbulence

73.

Which of the following is not the mass density of water?

a)

62.5 lbm/ft^3

b)

100 kg/m^3

c)

1 g/cm^3

d)

1 kg/L

74.

The upper critical Reynolds number for pipe flow is _____.

a)

of no practical importance to designers

b)

always used to design pipes for strength

c)

the number at which turbulent flow changes over to laminar flow

d)

the number at which laminar flow changes into turbulent flow

75.

Which of the following statements about gauge pressure is most correct? Gauge pressure are measured relative to _____.

a)

atmospheric pressure

b)

a vacuum

c)

each other

d)

the surface

76.

The volumetric change of the fluid caused by a resistance is called.

a)

volumetric strain

b)

volumetric index

c)

compressibility

d)

adhesion

77.

Compressibility of a fluid relates the fractional change in fluid volume per unit change in fluid.

a)

temperature

b)

density

c)

pressure

d)

viscosity

78.

How do you call the property of a fluid whereby its own molecules are attracted?

a)

adhesion

b)

cohesion

c)

surface tension

d)

viscosity

79.

The term subsonic flow refers to a flowing gas with a speed.

a)

less than the local speed of sound

b)

equal to the speed of sound

c)

greater than the speed of sound

d)

much greater than the speed of sound

80.

The pressure at a point in a fluid will not be same in all the directions if the fluid is.

a)

viscous

b)

viscous and static

c)

inviscous and in motion

d)

viscous and is in motion

81.

The statement that "the hydrostatic pressure a fluid exerts on an immersed object or on container walls is a function only of fluid depth" is.

a)

the perfect gas law

b)

D'Alembert's paradox

c)

the hydrostatic paradox

d)

Boyle's law

82.

Bernoulli's equation is s/an.

a)

momentum equation

b)

conservation of energy equation

c)

conservation of mass equation

d)

equation of state

83.

An ideal fluid is one that.

a)

is very viscous

b)

obeys Newton's law of viscosity

c)

is assumed in problems in conduit flow

d)

is frictionless and incompressible

84.

The relationship between pressure and altitude in the atmosphere is given by the.

a)

perfect gas law

b)

conservation of mass

c)

barometric height relationship

d)

first law of thermodynamics

85.

The fact the buoyant force on a floating object equal to the weight of the water displaced is.

a)

Bernoulli's law

b)

Archimedes' principle

c)

The law of diminishing returns

d)

The conservation of mass

86.

Which of the following terms does not appear in the steady flow energy equation (the extended Bernoulli's equation)?

a)

Kinetic energy

b)

Potential energy

c)

Friction losses

d)

Hysteresis losses

87.

Neglecting the forces due to inertia, gravity and frictional resistance, the design of a channel can be made by comparing.

a)

Weber number

b)

Froude's number

c)

Reynolds number

d)

Prant'l number

88.

The difference between stagnation pressure and total pressure is.

a)

due to height difference

b)

due to fluid kinetic energy

c)

none of the terms are interchangeable

d)

important only in supersonic flow

89.

Fully turbulent flow in a pipe is characterized by all of the following except.

a)

a parabolic velocity profile

b)

a momentum exchange due to fluid masses rather than molecules

c)

a maximum velocity at the fluid center line

d)

a 1/7 velocity profile

90.

The laminar friction factor of fluid flowing through a pipe is a function of all of the following except.

a)

fluid velocity

b)

pipe roughness

c)

pipe diameter

d)

Reynolds number

91.

The continuity equation is applicable to.

a)

viscous non-viscous fluids

b)

compressibility of fluids

c)

conservation of mass

d)

steady unsteady flow

92.

The rise or fall of head 'h' in a capillary tube of diameter 'd' and liquid surface tension 's' and specific weight 'w' is given by.

a)

4s/wd

b)

4wd/s

c)

4ds/w

d)

4ws/d

93.

The study of the practical laws of fluid flow and the resistance of open pipes and channels.

a)

fluid mechanics

b)

aerodynamics

c)

hydraulics

d)

thermodynamics

94.

Which of the following turbine is different from the others?

a)

Fourneyron turbine

b)

Kaplan turbine

c)

Francis turbine

d)

Pelton wheel

95.

Running away speed of a Pelton wheel gives.

a)

actual operating speed

b)

no load speed

96.

The characteristic length of the Reynold's number used to calculate the friction in noncircular full running pipes is based on the _____.

a)

run length

b)

pipe length

c)

hydraulic diameter (the equivalent diameter)

d)

wetted circumference

97.

The hydraulic radius of noncircular pipe is _____.

a)

the square root of the flow area

b)

the ratio of the area to the wetted perimeter

c)

the radius of a pipe of equivalent area

d)

none of these

98.

The Darcy equation can be used for all liquids and flows except _____.

a)

water

b)

alcohol

c)

gasoline

d)

air flowing supersonically

99.

The Hazen–Williams formula for head loss due to friction is based upon _____.

a)

rigorous mathematical derivation

b)

empirical data

c)

semi-empirical analysis

d)

serendipity

100.

The extended Bernoulli equation includes all of the following terms except _____.

a)

potential energy

b)

kinetic energy

c)

nuclear energy

d)

friction losses

101.

An equipotential line is one that _____.

a)

has no velocity component tangent to it

b)

has uniformly varying dynamic pressure

c)

has no velocity component normal to it

d)

exists in case of rotational flow

102.

What is the use of a Hydraulic jump?

a)

increase the flow rate

b)

reduce the flow rate

c)

reduce the velocity of flow

d)

reduce the energy of flow

103.

What do you call the lowest portion to storage basin from where the water is not drawn?

a)

bottom storage

b)

spring reserve

c)

sub soil storage

d)

dead storage

104.

The presence of friction in the hydraulic grade line will always cause the line to slope _____.

a)

down in the direction of the flow

b)

upward in the direction of the flow

c)

level (no slope)

d)

there is no effect of friction on the energy grade line

105.

The presence of a minor loss in the energy grade line will cause the line to slope _____.

a)

down in the direction of the flow

b)

upward in the direction of the flow

c)

vertically downward

d)

there is no effect of friction on the energy grade line

106.

What do you call the pressure which the fluid exerts on an immersed object or container walls?

a)

Normal pressure

b)

Standard liquid pressure

c)

Hydrostatic pressure

d)

Gage pressure

107.

Viscosity for a fluid is defined as the constant of proportionality between shear stress and what other variable?

a)

The spatial derivative of velocity

b)

The time derivative of pressure

c)

The time derivative of density

d)

The spatial derivative of density

108.

What is the classification of the fluid flow if the fluid travels parallel to the adjacent layers and the paths of the individual particles do not cross each other?

a)

Steady flow

b)

Uniform flow

c)

Laminar flow

d)

Turbulent flow

109.

Which of the following refers to the measure of a fluid's sensitivity to changes in viscosity with changes in temperature?

a)

Viscosity index

b)

Viscosity ratio

c)

Coefficient of viscosity

d)

Viscosity factor

110.

If the Mach number is greater than 1 but lesser than 5, what is the standard classification of the travel?

a)

Transonic travel

b)

Hypersonic travel

c)

Subsonic travel

d)

Supersonic travel

111.

What is measured by a Pitot tube?

a)

Volumetric discharge

b)

Pressure

c)

Mass flow

d)

Velocity

112.

What is the difference between the energy grade line and the hydraulic grade line?

a)

potential energy

b)

kinetic energy

c)

pressure energy

d)

friction losses

113.

Kinetic energy is not neglected in calculations of _____.

a)

high speed flow

b)

steady flow

c)

low speed flow

d)

equilibrium flow

114.

Discharge losses through orifice are due to _____.

a)

friction losses

b)

minor losses

c)

both friction and minor losses

d)

pressure losses

115.

Which of the following is considered as an important parameter in the study of compressible flow?

a)

speed of fluid

b)

speed of light

c)

speed of sound

d)

speed of fluid flow

116.

Which of the following is the basic of Bernoulli's law for fluid flow?

a)

Continuity equation

b)

Principle of conservation of energy

c)

Fourier's law

d)

Principle of conservation of mass

117.

Is the velocity at which an infinitesimal small pressure wave travels through a medium.

a)

Subsonic velocity

b)

Sonic velocity

c)

Hypersonic velocity

d)

Monatomic velocity

118.

It is the ratio of the actual velocity of the fluid to the velocity of sound.

a)

Mach number

b)

Sonic number

c)

Froude number

d)

Euler number

119.

The flow is called sonic when Mach number is ____.

a)

equal to 1

b)

more than 1

c)

less than 1

d)

none of these

120.

What is the Mach number for a subsonic flow?

a)

greater than 1

b)

more than 1

c)

less than 1

d)

none of these

121.

The flow is supersonic when Mach no. is ____.

a)

greater than zero

b)

greater than 1

c)

less than 1

d)

none of these

122.

The flow is transonic when ____.

a)

M = 0

b)

M > 1

c)

M < 1

d)

M = 1

123.

The pressure decreases as the temperature and velocity increases while the fluid velocity and Mach number:

a)

increases

b)

remains constant

c)

decreases

d)

none of these

124.

The Mach number is unity or one at the location of smallest flow area called the ____.

a)

decreasing area

b)

increasing area

c)

throat

d)

none of these

125.

What happens to the velocity of fluid after passing the throat although the flow area?

a)

increases rapidly

b)

remains constant

c)

decreases rapidly

d)

none of these

126.

Which of the following is an example of a Newtonian fluid?

a)

Motor oils

b)

Paints

c)

Gas

d)

Clay slurries

127.

What is the critical pressure of water?

a)

150 kg/cm^3

b)

less than 200 kg/cm^2

c)

more than 200 kg/cm^2

d)

100 kg/cm^2

128.

The volumetric change of the fluid caused by a resistance is called ____.

a)

volumetric change

b)

volumetric index

c)

compressibility

d)

adhesion

129.

The energy of a fluid flowing at any section in a pipeline is a function of ____.

a)

velocity of flow only

b)

pressure only

c)

height above a chosen datum, density, internal energy, pressure and velocity of flow

d)

pressure, height above a chosen datum, velocity of flow, density of fluid

130.

If the fluid travels parallel to the adjacent layers and the paths of individual particles do not cross, the fluid is said to be ____.

a)

Turbulent

b)

Dynamic

c)

Critical

d)

Laminar

131.

Center of pressure on an inclined plane lies ____.

a)

at the centroid

b)

below the centroid

c)

above the centroid

d)

at the metacenter

132.

At any instant, if the number of particles passing every cross-section of the stream is the same, the flow is said to be ____.

a)

steady flow

b)

continuous flow

c)

uniform flow

d)

laminar flow

133.

The ratio of cross-sectional area of flow to the wetted perimeter is ____.

a)

hydraulic lead

b)

hydraulic mean depth

c)

hydraulic section

d)

hydraulic gradient

134.

If A is the cross-sectional area of the flow and Pw is the wetted perimeter of a pipe, then what is the hydraulic depth, Hd?

a)

Pw − A

b)

A / Pw

c)

Pw / A

d)

Pw × A

135.

If Q is the volume in gallon; D is height or elevation in ft, and m is weight in lbs per gallon, what is the desired energy to lift the water from lower to higher elevation?

a)

E = mD/Q

b)

E = mDQ

c)

E = mQ/D

d)

E = QD/m

136.

The flow of the convergent section of a nozzle is always subsonic. If the flow is subsonic then the Mach number is ____.

a)

greater than unity

b)

less than unity

c)

near unity

d)

unity

137.

Which of the following parameters determine the friction factor of turbulent flow in a rough pipe?

a)

Froude number and relative roughness

b)

Froude number and Mach number

c)

Reynolds number and relative roughness

d)

Mach number and relative roughness

138.

Which of the following devices used to measure the discharge of outflow from a vessel?

a)

pitot tube

b)

pump head

c)

orifice

d)

obstruction meter

139.

Weir refers to an opening _____.

a)

having closed perimeter and of regular form through which water flows

b)

having prolonged sides with length of 2 to 3 diameters of opening in thick wall

c)

having partially full flow

d)

in hydraulic structure with regulation provision

140.

A converging – diverging nozzle is the standard equipment in _____.

a)

subsonic aircraft

b)

hypersonic aircraft

c)

supersonic aircraft

d)

trisonic aircraft

141.

When a falling object reaches a speed at which the drag force equals its weight, it has achieved _____.

a)

Mach one

b)

a laminar boundary layer

c)

a turbulent boundary layer

d)

terminal velocity

142.

The following are examples of indirect (secondary) measurements to measure flow rates using obstruction meters except _____.

a)

variable area meters

b)

volume tanks

c)

venture meters

d)

flow nozzles

143.

The following are examples of indirect (secondary) measurements to measure flow rates using obstruction meters except:

a)

pitot static meters

b)

static pressure probes

c)

weight and mass scales

d)

direction - sensing probes

144.

The combination of enthalpy and kinetic energy of fluid is termed as _____.

a)

latent enthalpy

b)

throttling enthalpy

c)

heat enthalpy

d)

stagnation enthalpy

145.

The matching of scale model and full - scale results for a fluid dynamic phenomena with a free surface requires equality of _____.

a)

Reynolds number

b)

Froude number

c)

Weber number

d)

Cauchy number

146.

The matching of scale model and full - scale results for a fluid dynamic phenomena involving compressible fluids requires equality of _____.

a)

Reynolds number

b)

Cauchy number

c)

Froude number

d)

Mach number

147.

The matching of scale model and full - scale prototype results for a fluid dynamic phenomena involving surface tension requires equality of _____.

a)

Reynolds number

b)

Froude number

c)

Weber number

d)

Cauchy number

148.

The matching of scale model and full - scale prototype results for a fluid dynamic phenomena involving a fully submerged body requires equality of _____.

a)

Reynolds number

b)

Froude number

c)

Weber number

d)

Mach number

149.

The magnitude of the drag coefficient of a sphere in water is dependent upon all of the following except _____.

a)

fluid density

b)

fluid velocity

c)

units of measure (SI or English Engineering System)

d)

drag force

150.

The known fact that there is no resistance to bodies moving through an ideal (non - viscous) fluids.

a)

Reynold's analogy

b)

D'Alembert's paradox

c)

Newton's second law

d)

the second law of thermodynamics

151.

The following are all examples of indirect (secondary) miscellaneous methods to measure flow except _____.

a)

turbine and propeller meters

b)

magnetic flow meters

c)

positive displacement meters

d)

hot - wire anemometers

152.

One could expect the possibility of Reynolds number similarity in all of the following cases except _____.

a)

Pumps

b)

Turbines

c)

fans

d)

weirs

153.

One could expect the possibility of Froude number similarity in all of the following cases except _____.

a)

surface ships

b)

surface wave motion

c)

flow over weirs

d)

closed - pipe turbulent pipe flow

154.

One could expect the possibility of Froude number similarity in all of the following cases except _____.

a)

motion of a fluid jet

b)

surge and flood waves

c)

flow over spillways

d)

subsonic airfoils

155.

In the absence of any heat and work interactions and any changes in potential energy, the stagnation enthalpy of a fluid remains constant during _____.

a)

unsteady flow

b)

turbulent flow

c)

steady flow

d)

variable flow

156.

Flows through multi - loop systems may be computed by _____.

a)

any closed - form solution of simultaneous equations

b)

the Hardy - Cross method

c)

trial and error

d)

all of these

157.

One could expect the possibility of Froude number similarity in all of the following cases except _____.

a)

surface ships

b)

surface wave motion

c)

flow over weirs

d)

closed - pipe turbulent pipe flow

158.

One could expect the possibility of Froude number similarity in all of the following cases except _____.

a)

motion of a fluid jet

b)

flow over spillways

c)

surge and flood waves

d)

subsonic airfoils

159.

A decrease in stagnation pressure will decrease the mass flux through the ______.

a)

diverging nozzle

b)

converging nozzle

c)

converging - diverging nozzle

d)

none of these

160.

The increase in velocity past the throat is due to the rapid decrease in the ______.

a)

fluid density

b)

fluid temperature

c)

fluid specific volume

d)

fluid pressure

161.

The mass per unit volume of any substance.

a)

Density

b)

Specific weight

c)

Specific volume

d)

Specific gravity

162.

The force of gravity on unit volume is ______.

a)

Density

b)

specific weight

c)

specific volume

d)

specific gravity

163.

The reciprocal of density is ______.

a)

specific volume

b)

specific gravity

c)

specific weight

d)

specific heat

164.

What is the highest pressure under which distinguishable liquid and vapor phases can exist in equilibrium?

a)

Maximum pressure

b)

Critical pressure

c)

Atmosphere

d)

Peak pressure

165.

A substance that exists, or is regarded as existing, as a continuum characterized by a low resistance to flow and the tendency to assume the shape of its container.

a)

Fluid

b)

Molecule

c)

Atom

d)

Vapor