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4

The absolute acceleration of any point P in a link about center of rotation O is

A. Along PO

B. Perpendicular to PO

C. At 45° to PO

D. None of the above

Correct Answer :

D. None of the above


Related Questions

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4

The power of a Porter governor is equal to

A. [c²/(1 + 2c)] (m + M) g.h

B. [2c²/(1 + 2c)] (m + M) g.h

C. [3c²/(1 + 2c)] (m + M) g.h

D. [4c²/(1 + 2c)] (m + M) g.h

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4

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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4

The working depth of a gear is the radial distance from the

A. Pitch circle to the bottom of a tooth

B. Pitch circle to the top of a tooth

C. Top of a tooth to the bottom of a tooth

D. Addendum circle to the clearance circle

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4

The maximum or minimum value of the swaying couple is

A. ± c.m.ω².r

B. ± a (1 - c) m.ω².r

C. ± (a/√2) (1 - c) m.ω².r

D. ± 2a (1 - c) m.ω².r

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4

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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4

The amplitude of vibration is always __________ the radius of the circle.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

In S.H.M., acceleration is proportional to

A. Velocity

B. Displacement

C. Rate of change of velocity

D. All of the above

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4

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

A. Four times the first one

B. Same as the first one

C. One fourth of the first one

D. One and a half times the first one

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4

In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

A. P = W tan(α - φ)

B. P = W tan(α + φ)

C. P = W tan(φ - α)

D. P = W cos(α + φ)

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4

The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

A. (1/2). μ W cosec α (r₁ + r₂)

B. (2/3).μ W cosec α (r₁ + r₂)

C. (1/2). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

D. (2/3). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

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4

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. (m.g + S₁)/(m.g + S₂) = r₁/r₂

B. (m.g - S₁)/(m.g - S₂) = r₂/r₁

C. S₁/S₂ = r₁/r₂

D. S₂/S₁ = r₁/r₂

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4

A spring controlled governor is found unstable. It can be made stable by

A. Increasing the spring stiffness

B. Decreasing the spring stiffness

C. Increasing the ball mass

D. Decreasing the ball mass

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4

In a steam engine, the distance by which the outer edge of the Dslide valve overlaps the steam port is called

A. Lead

B. Steam lap

C. Exhaust lap

D. None of these

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4

Which of the following statement is correct?

A. The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.

B. The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.

C. The velocity of a particle moving with simple harmonic motion is zero at the mean position.

D. The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.

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4

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

A. To move the ship towards starboard

B. To move the ship towards port side

C. To raise the bow and lower the stern

D. To raise the stern and lower the bow

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4

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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4

For dynamic balancing of a shaft

A. The net dynamic force acting on the shaft is equal to zero

B. The net couple due to the dynamic forces acting on the shaft is equal to zero

C. Both (A) and (B)

D. None of the above

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4

In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

A. Less sensitive

B. More sensitive

C. Unaffected of sensitivity

D. Isochronous

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4

Pulley in a belt drive acts as

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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4

Transmission angle is the angle between

A. Input link and coupler

B. Input link and fixed link

C. Output link and coupler

D. Output link and fixed link

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4

For simple harmonic motion of the of follower, a cosine curve represents

A. Displacement diagram

B. Velocity diagram

C. Acceleration diagram

D. All of the above

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4

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. tp /16

B. tp /4

C. 4 tp

D. 16 tp

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4

Effort of a governor is the

A. Mean force exerted at the sleeve for a given percentage change of speed

B. Workdone at the sleeve for maximum equilibrium speed

C. Mean force exerted at the sleeve for maximum equilibrium speed

D. None of the above

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4

In under damped vibrating system, the amplitude of vibration

A. Decreases linearly with time

B. Increases linearly with time

C. Decreases exponentially with time

D. Increases exponentially with time

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4

The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)

A. (1/2). μ W (r₁ + r₂)

B. (2/3). μ W (r₁ + r₂)

C. (1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

D. (2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

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4

When a point moves along a straight line, its acceleration will have

A. Radial component only

B. Tangential component only

C. Coriolis component only

D. Radial and tangential components both

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4

The brake commonly used in railway trains is

A. Shoe brake

B. Band brake

C. Band and block brake

D. Internal expanding brake

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4

Oldham's coupling is the

A. Second inversion of double slider crank chain

B. Third inversion of double slider crank chain

C. Second inversion of single slider crank chain

D. Third inversion of slider crank chain

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4

If D₁ and D₂ be the diameters of driver and driven pulleys, then belt speed is proportional to

A. D₁/D₂

B. D₂/D₁

C. D₁.D₂

D. D₁

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4

The example of successfully constrained motion is a

A. Motion of an I.C. engine valve

B. Motion of the shaft between a footstep bearing

C. Piston reciprocating inside an engine cylinder

D. All of the above