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

Question

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

Share this question with your friends

Show all Theory of Machines MCQ

Comment

Which of the following property of the instantaneous centre is correct?

A. A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.

B. The two rigid links have no linear velocity relative to each other at the instantaneous centre.

C. The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.

D. All of the above

Discuss this answer

For the brake to be self locking, the force P at C shown in the below figure, should

A. Be zero

B. Act in upward direction

C. Act in downward direction

D. None of these

Discuss this answer

The lower pairs are __________ pairs.

A. Self-closed

B. Force-closed

C. Friction closed

D. None of these

Discuss this answer

The centre distance between two meshing involute gears is equal to

A. Sum of base circle radii/cosφ

B. Difference of base circle radii/ cosφ

C. Sum of pitch circle radii/ cosφ

D. Difference of pitch circle radii/ cosφ

Discuss this answer

The pressure angle of a cam depends upon

A. Offset between centre lines of cam and follower

B. Lift of follower

C. Angle of ascent

D. All of the above

Discuss this answer

To obviate axial thrust, following gear drive is used

A. Double helical gears having opposite teeth

B. Double helical gears having identical teeth

C. Single helical gear in which one of the teeth of helix angle a is more

D. Mutter gears

Discuss this answer

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

Discuss this answer

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

A. m.ω².r cosθ

B. c.m.ω².r sinθ

C. (1 - c).m.ω².r (cosθ - sinθ)

D. m.ω².r (cosθ - sinθ)

Discuss this answer

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

Discuss this answer

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

Discuss this answer

The total number of instantaneous centres for a mechanism consisting of n links are

A. n/2

B. n

C. n - 1

D. n(n - 1)/2

Discuss this answer

Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?

A. Theory of machines

B. Applied mechanics

C. Mechanisms

D. Kinetics

Discuss this answer

The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

A. R (1 - cosθ)

B. (R - r₁) (1 - cosθ)

C. R (1 - sinθ)

D. (R - r₁) (1 - sinθ)

Discuss this answer

A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

A. Structure

B. Mechanism

C. Kinematic chain

D. Inversion

Discuss this answer

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

A. 0.4985/√δ

B. 0.5615/√δ

C. 0.571/√δ

D. 0.6253/√δ

Discuss this answer

Angular acceleration of a link can be determined by dividing the

A. Centripetal component of acceleration with length of link

B. Tangential component of acceleration with length of link

C. Resultant acceleration with length of link

D. All of the above

Discuss this answer

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

A. 95 mm

B. Slightly less than 95 mm

C. Slightly more than 95 mm

D. 45 mm

Discuss this answer

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

A. 2 W C_E / C_S

B. W C_E / 2C_S

C. W C_E / C_S

D. W C_S / 2C_E

Discuss this answer

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

Discuss this answer

In a flat collar pivot bearing, the moment due to friction is proportional to

A. (r₁² - r₂²)/(r₁ - r₂)

B. (r₁² - r₂²)/(r₁ + r₂)

C. (r₁³ - r₂³)/(r₁² - r₂²)

D. (r₁³ - r₂³)/(r₁ - r₂)

Discuss this answer

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

Discuss this answer

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

Discuss this answer

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

Discuss this answer

The unbalanced primary forces in a reciprocating engine are

A. Balanced completely

B. Balanced partially

C. Balanced by secondary forces

D. Not balanced

Discuss this answer

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. a is +ve and b = 0

B. a = 0 and b is +ve

C. a is +ve and b is -ve

D. a is +ve and b is also +ve

Discuss this answer

There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

A. 1/24

B. 1/8

C. 4/15

D. 12

Discuss this answer

In order to balance the reciprocating masses,

A. Primary forces and couples must be balanced

B. Secondary forces and couples must be balanced

C. Both (A) and (B)

D. None of these

Discuss this answer

Instantaneous center of rotation of a link in a four bar mechanism lies on

A. Right side pivot of this link

B. Left side pivot of this link

C. A point obtained by intersection on extending adjoining links

D. Cant occur

Discuss this answer

Which of the following is a higher pair?

A. Turning pair

B. Screw pair

C. Belt and pulley

D. None of the above

Discuss this answer

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

Discuss this answer

Accepted Answer

C. Torsional vibrations

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

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

Which of the following property of the instantaneous centre is correct?

For the brake to be self locking, the force P at C shown in the below figure, should

The lower pairs are __________ pairs.

The centre distance between two meshing involute gears is equal to

The pressure angle of a cam depends upon

To obviate axial thrust, following gear drive is used

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

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

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.

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

The total number of instantaneous centres for a mechanism consisting of n links are

Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?

The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

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

Angular acceleration of a link can be determined by dividing the

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

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

Hammer blow

In a flat collar pivot bearing, the moment due to friction is proportional to

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

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

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

The unbalanced primary forces in a reciprocating engine are

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

There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

In order to balance the reciprocating masses,

Instantaneous center of rotation of a link in a four bar mechanism lies on

Which of the following is a higher pair?

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

Also checkout

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

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

Which of the following property of the instantaneous centre is correct?

For the brake to be self locking, the force P at C shown in the below figure, should

The lower pairs are __________ pairs.

The centre distance between two meshing involute gears is equal to

The pressure angle of a cam depends upon

To obviate axial thrust, following gear drive is used

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

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

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.

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

The total number of instantaneous centres for a mechanism consisting of n links are

Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?

The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

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

Angular acceleration of a link can be determined by dividing the

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

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

Hammer blow

In a flat collar pivot bearing, the moment due to friction is proportional to

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

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

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

The unbalanced primary forces in a reciprocating engine are

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

There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

In order to balance the reciprocating masses,

Instantaneous center of rotation of a link in a four bar mechanism lies on

Which of the following is a higher pair?

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

Also checkout

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