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

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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

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A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become

A. t_p /16

B. t_p /4

C. 4 t_p

D. 16 t_p

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In a kinematic chain, a quaternary joint is equivalent to

A. One binary joint

B. Two binary joints

C. Three binary joints

D. Four binary joints

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

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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Which of the following is an open pair?

A. Journal bearing

B. Ball and Socket joint

C. Leave screw and nut

D. None of the above

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The two elements of a pair are said to form a _________ when they permit relative motion between them.

A. Open pair

B. Kinematic pair

C. Sliding pair

D. None of these

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The example of lower pair is

A. Shaft revolving in a bearing

B. Straight line motion mechanisms

C. Automobile steering gear

D. All of the above

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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

C. Unpredictable

D. None of these

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Torsional 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

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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 centre, and n = Ratio of length of connecting rod to the radius of crank)

A. ωr [sin θ + (sin 2θ/n)]

B. ωr [cos θ + (cos 2θ/n)]

C. ω²r [sin θ + (sin 2θ/n)]

D. ω²r [cos θ + (cos 2θ/n)]

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The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

A. Flexible coupling

B. Universal coupling

C. Chain coupling

D. Oldham's coupling

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3.The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

A. ω² × OQ

B. ω² × OQ sinθ

C. ω² × OQ cosθ

D. ω² × OQ tanθ

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Hammer blow

A. Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

B. Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

C. Varies as the square root of the speed

D. Varies inversely with the square of the speed

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In a pantograph, all the pairs are

A. Turning pairs

B. Sliding pairs

C. Spherical pairs

D. Self-closed pairs

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The lower pairs are __________ pairs.

A. Self-closed

B. Force-closed

C. Friction closed

D. None of these

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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

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The two elements of a pair are said to form a higher pair, when they

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. Permit relative motion

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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

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For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

A. Maximum and zero

B. Zero and maximum

C. Minimum and maximum

D. Zero and minimum

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Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

A. (l₁ + l₂ + l₃)/3

B. l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³

C. l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴

D. l₁ + l₂ + l₃

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A pantograph is a mechanism with

A. Lower pairs

B. Higher pairs

C. Rolling pairs

D. Turning pairs

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If ω/ω_n 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. 0°

B. 90°

C. 180°

D. 360°

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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

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In a hydrodynamic journal bearing, there is

A. A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing

B. A thick film of lubricant between the journal and the bearing

C. No lubricant between the journal and the bearing

D. A forced lubricant between the journal and the bearing

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Which of the following is a lower pair?

A. Ball and socket i

B. Piston and cylinder

C. Cam and follower

D. Both (A) and (B) above

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In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

A. Total lift, total angle of lift, minimum radius of cam and cam speed

B. Radius of circular arc, cam speed, location of centre of circular arc and roller diameter

C. Mass of cam follower linkage, spring stiffness and cam speed

D. Total lift, centre of gravity of the cam and cam speed

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If ω/ω_n = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

A. 0.5

B. 1

C. 1.5

D. 2

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A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

A. Free vibration with damping

B. Free vibration without damping

C. Forced vibration with damping

D. Forced vibration without damping

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A point on a link connecting double slider crank chain traces a

A. Ellipse

B. Circle

C. Parabola

D. Hyperbola

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For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A. Governor A is more sensitive than governor B

B. Governor B is more sensitive than governor A

C. Both governors A and B are equally sensitive

D. None of the above

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A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

A. ωv

B. 2ωv

C. ω²v

D. 2ωv²

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Accepted Answer

B. Parallel to its axis

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

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become

In a kinematic chain, a quaternary joint is equivalent to

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

Which of the following is an open pair?

The two elements of a pair are said to form a _________ when they permit relative motion between them.

The example of lower pair is

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.

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

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 centre, and n = Ratio of length of connecting rod to the 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

3.The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

Hammer blow

In a pantograph, all the pairs are

The lower pairs are __________ pairs.

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

The two elements of a pair are said to form a higher pair, when they

The coriolis component of acceleration depends upon

For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

A pantograph is a mechanism with

If ω/ω_n 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 spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis

In a hydrodynamic journal bearing, there is

Which of the following is a lower pair?

In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

If ω/ω_n = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

A point on a link connecting double slider crank chain traces a

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

Also checkout

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

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become

In a kinematic chain, a quaternary joint is equivalent to

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

Which of the following is an open pair?

The two elements of a pair are said to form a _________ when they permit relative motion between them.

The example of lower pair is

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.

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

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 centre, and n = Ratio of length of connecting rod to the 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

3.The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

Hammer blow

In a pantograph, all the pairs are

The lower pairs are __________ pairs.

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

The two elements of a pair are said to form a higher pair, when they

The coriolis component of acceleration depends upon

For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

A pantograph is a mechanism with

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

In a hydrodynamic journal bearing, there is

Which of the following is a lower pair?

In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

A point on a link connecting double slider crank chain traces a

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

Also checkout

If ω/ω_n 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/ω_n = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the