4791 + Mcqs in Mechanical Engineering Page 75 McqOptions

3701.	When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of
A.	a triangle
B.	a paraboloid
C.	an ellipse
D.	none of these
Answer» C. an ellipse

Discussion

3702.	The velocity corresponding to Reynold number of 2000 is called
A.	sub-sonic velocity
B.	super-sonic velocity
C.	lower critical velocity
D.	higher critical velocity
Answer» D. higher critical velocity

Discussion

3703.	The difference between the notch and weir is that the notch is of bigger size and the weir is of a smaller size.
A.	Agree
B.	Disagree
Answer» C.

Discussion

3704.	Euler's number is the ratio of __________ force to pressure force.
A.	inertia
B.	gravity
C.	viscous
Answer» B. gravity

Discussion

3705.	A piezometer tube is used only for measuring
A.	low pressure
B.	high pressure
C.	moderate pressure
D.	vacuum pressure
Answer» D. vacuum pressure

Discussion

3706.	The flow in a pipe is turbulent when Reynold number is
A.	less than 2000
B.	between 2000 and 2800
C.	more than 2800
D.	none of these
Answer» D. none of these

Discussion

3707.	An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
A.	equal to
B.	directly proportional
C.	inversely proportional
Answer» C. inversely proportional

Discussion

3708.	When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
A.	remains horizontal
B.	becomes curved
C.	falls on the front end
D.	falls on the back end
Answer» D. falls on the back end

Discussion

3709.	The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
A.	1/2 depth
B.	1/2 breadth
C.	1/2 sloping side
D.	1/4 (depth + breadth)
Answer» B. 1/2 breadth

Discussion

3710.	The intensity of pressure on an immersed surface __________ with the increase in depth.
A.	does not change
B.	increases
C.	decreases
Answer» C. decreases

Discussion

3711.	In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
A.	less than
B.	more than
Answer» B. more than

Discussion

3712.	The flow in a pipe is laminar, when Reynold number is less than 2000.
A.	True
B.	False
Answer» B. False

Discussion

3713.	The power transmitted through the pipe is maximum when the head lost due to friction is equal to
A.	one-fourth of the total supply head
B.	one-third of the total supply head
C.	one-half of the total supply head
D.	two-third of the total supply head
Answer» C. one-half of the total supply head

Discussion

3714.	The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3715.	A venturiflume is a flumed structure constructed across a channel by restricting its width.
A.	True
B.	False
Answer» B. False

Discussion

3716.	The loss of head at exit of a pipe is
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-1.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-2.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-172-2.png">

Discussion

3717.	The rise, in water level, which occurs during the transformation of the unstable shooting flow to the stable streaming flow is called hydraulic jump.
A.	Yes
B.	No
Answer» B. No

Discussion

3718.	The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
A.	half the depth
B.	half the breadth
C.	twice the depth
D.	twice the breadth
Answer» B. half the breadth

Discussion

3719.	The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.
A.	Yes
B.	No
Answer» B. No

Discussion

3720.	The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-171-1.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-171-2.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-171-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-171-4.png">
Answer» E.

Discussion

3721.	The flow of water through the hole in the bottom of a wash basin is an example of
A.	steady flow
B.	uniform flow
C.	free vortex
D.	forced vortex
Answer» D. forced vortex

Discussion

3722.	Laminar flow __________ place at very low velocities.
A.	takes
B.	does not take
Answer» B. does not take

Discussion

3723.	A manometer can be used to measure vacuum pressures.
A.	Agree
B.	disagree
Answer» B. disagree

Discussion

3724.	The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-201-1.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-201-2.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-201-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-201-4.png">
Answer» E.

Discussion

3725.	The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3726.	A governor is said to be isochronous when range of speed is zero for all radii of rotation of the balls within the working range, neglecting friction.
A.	Yes
B.	No
Answer» B. No

Discussion

3727.	An overdamped system, when disturbed from the equilibrium position, will not cross the equilibrium position.
A.	Right
B.	Wrong
Answer» B. Wrong

Discussion

3728.	The efficiency of a screw jack is dependent upon the load raised or lowered.
A.	True
B.	False
Answer» C.

Discussion

3729.	The frequency of oscillation of a torsional pendulum is
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-94-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-94-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-94-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-94-4.png">
Answer» E.

Discussion

3730.	The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
A.	0
B.	1
C.	2
D.	-1
Answer» B. 1

Discussion

3731.	The sense of coriolis component 2 v is same as that of the relative velocity vector v rotated at
A.	45 in the direction of rotation of the link containing the path
B.	45 in the direction opposite to the rotation of the link containing the path
C.	90 in the direction of rotation of the link containing the path
D.	180 in the direction opposite to the rotation of the link containing the path
Answer» D. 180 in the direction opposite to the rotation of the link containing the path

Discussion

3732.	The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because
A.	whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
B.	the Ackerman steering gear consists of turning pairs
C.	the Ackerman steering gear is most economical
D.	both (a) and (b)
Answer» E.

Discussion

3733.	A mechanism is an assemblage of
A.	two links
B.	three links
C.	four or more than four links
D.	all of these
Answer» D. all of these

Discussion

3734.	The two links are said to have a pure rolling contact, when their instantaneous centre __________ on their point of contact.
A.	lies
B.	does not lie
Answer» B. does not lie

Discussion

3735.	One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where = Deflection of the spring)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-86-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-86-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-86-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-86-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/477-86-3.png">

Discussion

3736.	The brake commonly used in motor cars is internal expanding brake.
A.	True
B.	False
Answer» B. False

Discussion

3737.	The velocity corresponding to Reynold number of 2800, is called
A.	sub-sonic velocity
B.	super-sonic velocity
C.	lower critical velocity
D.	higher critical velocity
Answer» E.

Discussion

3738.	When the pipes are in series, the total head loss is equal to the sum of the head loss in each pipe.
A.	Yes
B.	No
Answer» B. No

Discussion

3739.	Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.
A.	True
B.	False
Answer» B. False

Discussion

3740.	The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-1.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-2.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-3.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/169-240-2.png">

Discussion

3741.	The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.
A.	vertically and parallel
B.	vertically and perpendicular
C.	horizontally and parallel
D.	horizontally and perpendicular
Answer» E.

Discussion

3742.	At the node, the shaft remains unaffected by the vibration.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3743.	The contact ratio is given by
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/492-244-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/492-244-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/492-244-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/492-244-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/492-244-4.png">

Discussion

3744.	When the two elements of a pair have __________ when in motion, it is said to a lower pair.
A.	line or point contact
B.	surface contact
Answer» C.

Discussion

3745.	The brake commonly used in railway trains is
A.	shoe brake
B.	band brake
C.	band and block brake
D.	internal expanding brake
Answer» B. band brake

Discussion

3746.	The acceleration of the particle moving with simple harmonic motion is __________ at the mean position.
A.	zero
B.	minimum
C.	maximum
Answer» B. minimum

Discussion

3747.	In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.
A.	Yes
B.	No
Answer» C.

Discussion

3748.	The distance moved by the valve from one end to the other end is called valve travel.
A.	True
B.	False
Answer» B. False

Discussion

3749.	The Klein's method of construction for reciprocating engine mechanism
A.	is a simplified version of instantaneous centre method
B.	utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine
C.	enables determination of coriolis component
D.	is based on the acceleration diagram
Answer» C. enables determination of coriolis component

Discussion

3750.	A Watt's governor is a spring loaded governor.
A.	Yes
B.	No
Answer» C.

Discussion

Explore topic-wise MCQs in Engineering.

When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of

The velocity corresponding to Reynold number of 2000 is called

The difference between the notch and weir is that the notch is of bigger size and the weir is of a smaller size.

Euler's number is the ratio of __________ force to pressure force.

A piezometer tube is used only for measuring

The flow in a pipe is turbulent when Reynold number is

An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

The intensity of pressure on an immersed surface __________ with the increase in depth.

In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

The flow in a pipe is laminar, when Reynold number is less than 2000.

The power transmitted through the pipe is maximum when the head lost due to friction is equal to

The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid

A venturiflume is a flumed structure constructed across a channel by restricting its width.

The loss of head at exit of a pipe is

The rise, in water level, which occurs during the transformation of the unstable shooting flow to the stable streaming flow is called hydraulic jump.

The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.

The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

The flow of water through the hole in the bottom of a wash basin is an example of

Laminar flow __________ place at very low velocities.

A manometer can be used to measure vacuum pressures.

The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy.

A governor is said to be isochronous when range of speed is zero for all radii of rotation of the balls within the working range, neglecting friction.

An overdamped system, when disturbed from the equilibrium position, will not cross the equilibrium position.

The efficiency of a screw jack is dependent upon the load raised or lowered.

The frequency of oscillation of a torsional pendulum is

The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

The sense of coriolis component 2 v is same as that of the relative velocity vector v rotated at

The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

A mechanism is an assemblage of

The two links are said to have a pure rolling contact, when their instantaneous centre __________ on their point of contact.

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where = Deflection of the spring)

The brake commonly used in motor cars is internal expanding brake.

The velocity corresponding to Reynold number of 2800, is called

When the pipes are in series, the total head loss is equal to the sum of the head loss in each pipe.

Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.

The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)

The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

At the node, the shaft remains unaffected by the vibration.

The contact ratio is given by

When the two elements of a pair have __________ when in motion, it is said to a lower pair.

The brake commonly used in railway trains is

The acceleration of the particle moving with simple harmonic motion is __________ at the mean position.

In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.

The distance moved by the valve from one end to the other end is called valve travel.

The Klein's method of construction for reciprocating engine mechanism

A Watt's governor is a spring loaded governor.