4791 + Mcqs in Mechanical Engineering Page 76 McqOptions

3751.	The velocity of the rubbing surface __________ with the distance from the axis of the bearing.
A.	increases
B.	decreases
Answer» B. decreases

Discussion

3752.	The partial balancing means
A.	balancing partially revolving masses
B.	balancing partially reciprocating masses
C.	best balancing of engines
D.	all of these
Answer» C. best balancing of engines

Discussion

3753.	Which of the following statement is correct as regard to the difference between a machine and a structure?
A.	The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
B.	The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
C.	A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
D.	all of the above
Answer» E.

Discussion

3754.	The coriolis component of acceleration depends upon
A.	velocity of slider
B.	angular velocity of the link
C.	both (a) and (b)
D.	none of these
Answer» D. none of these

Discussion

3755.	Effort of a governor is the
A.	mean force exerted at the sleeve for a given percentage change of speed
B.	workdone at the sleeve for maximum equilibrium speed
C.	mean force exerted at the sleeve for maximum equilibrium speed
D.	none of the above
Answer» B. workdone at the sleeve for maximum equilibrium speed

Discussion

3756.	The pressure angle for involute gears depends upon the size of teeth.
A.	Right
B.	Wrong
Answer» C.

Discussion

3757.	The maximum displacement of a body, from its mean position is called amplitude.
A.	True
B.	False
Answer» B. False

Discussion

3758.	In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle , the angular velocity of the connecting rod is given by
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-287-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-287-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-287-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-287-4.png">
Answer» E.

Discussion

3759.	The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
A.	parallel
B.	perpendicular
Answer» C.

Discussion

3760.	The stress induced in a body will be shear stress, when it is subjected to
A.	longitudinal vibrations
B.	transverse vibrations
C.	torsional vibrations
D.	none of these
Answer» D. none of these

Discussion

3761.	When a body is subjected to longitudinal vibrations, the stress induced in a body will be tensile or compressive stress.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3762.	In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead.
A.	Agree
B.	Disagree
Answer» C.

Discussion

3763.	A spring controlled governor is said to be unstable when the controlling force
A.	increases as the radius of rotation decreases
B.	increases as the radius of rotation increases
C.	decreases as the radius of rotation increases
D.	remains constant for all radii of rotation
Answer» D. remains constant for all radii of rotation

Discussion

3764.	A system of masses rotating in different parallel planes is in dynamic balance if the
A.	resultance force is equal to zero
B.	resultant couple is equal to zero
C.	resultant force and resultant couple are both equal to zero
D.	resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Answer» D. resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

Discussion

3765.	The velocity of sliding __________ the distance of the point of contact from the pitch point.
A.	is directly proportional to
B.	is inversely proportional to
C.	is equal to cos multiplied by
D.	does not depend upon
Answer» B. is inversely proportional to

Discussion

3766.	The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
A.	dedendum
B.	addendum
C.	clearance
D.	working depth
Answer» D. working depth

Discussion

3767.	The critical speed of a shaft depends upon its
A.	mass
B.	stiffness
C.	mass and stiffness
D.	stiffness and eccentricity
Answer» D. stiffness and eccentricity

Discussion

3768.	Which of the following mechanism is an approximate straight line motion mechanism?
A.	Watt's mechanism
B.	Grasshopper mechanism
C.	Robert's mechanism
D.	all of these
Answer» E.

Discussion

3769.	Pitch point of a cam is
A.	a point on the pitch curve having minimum pressure angle
B.	a point on the pitch curve having maximum pressure angle
C.	any point on the pitch curve
D.	any point on the pitch circle
Answer» C. any point on the pitch curve

Discussion

3770.	The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-92-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-92-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-92-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/478-92-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/478-92-3.png">

Discussion

3771.	The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called
A.	radial component
B.	tangential component
C.	coriolis component
D.	none of these
Answer» B. tangential component

Discussion

3772.	When the particles of a body moves perpendicular to its axis, then the body is said to have
A.	longitudinal vibration
B.	transverse vibration
C.	torsional vibration
D.	none of these
Answer» C. torsional vibration

Discussion

3773.	In gears, interference takes place when
A.	the tip of a tooth of a mating gear digs into the portion between base and root circles
B.	gears do not move smoothly in the absence of lubrication
C.	pitch of the gears is not same
D.	gear teeth are undercut
Answer» B. gears do not move smoothly in the absence of lubrication

Discussion

3774.	The ratio of maximum fluctuation of speed to the mean speed is called
A.	fluctuation of speed
B.	maximum fluctuation of speed
C.	coefficient of fluctuation of speed
D.	none of these
Answer» D. none of these

Discussion

3775.	Which of the following statement is correct for involute gears?
A.	The interference is inherently absent.
B.	The variation in centre distance of shafts increases radial force.
C.	A convex flank is always in contact with concave flank.
D.	The pressure angle is constant throughout the teeth engagement.
Answer» E.

Discussion

3776.	Under logarithmic decrement, the amplitude of successive vibrations are
A.	constant
B.	in arithmetic progression
C.	in geometric progression
D.	in logarithmic progression
Answer» D. in logarithmic progression

Discussion

3777.	A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
A.	2
B.	3
C.	4
D.	5
Answer» E.

Discussion

3778.	In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then
A.	open belt drive is recommended
B.	crossed belt drive is recommended
C.	both open belt drive and crossed belt drive is recommended
D.	the drive is recommended depending upon the torque transmitted
Answer» C. both open belt drive and crossed belt drive is recommended

Discussion

3779.	A shaft carrying two rotors at its ends will have
A.	no node
B.	one node
C.	two nodes
D.	three nodes
Answer» C. two nodes

Discussion

3780.	When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
A.	return to equilibriumposition without oscillation
B.	oscillate with increasing time period
C.	oscillate with decreasing amplitude
D.	oscillate with constant amplitude
Answer» C. oscillate with decreasing amplitude

Discussion

3781.	The friction experienced by a body, when at rest, is known as static friction.
A.	Yes
B.	No
Answer» B. No

Discussion

3782.	A spring controlled governor is said to be isochronous when the controlling force
A.	increases as the radius of rotation decreases
B.	increases as the radius of rotation increases
C.	decreases as the radius of rotation increases
D.	remains constant for all radii of rotation
Answer» E.

Discussion

3783.	In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. 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» C. reduce maximum opening of port to steam

Discussion

3784.	The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are complex conjugate, then the system will be critically damped.
A.	Yes
B.	No
Answer» C.

Discussion

3785.	The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.
A.	True
B.	False
Answer» B. False

Discussion

3786.	The maximum efficiency of spiral gears is (where = Shaft angle, and = Friction angle)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/493-255-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/493-255-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/493-255-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/493-255-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/493-255-4.png">

Discussion

3787.	When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-285-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-285-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-285-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-285-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/theory-of-machines/496-285-2.png">

Discussion

3788.	Which of the following governor is used to drive a gramophone?
A.	Watt governor
B.	Porter governor
C.	Pickering governor
D.	Hartnell governor
Answer» D. Hartnell governor

Discussion

3789.	In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/502-342-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/502-342-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/502-342-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/502-342-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/502-342-3.png">

Discussion

3790.	In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to
A.	minimise the effect of primary forces
B.	minimise the effect of secondary forces
C.	have perfect balancing
D.	to start the locomotive quickly
Answer» C. have perfect balancing

Discussion

3791.	A flywheel is used to control the mean speed of an engine caused by the variations in load.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

3792.	Power of a governor is the
A.	mean force exerted at the sleeve for a given percentage change of speed
B.	workdone at the sleeve for maximum equilibrium speed
C.	mean force exerted at the sleeve for maximum equilibrium speed
D.	none of the above
Answer» E.

Discussion

3793.	The power from the engine to the rear axle of an automobile is transmitted by means of
A.	worm and worm wheel
B.	spur gears
C.	bevel gears
D.	Hooke's joint
Answer» E.

Discussion

3794.	The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are __________ then the system will be under damped.
A.	equal
B.	real
C.	complex conjugate
Answer» D.

Discussion

3795.	A rotary internal combustion engine has __________ cylinders.
A.	four
B.	five
C.	six
D.	seven
Answer» E.

Discussion

3796.	The ratio of velocities of the shafts connected by Hooke's joint is given by (where N and N1 = Speed of driving and driven shafts (in r.p.m.) respectively, = Angle through which the arms of the cross turn, and = Angle of inclination between the two shafts)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/483-150-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/483-150-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/483-150-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/483-150-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/theory-of-machines/483-150-2.png">

Discussion

3797.	The ball and socket joint is an example of screw pair.
A.	Agree
B.	Disagree
Answer» C.

Discussion

3798.	A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
A.	magnitude of the forces on journal
B.	angular velocity of journal
C.	clearance between journal and bearing
D.	radius of journal
Answer» E.

Discussion

3799.	A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if
A.	the sum of the two masses is equal to the total mass of body
B.	the centre of gravity of the two masses coincides with that of the body
C.	the sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body
D.	all of the above
Answer» E.

Discussion

3800.	When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.
A.	same
B.	opposite
Answer» C.

Discussion

Explore topic-wise MCQs in Engineering.

The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

The partial balancing means

Which of the following statement is correct as regard to the difference between a machine and a structure?

The coriolis component of acceleration depends upon

Effort of a governor is the

The pressure angle for involute gears depends upon the size of teeth.

The maximum displacement of a body, from its mean position is called amplitude.

In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle , the angular velocity of the connecting rod is given by

The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

The stress induced in a body will be shear stress, when it is subjected to

When a body is subjected to longitudinal vibrations, the stress induced in a body will be tensile or compressive stress.

In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead.

A spring controlled governor is said to be unstable when the controlling force

A system of masses rotating in different parallel planes is in dynamic balance if the

The velocity of sliding __________ the distance of the point of contact from the pitch point.

The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

The critical speed of a shaft depends upon its

Which of the following mechanism is an approximate straight line motion mechanism?

Pitch point of a cam is

The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called

When the particles of a body moves perpendicular to its axis, then the body is said to have

In gears, interference takes place when

The ratio of maximum fluctuation of speed to the mean speed is called

Which of the following statement is correct for involute gears?

Under logarithmic decrement, the amplitude of successive vibrations are

A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

A shaft carrying two rotors at its ends will have

When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

The friction experienced by a body, when at rest, is known as static friction.

A spring controlled governor is said to be isochronous when the controlling force

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are complex conjugate, then the system will be critically damped.

The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.

The maximum efficiency of spiral gears is (where = Shaft angle, and = Friction angle)

When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

Which of the following governor is used to drive a gramophone?

In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

A flywheel is used to control the mean speed of an engine caused by the variations in load.

Power of a governor is the

The power from the engine to the rear axle of an automobile is transmitted by means of

The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are __________ then the system will be under damped.

A rotary internal combustion engine has __________ cylinders.

The ratio of velocities of the shafts connected by Hooke's joint is given by (where N and N1 = Speed of driving and driven shafts (in r.p.m.) respectively, = Angle through which the arms of the cross turn, and = Angle of inclination between the two shafts)

The ball and socket joint is an example of screw pair.

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.