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 friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
If two moving elements have surface contact in motion, such pair is known as
If two moving elements have surface contact in motion, such pair is known as
A mechanism is an assemblage of
A mechanism is an assemblage of
The critical speed of a shaft depends upon its
The critical speed of a shaft depends upon its
For simple harmonic motion of the of follower, a cosine curve represents
For simple harmonic motion of the of follower, a cosine curve represents
The relative velocity of B with respect to A in a rigid link AB is
The relative velocity of B with respect to A in a rigid link AB is
Higher pairs are those which have
Higher pairs are those which have
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
The sensitiveness of the governor __________ as the speed range decreases.
The sensitiveness of the governor __________ as the speed range decreases.
A circular bar moving in a round hole is an example of
A circular bar moving in a round hole is an example of
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
Cylindrical cams can be classified as
Cylindrical cams can be classified as
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
A kinematic chain is known as a mechanism when
A kinematic chain is known as a mechanism when
Which of the following is a lower pair?
Which of the following is a lower pair?
Bifilar suspension method is used to find the
Bifilar suspension method is used to find the
Davis steering gear consists of
Davis steering gear consists of
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.
V-belts are usually used for
V-belts are usually used for
The frequency of oscillation at compared to earth will be
The frequency of oscillation at compared to earth will be
An automobile steering gear is an example of
An automobile steering gear is an example of
The cam and follower is an example of
The cam and follower is an example of
Kinematic pairs are those which have
Kinematic pairs are those which have
ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is
ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is
Which of the following is an example of sliding pair?
Which of the following is an example of sliding pair?
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
The Coriolis component of acceleration is taken into account for
The Coriolis component of acceleration is taken into account for
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism
Sensitiveness of the governor is defined as the ratio of the
Sensitiveness of the governor is defined as the ratio of the
Which of the following is an open pair?
Which of the following is an open pair?
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.
A cam mechanism imparts following motion
A cam mechanism imparts following motion
The direction of Coriolis component of acceleration is the direction
The direction of Coriolis component of acceleration is the direction
If the pressure angle is __________, a reciprocating follower will jam in its bearings.
If the pressure angle is __________, a reciprocating follower will jam in its bearings.
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
Ackermann steering gear consists of
Ackermann steering gear consists of
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is
The motion of a shaft in a circular hole is an example of
The motion of a shaft in a circular hole is an example of
Open pairs are those which have
Open pairs are those which have
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
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
Critical damping is a function of
Critical damping is a function of
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
A foot step bearing and rotor of a vertical turbine form examples of
A foot step bearing and rotor of a vertical turbine form examples of
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will
The lower pairs are _________ pairs.
The lower pairs are _________ pairs.
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
The driving and driven shafts connected by a Hooke's joint will have equal speeds, if
The driving and driven shafts connected by a Hooke's joint will have equal speeds, if
When brakes are applied to all the four wheels of a moving car, the distance traveled by the car before it is brought to rest, will be
When brakes are applied to all the four wheels of a moving car, the distance traveled by the car before it is brought to rest, will be
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
When the two elements of a pair have __________ when in motion, it is said to a lower pair.
When the two elements of a pair have __________ when in motion, it is said to a lower pair.
In a kinematic chain, a quaternary joint is equivalent to
In a kinematic chain, a quaternary joint is equivalent to
Governor is used in automobile to
Governor is used in automobile to
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.
Which type of gear train is used in clock mechanism to join hour hand and minute hand?
Which type of gear train is used in clock mechanism to join hour hand and minute hand?
Efficiency of a screw jack is given by
Efficiency of a screw jack is given by
The D-slide valve is also known as
The D-slide valve is also known as
A chain comprises of 5 links having 5 joints. Is it kinematic chain?
A chain comprises of 5 links having 5 joints. Is it kinematic chain?
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 spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.
Scotch yoke mechanism is used to generate
Scotch yoke mechanism is used to generate
A body is said to be under forced vibrations, when
A body is said to be under forced vibrations, when
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
A reed type tachometer use the principle of
A reed type tachometer use the principle of
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
Klein's construction can be used when
Klein's construction can be used when
Crowning on pulleys helps
Crowning on pulleys helps
A ball and a socket forms a
A ball and a socket forms a
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
The size of cam depends upon
The size of cam depends upon
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)
The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
In order to double the period of a simple pendulum, the length of the string should be
In order to double the period of a simple pendulum, the length of the string should be
The locus of a point on a thread unwound from a cylinder will be
The locus of a point on a thread unwound from a cylinder will be
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
For the same lift and same angle of ascent, a smaller base circle will give
For the same lift and same angle of ascent, a smaller base circle will give
The pressure angle of a cam depends upon
The pressure angle of a cam depends upon
The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
The direction of linear velocity of any point on a link with respect to another point on the same link is
The direction of linear velocity of any point on a link with respect to another point on the same link is
A circle passing through the pitch point with its center at the center of cam axis is known as
A circle passing through the pitch point with its center at the center of cam axis is known as
In a gear having involute teeth, the normal to the involute is a tangent to the
In a gear having involute teeth, the normal to the involute is a tangent to the
Lower pairs are those which have
Lower pairs are those which have
The unbalanced force due to revolving masses
The unbalanced force due to revolving masses
A pantograph is a mechanism with
A pantograph is a mechanism with
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)
Which of the following statement is correct as regard to the difference between a machine and a structure?
Which of the following statement is correct as regard to the difference between a machine and a structure?
Klein's construction gives a graphic construction for
Klein's construction gives a graphic construction for
The maximum fluctuation of energy is the
The maximum fluctuation of energy is the
The velocity of sliding of meshing gear teeth is
(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)
The velocity of sliding of meshing gear teeth is
(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)
A universal joint is an example of
A universal joint is an example of
In gears, interference takes place when
In gears, interference takes place when
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
Which of the following mechanism is obtained from lower pair?
Which of the following mechanism is obtained from lower pair?
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
The Klein's method of construction for reciprocating engine mechanism
The Klein's method of construction for reciprocating engine mechanism
The example of lower pair is
The example of lower pair is
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by
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
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
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
A shaft carrying three rotors will have
A shaft carrying three rotors will have
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces 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
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
