4791 + Mcqs in Mechanical Engineering Page 74 McqOptions

3651.	Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.
A.	sum
B.	different
C.	product
D.	ratio
Answer» D. ratio

Discussion

3652.	The density of air is same at different heights.
A.	Correct.
B.	Incorrect
Answer» C.

Discussion

3653.	A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.
A.	True
B.	False
Answer» C.

Discussion

3654.	The load cup of a screw jack is made separate from the head of the spindle to
A.	enhance the load carrying capacity of the jack
B.	reduce the effort needed for lifting the working load
C.	reduce the value of frictional torque required to be countered for lifting the load
D.	prevent the rotation of load being lifted
Answer» E.

Discussion

3655.	In an open pair, the two elements of a pair
A.	have a surface contact when in motion
B.	have a line or point contact when in motion
C.	are kept in contact by the action of external forces, when in motion
D.	are not held together mechanically
Answer» E.

Discussion

3656.	In order to give a complete secondary balance of a multi-cylinder in-line engine,
A.	the algebraic sum of the secondary forces must be equal to zero
B.	the algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
C.	both (a) and (b)
D.	none of these
Answer» D. none of these

Discussion

3657.	The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
A.	to dip the nose and tail
B.	to raise the nose and tail
C.	to raise the nose and dip the tail
D.	to dip the nose and raise the tail
Answer» D. to dip the nose and raise the tail

Discussion

3658.	Efficiency of a screw jack is given by
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/485-170-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/485-170-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/485-170-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/485-170-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/485-170-3.png">

Discussion

3659.	The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where = Semi-angle of the groove)
A.	sin
B.	cos
C.	cosec
D.	sec
Answer» D. sec

Discussion

3660.	A point B on a rigid link AB moves with respect to A with angular velocity rad/s. The total acceleration of B with respect to A will be equal to
A.	vector sum of radial component and coriolis component
B.	vector sum of tangential component and coriolis component
C.	vector sum of radial component and tangential component
D.	vector difference of radial component and tangential component
Answer» D. vector difference of radial component and tangential component

Discussion

3661.	A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis
A.	at the origin
B.	below the origin
C.	above the origin
D.	any one of these
Answer» C. above the origin

Discussion

3662.	When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.
A.	remains constant
B.	decreases
C.	increases
Answer» C. increases

Discussion

3663.	In a simple harmonic motion, the velocity vector with respect to displacement vector
A.	is in phase
B.	leads by 90
C.	leads by 180
D.	lags by 90
Answer» E.

Discussion

3664.	The primary unbalanced force of reciprocating masses is inversely proportional to the crank radius.
A.	Yes
B.	No
Answer» C.

Discussion

3665.	The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.
A.	Yes
B.	No
Answer» B. No

Discussion

3666.	The pitching of a ship is assumed to take place with simple harmonic motion.
A.	Yes
B.	No
Answer» B. No

Discussion

3667.	Two pulleys of radii r1 and r2 and at distance x apart are connected by means of an open belt drive. The length of the belt is
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-3.png">

Discussion

3668.	The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where S = Static deflection of simply supported shaft due to uniformly distributed load)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-468-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-468-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-468-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-468-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/514-468-3.png">

Discussion

3669.	A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force
A.	the reaction on me inner wheels increases and on the outer wheels decreases
B.	the reaction on the outer wheels increases and on the inner wheels decreases
C.	the reaction on the front wheels increases and on the rear wheels decreases
D.	the reaction on the rear wheels increases and on the front wheels decreases
Answer» C. the reaction on the front wheels increases and on the rear wheels decreases

Discussion

3670.	The sensitiveness of a governor depends upon the lift of the sleeve.
A.	Right
B.	Wrong
Answer» B. Wrong

Discussion

3671.	The ratio of maximum fluctuation of energy to the workdone per cycle is called
A.	fluctuation of energy
B.	maximum fluctuation of energy
C.	coefficient of fluctuation of energy
D.	none of these
Answer» D. none of these

Discussion

3672.	In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, This method will
A.	cause withdrawing or throttling of steam
B.	reduce length of effective stroke of piston
C.	reduce maximum opening of port to steam
D.	all of these
Answer» D. all of these

Discussion

3673.	The centre of suspension and centre of percussion are not interchangeable.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

3674.	The size of cam depends upon
A.	base circle
B.	pitch circle
C.	prime circle
D.	pitch curve
Answer» B. pitch circle

Discussion

3675.	Reynold's number is the ratio of inertia force to
A.	pressure force
B.	elastic force
C.	gravity force
D.	viscous force
Answer» E.

Discussion

3676.	A flow in which __________ force is dominating over the viscosity is called turbulent flow.
A.	elastic
B.	surface tension
C.	viscous
D.	inertia
Answer» E.

Discussion

3677.	If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.
A.	True
B.	False
Answer» C.

Discussion

3678.	The ratio of the inertia force to the gravity force is called Froude number.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3679.	The specific gravity has no units.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3680.	The depth of water in a channel corresponding to the minimum specific energy is known as critical depth.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3681.	Bulk modulus of a fluid __________ as the pressure increases.
A.	remains same
B.	decreases
C.	increases
Answer» D.

Discussion

3682.	A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is
A.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/152-64-2.png">
B.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/152-64-3.png">
C.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/152-64-4.png">
D.	<img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/152-64-5.png">
Answer» C. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/152-64-4.png">

Discussion

3683.	The atmospheric pressure at sea level is
A.	103 kN/m
B.	<sup>2</sup>
C.	10.3 m of water
D.	760 mm of mercury
E.	all of these
Answer» E. all of these

Discussion

3684.	The hydraulic gradient line may be above or below the centre line of the pipe.
A.	True
B.	False
Answer» C.

Discussion

3685.	A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
A.	2.89 kN
B.	8.29 kN
C.	9.28 kN
D.	28.9 kN
Answer» C. 9.28 kN

Discussion

3686.	When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3687.	The specific weight of sea water is __________ that of pure water.
A.	same as
B.	less than
C.	more than
Answer» D.

Discussion

3688.	The buoyancy depends upon the
A.	weight of the liquid displaced
B.	pressure with which the liquid is displaced
C.	viscosity of the liquid
D.	compressibility of the liquid
Answer» B. pressure with which the liquid is displaced

Discussion

3689.	The total energy line lies over the centre line of the pipe by an amount equal to
A.	pressure head
B.	velocity head
C.	pressure head + velocity head
D.	pressure head - velocity head
Answer» D. pressure head - velocity head

Discussion

3690.	The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.
A.	equal to
B.	less than
C.	more than
Answer» D.

Discussion

3691.	According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3692.	The ratio of the inertia force to the surface tension force is called Weber's number.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3693.	For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called
A.	continuity equation
B.	Bernoulli's equation
C.	Pascal's law
D.	Archimede's principle
Answer» C. Pascal's law

Discussion

3694.	If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.
A.	neutral
B.	stable
C.	unstable
Answer» B. stable

Discussion

3695.	A flow is called sub-sonic, if the Mach number is
A.	less than unity
B.	unity
C.	between 1 and 6
D.	more than 6
Answer» B. unity

Discussion

3696.	The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
A.	less than
B.	more than
Answer» C.

Discussion

3697.	Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
A.	internal
B.	external
Answer» B. external

Discussion

3698.	The flow in a pipe is neither laminar nor turbulent when Reynold number is
A.	less than 2000
B.	between 2000 and 2800
C.	more than 2800
D.	none of these
Answer» C. more than 2800

Discussion

3699.	The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
A.	Newton's law of motion
B.	Newton's law of cooling
C.	Newton's law of viscosity
D.	Newton's law of resistance
Answer» E.

Discussion

3700.	All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

Explore topic-wise MCQs in Engineering.

Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.

The density of air is same at different heights.

A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.

The load cup of a screw jack is made separate from the head of the spindle to

In an open pair, the two elements of a pair

In order to give a complete secondary balance of a multi-cylinder in-line engine,

The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

Efficiency of a screw jack is given by

The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where = Semi-angle of the groove)

A point B on a rigid link AB moves with respect to A with angular velocity rad/s. The total acceleration of B with respect to A will be equal to

A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis

When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

In a simple harmonic motion, the velocity vector with respect to displacement vector

The primary unbalanced force of reciprocating masses is inversely proportional to the crank radius.

The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.

The pitching of a ship is assumed to take place with simple harmonic motion.

Two pulleys of radii r1 and r2 and at distance x apart are connected by means of an open belt drive. The length of the belt is

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where S = Static deflection of simply supported shaft due to uniformly distributed load)

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force

The sensitiveness of a governor depends upon the lift of the sleeve.

The ratio of maximum fluctuation of energy to the workdone per cycle is called

In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, This method will

The centre of suspension and centre of percussion are not interchangeable.

The size of cam depends upon

Reynold's number is the ratio of inertia force to

A flow in which __________ force is dominating over the viscosity is called turbulent flow.

If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.

The ratio of the inertia force to the gravity force is called Froude number.

The specific gravity has no units.

The depth of water in a channel corresponding to the minimum specific energy is known as critical depth.

Bulk modulus of a fluid __________ as the pressure increases.

A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

The atmospheric pressure at sea level is

The hydraulic gradient line may be above or below the centre line of the pipe.

A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

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

The specific weight of sea water is __________ that of pure water.

The buoyancy depends upon the

The total energy line lies over the centre line of the pipe by an amount equal to

The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.

The ratio of the inertia force to the surface tension force is called Weber's number.

For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.

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

The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.

Re-entrant or Borda's mouthpiece is an __________ mouthpiece.

The flow in a pipe is neither laminar nor turbulent when Reynold number is

The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow.