4791 + Mcqs in Mechanical Engineering Page 82 McqOptions

4051.	The inversion of a mechanism is
A.	changing of a higher pair to a lower pair
B.	turning its upside down
C.	obtained by fixing different links in a kinematic chain
D.	obtained by reversing the input and output motion
Answer» D. obtained by reversing the input and output motion

Discussion

4052.	Critical damping is a function of
A.	mass and stiffness
B.	mass and damping coefficient
C.	mass and natural frequency
D.	damping coefficient and natural frequency
Answer» B. mass and damping coefficient

Discussion

4053.	A Porter governor can not be isochronous.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

4054.	The relation between me number of links (l) and the number of binary joints (j) for a kinematic chain having constrained motion is given by l = l - 2. If the left hand side of this equation is greater than the right hand side, then the chain is
A.	locked chain
B.	completely constrained chain
C.	successfully constrained chain
D.	incompletely constrained chain
Answer» B. completely constrained chain

Discussion

4055.	In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done
A.	because of difficulty in manufacturing cam profile
B.	because of loose contact of follower with cam surface
C.	in order to have acceleration in beginning and retardation at the end of stroke within the finite limits
D.	because the uniform velocity motion is a partial parabolic motion
Answer» D. because the uniform velocity motion is a partial parabolic motion

Discussion

4056.	The contact ratio for gears is
A.	zero
B.	less than one
C.	greater than one
D.	infinity
Answer» D. infinity

Discussion

4057.	In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the angle of advance of the eccentric but reducing the throw of the eccentric and keeping the steam lap and exhaust lap constant. This method will cause withdrawing or throttling of steam.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

4058.	A governor is said to be stable, if the
A.	radius of rotation of balls increases as the equilibrium speed decreases
B.	radius of rotation of balls decreases as the equilibrium speed decreases
C.	radius of rotation of balls increases as the equilibrium speed increases
D.	radius of rotation of balls decreases as the equilibrium speed increases
Answer» D. radius of rotation of balls decreases as the equilibrium speed increases

Discussion

4059.	In a Proell governor, the balls are attached to the extension of lower links.
A.	True
B.	False
Answer» B. False

Discussion

4060.	In vibration isolation system, if / n < 2, then for all values of damping factor, the trans-missibility will be (where = Angular speed of the system, n = Natural frequency of vibration of the system)
A.	less than unity
B.	equal to unity
C.	greater than unity
D.	zero
Answer» D. zero

Discussion

4061.	When the body is suspended at the point of suspension, its periodic time and frequency will be __________ as compared to the body suspended at the point of percussion.
A.	same
B.	two times
C.	four times
Answer» B. two times

Discussion

4062.	In a spring controlled governor, when the controlling force __________ as the radius of rotation increases, it is said to be a stable governor.
A.	remains constant
B.	decreases
C.	increases
Answer» D.

Discussion

4063.	In a gear having involute teeth, the normal to the involute is a tangent to the
A.	pitch circle
B.	base circle
C.	addendum circle
D.	dedendum circle
Answer» C. addendum circle

Discussion

4064.	A body is said to be under forced vibrations, when
A.	there is a reduction in amplitude after every cycle of vibration
B.	no external force acts on a body, after giving it an initial displacement
C.	a body vibrates under the influence of external force
D.	none of the above
Answer» B. no external force acts on a body, after giving it an initial displacement

Discussion

4065.	The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and = Static deflection of the body)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/513-458-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/513-458-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-467-1.png">
D.	any one of these
Answer» E.

Discussion

4066.	The wear of bearing is proportional to velocity and pressure.
A.	Yes
B.	No
Answer» B. No

Discussion

4067.	The module is the reciprocal of diametral pitch.
A.	True
B.	False
Answer» B. False

Discussion

4068.	If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be
A.	stable
B.	unstable
C.	isochronous
D.	none of these
Answer» D. none of these

Discussion

4069.	In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle , the angular acceleration of the connecting rod is given by
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-288-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-288-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-288-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/496-288-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/496-288-4.png">

Discussion

4070.	If the controlling force line for a spring controlled governor when produced intersects the Y-axis above the origin, then the governor is said to be unstable.
A.	Right
B.	Wrong
Answer» B. Wrong

Discussion

4071.	The product of the diametral pitch and module is equal to one.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

4072.	When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the
A.	tension in the tight side of the belt
B.	tension in the slack side of the belt
C.	sum of the tensions on the tight side and slack side of the belt
D.	average tension of the tight side and slack side of the belt
Answer» E.

Discussion

4073.	In a force-closed pair, the two elements of a pair are not held together mechanically.
A.	Agree
B.	Disagree
Answer» C.

Discussion

4074.	A body will begin to move down an inclined plane, if the angle of inclination of the plane is __________ the angle of friction.
A.	equal to
B.	less than
C.	greater than
Answer» D.

Discussion

4075.	The coriolis component of acceleration acts
A.	along the sliding surface
B.	perpendicular to the sliding surface
C.	at 45 to the sliding surface
D.	parallel to the sliding surface
Answer» C. at 45 to the sliding surface

Discussion

4076.	A reed type tachometer use the principle of
A.	longitudinal vibration
B.	torsional vibration
C.	transverse vibration
D.	damped free vibration
Answer» D. damped free vibration

Discussion

4077.	The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where = Static deflection of a simply supported shaft due to the point load)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-467-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-467-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-467-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/514-467-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/theory-of-machines/514-467-2.png">

Discussion

4078.	When the sleeve of a Porter governor moves upwards, the governor speed
A.	increases
B.	decreases
C.	remains unaffected
D.	first increases and then decreases
Answer» B. decreases

Discussion

4079.	A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard ?
A.	All points of the disc have the same velocity
B.	The centre of the disc has zero acceleration
C.	The centre of the disc has centrifugal acceleration
D.	The point on the disc making contact with the plane surface has zero acceleration
Answer» C. The centre of the disc has centrifugal acceleration

Discussion

4080.	A rotor supported at A and B carries two masses as shown in the below figure. The rotor is
A.	dynamically balanced
B.	statically balanced
C.	statically and dynamically balanced
D.	not balanced
Answer» D. not balanced

Discussion

4081.	For an isochronous Hartnell governor (where r1 and r2 = Maximum and minimum radius of rotation of balls respectively, S1 and S2 = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/503-358-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/503-358-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/503-358-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/503-358-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/theory-of-machines/503-358-2.png">

Discussion

4082.	When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be
A.	stable
B.	unstable
C.	isochronous
D.	hunt
Answer» E.

Discussion

4083.	When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the __________ pulley must be taken into consideration.
A.	smaller
B.	larger
Answer» B. larger

Discussion

4084.	The maximum frictional force, which comes into play, when an body just begins to slide over the surface of the other body, is known as
A.	static friction
B.	dynamic friction
C.	limiting friction
D.	coefficient of friction
Answer» D. coefficient of friction

Discussion

4085.	In a four stroke I.C. engine, the turning moment during the compression stroke is
A.	positive throughout
B.	negative throughout
C.	positive during major portion of the stroke
D.	negative during major portion of the stroke
Answer» C. positive during major portion of the stroke

Discussion

4086.	The coefficient of fluctuation of energy is the ratio of maximum energy to the minimum energy.
A.	True
B.	False
Answer» C.

Discussion

4087.	The velocity of a particle moving with simple harmonic motion, at any instant is given by (where = Displacement of the particle from mean position)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-82-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-82-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-82-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/477-82-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/477-82-3.png">

Discussion

4088.	The velocity of piston in a reciprocating steam engine is given by (where = Angular velocity of crank, r = Radius of crank pin circle, = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank)
A.	<img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-1.png">
B.	<img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-2.png">
C.	<img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-3.png">
D.	<img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-2.png">

Discussion

4089.	When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a
A.	screw pair
B.	spherical pair
C.	turning pair
D.	sliding pair
Answer» E.

Discussion

4090.	The time taken by a particle for one complete oscillationis known as periodic time.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

4091.	The sensitiveness of the governor __________ as the speed range decreases.
A.	remains unaffected
B.	decreases
C.	increases
Answer» D.

Discussion

4092.	In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
A.	50 - 60
B.	60 - 70
C.	70 - 80
D.	80 - 90
Answer» E.

Discussion

4093.	If the damping factor for a vibrating system is unity, then the system will be
A.	over damped
B.	under damped
C.	critically damped
D.	without vibrations
Answer» D. without vibrations

Discussion

4094.	When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
A.	simple pendulum
B.	compound pendulum
C.	torsional pendulum
D.	second's pendulum
Answer» C. torsional pendulum

Discussion

4095.	Longitudinal vibrations are said to occur when the particles of a body moves
A.	perpendicular to its axis
B.	parallel to its axis
C.	in a circle about its axis
D.	none of these
Answer» C. in a circle about its axis

Discussion

4096.	The viscosity of a liquid is due to cohesion of its particles.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

4097.	A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
A.	length of both the pipes is same
B.	diameter of both the pipes is same
C.	loss of head and discharge of both the pipes is same
D.	loss of head and velocity of flow in both the pipes is same
Answer» D. loss of head and velocity of flow in both the pipes is same

Discussion

4098.	In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
A.	double
B.	four times
C.	eight times
D.	sixteen times
Answer» B. four times

Discussion

4099.	The viscosity of water is __________ than that of mercury.
A.	higher
B.	lower
Answer» B. lower

Discussion

4100.	The flow at critical depth in an open channel is called torrential flow.
A.	Yes
B.	No
Answer» C.

Discussion

Explore topic-wise MCQs in Engineering.

The inversion of a mechanism is

Critical damping is a function of

A Porter governor can not be isochronous.

The relation between me number of links (l) and the number of binary joints (j) for a kinematic chain having constrained motion is given by l = l - 2. If the left hand side of this equation is greater than the right hand side, then the chain is

In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

The contact ratio for gears is

In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the angle of advance of the eccentric but reducing the throw of the eccentric and keeping the steam lap and exhaust lap constant. This method will cause withdrawing or throttling of steam.

A governor is said to be stable, if the

In a Proell governor, the balls are attached to the extension of lower links.

In vibration isolation system, if / n &lt; 2, then for all values of damping factor, the trans-missibility will be (where = Angular speed of the system, n = Natural frequency of vibration of the system)

When the body is suspended at the point of suspension, its periodic time and frequency will be __________ as compared to the body suspended at the point of percussion.

In a spring controlled governor, when the controlling force __________ as the radius of rotation increases, it is said to be a stable governor.

In a gear having involute teeth, the normal to the involute is a tangent to the

A body is said to be under forced vibrations, when

The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and = Static deflection of the body)

The wear of bearing is proportional to velocity and pressure.

The module is the reciprocal of diametral pitch.

If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be

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

If the controlling force line for a spring controlled governor when produced intersects the Y-axis above the origin, then the governor is said to be unstable.

The product of the diametral pitch and module is equal to one.

When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

In a force-closed pair, the two elements of a pair are not held together mechanically.

A body will begin to move down an inclined plane, if the angle of inclination of the plane is __________ the angle of friction.

The coriolis component of acceleration acts

A reed type tachometer use the principle of

The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where = Static deflection of a simply supported shaft due to the point load)

When the sleeve of a Porter governor moves upwards, the governor speed

A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard ?

A rotor supported at A and B carries two masses as shown in the below figure. The rotor is

For an isochronous Hartnell governor (where r1 and r2 = Maximum and minimum radius of rotation of balls respectively, S1 and S2 = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the __________ pulley must be taken into consideration.

The maximum frictional force, which comes into play, when an body just begins to slide over the surface of the other body, is known as

In a four stroke I.C. engine, the turning moment during the compression stroke is

The coefficient of fluctuation of energy is the ratio of maximum energy to the minimum energy.

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where = Displacement of the particle from mean position)

The velocity of piston in a reciprocating steam engine is given by (where = Angular velocity of crank, r = Radius of crank pin circle, = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank)

When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

The time taken by a particle for one complete oscillationis known as periodic time.

The sensitiveness of the governor __________ as the speed range decreases.

In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

If the damping factor for a vibrating system is unity, then the system will be

When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Longitudinal vibrations are said to occur when the particles of a body moves

The viscosity of a liquid is due to cohesion of its particles.

A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

The viscosity of water is __________ than that of mercury.

The flow at critical depth in an open channel is called torrential flow.

In vibration isolation system, if / n < 2, then for all values of damping factor, the trans-missibility will be (where = Angular speed of the system, n = Natural frequency of vibration of the system)