4791 + Mcqs in Mechanical Engineering Page 73 McqOptions

3601.	The product of mass and accelaration of flowing liquid is called
A.	inertia force
B.	viscous force
C.	gravity force
D.	pressure force
Answer» B. viscous force

Discussion

3602.	The dynamic viscosity of the liquid __________ with rise in temperature.
A.	remain unaffected
B.	increases
C.	decreases
Answer» D.

Discussion

3603.	When the Mach number is between __________ the flow is called super-sonic flow.
A.	1 and 2.5
B.	2.5 and 4
C.	4 and 6
D.	1 and 6
Answer» E.

Discussion

3604.	When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.
A.	sum
B.	difference
C.	arithmatic mean
D.	geometric mean
Answer» C. arithmatic mean

Discussion

3605.	The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and = Density of the fluid)
A.	<span class="root"><i>K</i>. </span>
B.	<span class="root"><i>K</i>/ </span>
C.	<span class="root"> /<i>K</i></span>
D.	<i>K</i>
E.	.
Answer» C. <span class="root"> /<i>K</i></span>

Discussion

3606.	Barometer is used to measure
A.	velocity of liquid
B.	atmospheric pressure
C.	pressure in pipes and channels
D.	difference of pressure between two points in a pipe
Answer» C. pressure in pipes and channels

Discussion

3607.	The hydraulic gradient line is always parallel to the centre line of the pipe.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

3608.	A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3609.	The vacuum pressure can be measured with the help of a piezometer tube.
A.	True
B.	False
Answer» C.

Discussion

3610.	When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure
A.	varies as the square of the radial distance
B.	increases linearly as its radial distance
C.	increases as the square of the radial distance
D.	decreases as the square of the radial distance
Answer» B. increases linearly as its radial distance

Discussion

3611.	The specific weight of compressible fluids does not remain constant.
A.	True
B.	False
Answer» B. False

Discussion

3612.	The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
A.	surface tension
B.	compressibility
C.	capillarity
D.	viscosity
Answer» E.

Discussion

3613.	In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere.
A.	True
B.	False
Answer» B. False

Discussion

3614.	In a sharp-crested weir, the thickness of the weir is kept less than half of the height of water above the crest of the weir.
A.	True
B.	False
Answer» B. False

Discussion

3615.	The pressure of air __________ with the increase of height from the surface of the earth.
A.	does not change
B.	decreases
C.	increases
Answer» C. increases

Discussion

3616.	The sheet of water flowing over a notch or a weir is known as
A.	sill or crest
B.	nappe or vein
C.	orifice
D.	none of these
Answer» C. orifice

Discussion

3617.	A flow in which the quantity of liquid flowing per second is not constant, is called
A.	streamline flow
B.	turbulent flow
C.	steady flow
D.	unsteady flow
Answer» E.

Discussion

3618.	A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
A.	0.46
B.	0.64
C.	0.78
D.	0.87
Answer» C. 0.78

Discussion

3619.	According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/167-214-1.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/167-214-2.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/167-214-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/167-214-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/167-214-2.png">

Discussion

3620.	A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
A.	The pressure on the wall at the liquid level is minimum.
B.	The pressure on the bottom of the wall is maximum.
C.	The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
D.	The pressure on the bottom of the wall is zero.
Answer» D. The pressure on the bottom of the wall is zero.

Discussion

3621.	Water is a __________ fluid.
A.	real
B.	ideal
C.	newtonian
D.	non-newtonian
Answer» D. non-newtonian

Discussion

3622.	A point, in a compressible flow where the velocity of fluid is zero, is called
A.	critical point
B.	vena contracta
C.	stagnation point
D.	none of these
Answer» D. none of these

Discussion

3623.	According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3624.	If the value of coefficient of discharge increases, the discharge through the orifice decreases.
A.	True
B.	False
Answer» C.

Discussion

3625.	The property of a liquid which controls its rate of flow is called viscosity.
A.	True
B.	False
Answer» B. False

Discussion

3626.	The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
A.	0.0116 stoke
B.	0.116 stoke
C.	0.0611 stoke
D.	0.611 stoke
Answer» B. 0.116 stoke

Discussion

3627.	The factional resistance of a pipe varies approximately with __________ of the liquid.
A.	pressure
B.	velocity
C.	square of velocity
D.	cube of velocity
Answer» D. cube of velocity

Discussion

3628.	When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3629.	A flow is called hyper-sonic, if the Mach number is
A.	less than unity
B.	unity
C.	between 1 and 6
D.	none of these
Answer» E.

Discussion

3630.	The absolute pressure is equal to
A.	gauge pressure + atmospheric pressure
B.	gauge pressure - atmospheric pressure
C.	atmospheric pressure - gauge pressure
D.	gauge pressure - vacuum pressure
Answer» B. gauge pressure - atmospheric pressure

Discussion

3631.	The liquid used in manometers should have
A.	low density
B.	high density
C.	low surface tension
D.	high surface tension
Answer» E.

Discussion

3632.	When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called
A.	gauge pressure
B.	absolute pressure
C.	positive gauge pressure
D.	vacuum pressure
Answer» D. vacuum pressure

Discussion

3633.	The hammer blow in pipes occurs when
A.	there is excessive leakage in the pipe
B.	the pipe bursts under high pressure of fluid
C.	the flow of fluid through the pipe is suddenly brought to rest by closing of the valve
D.	the flow of fluid through the pipe is gradually brought to rest by closing of the valve
Answer» D. the flow of fluid through the pipe is gradually brought to rest by closing of the valve

Discussion

3634.	When a body is placed over a liquid, it will sink down if
A.	gravitational force is equal to the upthrust of the liquid
B.	gravitational force is less than the upthrust of the liquid
C.	gravitational force is more than the upthrust of the liquid
D.	none of the above
Answer» D. none of the above

Discussion

3635.	When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis rad/s, then depth of parabola which the liquid assumes is
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/175-298-2.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/175-298-1.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/175-298-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/175-298-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/175-298-3.png">

Discussion

3636.	The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3637.	The viscosity of a liquid __________ its rate of flow through a hole in a vessel.
A.	effects
B.	does not effect
Answer» B. does not effect

Discussion

3638.	The Cippoletti weir is a __________ weir.
A.	rectangular
B.	triangular
C.	trapezoidal
D.	circular
Answer» D. circular

Discussion

3639.	When a body is placed over a liquid, it will float if
A.	gravitational force is equal to the upthrust of the liquid
B.	gravitational force is less than the upthrust of the liquid
C.	gravitational force is more than the upthrust of the liquid
D.	none of the above
Answer» B. gravitational force is less than the upthrust of the liquid

Discussion

3640.	A flow through an expanding tube at increasing rate is called unsteady non-uniform flow.
A.	Yes
B.	No
Answer» B. No

Discussion

3641.	Water is __________ liquid.
A.	a compressible
B.	an incompressible
Answer» C.

Discussion

3642.	An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.
A.	less than twice
B.	more than twice
C.	less than three times
D.	more than three times
Answer» D. more than three times

Discussion

3643.	The volume of a fluid __________ as the pressure increases.
A.	remains same
B.	decreases
C.	increases
Answer» C. increases

Discussion

3644.	The pressure of the liquid flowing through the divergent portion of a venturimeter
A.	remains constant
B.	increases
C.	decreases
D.	depends upon mass of liquid
Answer» D. depends upon mass of liquid

Discussion

3645.	The dedendum circle diameter is equal to (where = Pressure angle)
A.	pitch circle dia. x cos
B.	addendum circle dia. x cos
C.	clearance circle dia. x cos
D.	pitch circle dia. x sin
Answer» B. addendum circle dia. x cos

Discussion

3646.	A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the centre of the circle.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3647.	The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as
A.	path line
B.	stream line
C.	steak line
D.	potential line
Answer» C. steak line

Discussion

3648.	A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-167-1.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-167-2.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-167-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-167-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-167-4.png">

Discussion

3649.	Stoke is the unit of
A.	kinematic viscosity in C. G. S. units
B.	kinematic viscosity in M. K. S. units
C.	dynamic viscosity in M. K. S. units
D.	dynamic viscosity in S. I. units
Answer» B. kinematic viscosity in M. K. S. units

Discussion

3650.	In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
A.	equal to
B.	one-fourth
C.	one-third
D.	one-half
Answer» C. one-third

Discussion

Explore topic-wise MCQs in Engineering.

The product of mass and accelaration of flowing liquid is called

The dynamic viscosity of the liquid __________ with rise in temperature.

When the Mach number is between __________ the flow is called super-sonic flow.

When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.

The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and = Density of the fluid)

Barometer is used to measure

The hydraulic gradient line is always parallel to the centre line of the pipe.

A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.

The vacuum pressure can be measured with the help of a piezometer tube.

When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure

The specific weight of compressible fluids does not remain constant.

The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere.

In a sharp-crested weir, the thickness of the weir is kept less than half of the height of water above the crest of the weir.

The pressure of air __________ with the increase of height from the surface of the earth.

The sheet of water flowing over a notch or a weir is known as

A flow in which the quantity of liquid flowing per second is not constant, is called

A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?

Water is a __________ fluid.

A point, in a compressible flow where the velocity of fluid is zero, is called

According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir.

If the value of coefficient of discharge increases, the discharge through the orifice decreases.

The property of a liquid which controls its rate of flow is called viscosity.

The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is

The factional resistance of a pipe varies approximately with __________ of the liquid.

When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero

A flow is called hyper-sonic, if the Mach number is

The absolute pressure is equal to

The liquid used in manometers should have

When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called

The hammer blow in pipes occurs when

When a body is placed over a liquid, it will sink down if

When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis rad/s, then depth of parabola which the liquid assumes is

The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir

The viscosity of a liquid __________ its rate of flow through a hole in a vessel.

The Cippoletti weir is a __________ weir.

When a body is placed over a liquid, it will float if

A flow through an expanding tube at increasing rate is called unsteady non-uniform flow.

Water is __________ liquid.

An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

The volume of a fluid __________ as the pressure increases.

The pressure of the liquid flowing through the divergent portion of a venturimeter

The dedendum circle diameter is equal to (where = Pressure angle)

A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the centre of the circle.

The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

Stoke is the unit of

In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.