An automobile steering gear is an example of

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An automobile steering gear is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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Which one of the following is an exact straight line mechanism using lower pairs?

A. Watts mechanism

B. Grasshopper mechanism

C. Roberts mechanism

D. Peaucelliers mechanism

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The maximum velocity of a particle moving with simple harmonic motion is

A. ω

B. ωr

C. ω²r

D. ω/r

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If the pressure angle is __________, a reciprocating follower will jam in its bearings.

A. Small

B. Too small

C. Large

D. Too large

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When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

A. Free vibration

B. Forced vibration

C. Damped vibration

D. Under damped vibration

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The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

A. 0.4985/ √δS

B. 0.5615/ √δS

C. 0.571/ √δS

D. 0.6253/ √δS

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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. ω₁.ω₂.r

B. (ω₁ - ω₂) r

C. (ω₁ + ω₂) r

D. (ω₁ - ω₂) 2r

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A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

A. (1/2).Iω²

B. Iω²

C. (1/2). I ω ω_P

D. I ω ω_P

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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. m₁r₂ = m₂r₁

B. m₁r₁ = m₂r₂

C. m₁m₂ = r₁r₂

D. None of these

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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)

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A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

A. G.I₂

B. G².I₂

C. I₂/G

D. I₂/G²

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Angle of ascent of cam is defined as the angle

A. During which the follower returns to its initial position

B. Of rotation of the cam for a definite displacement of the follower

C. Through which the cam rotates during the period in which the follower remains in highest position

D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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Kinematic pairs are those which have

A. Point or line contact between the two elements when in motion

B. Surface contact between the two elements when in motion

C. Elements of pairs not held together mechanically

D. Two elements that permit relative motion

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A universal joint is an example of

A. Higher pair

B. Lower pair

C. Rolling pair

D. Sliding pair

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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

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A completely constrained motion can be transmitted with.

A. 1 link with pin joints

B. 2 links with pin joints

C. 3 links with pin joints

D. 4 links with pin joints

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

A. k_G + l₁

B. k_G² + l₁

C. (k_G² + l₁²)/ l₁

D. (k_G + l₁²)/ l₁

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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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Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

A. 18

B. 20

C. 30

D. 34

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A pulley and belt in a belt drive form a

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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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

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The magnitude of velocities of the points on a rigid link is

A. Directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre

B. Directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

C. Inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre

D. Inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

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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 balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

A. A single plane

B. Two planes

C. Three planes

D. Four planes

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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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Kinematic pairs are those which have two elements that

A. Have line contact

B. Have surface contact

C. Permit relative motion

D. Are held together

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The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

A. 3 Hz

B. 3π Hz

C. 6 Hz

D. 6π Hz

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When a body is subjected to transverse vibrations, the stress induced in a body will be

A. Shear stress

B. Bending stress

C. Tensile stress

D. Compressive stress

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The factor which affects the critical speed of a shaft is

A. Diameter of disc

B. Span of shaft

C. Eccentricity

D. All of these

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When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

A. Remains constant

B. Decreases

C. Increases

D. None of these

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Accepted Answer

C. Lower pair

An automobile steering gear is an example of

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

Which one of the following is an exact straight line mechanism using lower pairs?

The maximum velocity of a particle moving with simple harmonic motion is

If the pressure angle is __________, a reciprocating follower will jam in its bearings.

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

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 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 torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

Angle of ascent of cam is defined as the angle

Kinematic pairs are those which have

A universal joint is an example of

In gears, interference takes place when

A completely constrained motion can be transmitted with.

In a hydrodynamic journal bearing, there is

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

Hammer blow

Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

A pulley and belt in a belt drive form a

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 magnitude of velocities of the points on a rigid link is

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

The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

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

Kinematic pairs are those which have two elements that

The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

When a body is subjected to transverse vibrations, the stress induced in a body will be

The factor which affects the critical speed of a shaft is

When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

Also checkout

An automobile steering gear is an example of

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

Which one of the following is an exact straight line mechanism using lower pairs?

The maximum velocity of a particle moving with simple harmonic motion is

If the pressure angle is __________, a reciprocating follower will jam in its bearings.

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

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 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 torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

Angle of ascent of cam is defined as the angle

Kinematic pairs are those which have

A universal joint is an example of

In gears, interference takes place when

A completely constrained motion can be transmitted with.

In a hydrodynamic journal bearing, there is

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

Hammer blow

Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

A pulley and belt in a belt drive form a

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 magnitude of velocities of the points on a rigid link is

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

The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

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

Kinematic pairs are those which have two elements that

The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

When a body is subjected to transverse vibrations, the stress induced in a body will be

The factor which affects the critical speed of a shaft is

When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

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