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What is the correct answer?

4

A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

A. 2

B. 3

C. 4

D. 5

Correct Answer :

C. 4


Related Questions

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4

In a ball bearing, ball and bearing forms a

A. Turning pair

B. Rolling pair

C. Screw pair

D. Spherical pair

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4

The C.G. of a link in any mechanism would experience

A. No acceleration

B. Linear acceleration

C. Angular acceleration

D. Both angular and linear accelerations

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4

The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

A. ω² R cosθ

B. ω² (R - r₁) cosθ

C. ω² (R - r₁) sinθ

D. ω² r₁ sinθ

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4

Higher 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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4

Which of the following is false statement in respect of differences between machine and structure?

A. Machines transmit mechanical work, whereas structures transmit forces

B. In machines, relative motion exists between its members, whereas same does not exist in case of structures

C. Machines modify movement and work, whereas structures modify forces

D. Efficiency of machines as well as structures is below 100%

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4

Which of the following statements regarding laws governing the friction between dry surfaces are correct?

A. The friction force is dependent on the materials of the contact surfaces.

B. The friction force is directly proportional to the normal force.

C. The friction force is independent of me area of contact.

D. All of the above

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4

The face of the tooth is the

A. Surface of the top of tooth

B. Surface of tooth above the pitch surface

C. Width of tooth below the pitch surface

D. Width of tooth measured along the pitch circle

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4

In a shaper mechanism, the Coriolis component of acceleration will

A. Not exist

B. Exist

C. Depend on position of crank

D. None of the above

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4

Which of the following is an open pair?

A. Ball and socket joint

B. Journal bearing

C. Lead screw and nut

D. Cam and follower

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4

Cam angle 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 the 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

Which of the following is an inversion of a double slider crank chain?

A. Oldham's coupling

B. Elliptical trammel

C. Scotch yoke mechanism

D. All of these

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4

When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.

A. Upward

B. Downward

C. Forward

D. Backward

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4

The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at

A. The centre of the disc

B. The point of contact

C. An infinite distance on the plane surface

D. The point on the circumference situated vertically opposite to the contact point

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4

The motion of a shaft in a circular hole is an example of

A. Completely constrained motion

B. Incompletely constrained motion

C. Successfully constrained motion

D. None of these

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4

A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

A. Straight line path

B. Hyperbolic path

C. Parabolic path

D. Elliptical path

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4

The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

A. Parallel to each other

B. Perpendicular to each other

C. Inclined at 45°

D. Opposite to each other

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4

The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

A. Less

B. More

C. Same

D. None of these

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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

The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

A. 0

B. 1

C. 2

D. -1

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4

Which of the following mechanisms produces mathematically an exact straight line motion?

A. Grasshopper mechanism

B. Watt mechanism

C. Peaucellier's mechanism

D. Tchebicheff mechanism

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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

The tendency of a body to resist change from rest or motion is known as

A. Mass

B. Friction

C. Inertia

D. Resisting force

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4

Oldhams coupling is an inversion of the kinematic chain used in

A. Whitworth quick return mechanism

B. Elliptical trammels

C. Rotary engine

D. Universal joint

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4

The minimum periodic time of a compound pendulum is

A. (1/2π). √(kG/g)

B. (1/2π). √(2kG/g)

C. 2π. √(kG/g)

D. 2π. √(2kG/g)

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4

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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4

The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

A. More than

B. Less than

C. Same as

D. None of these

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4

The maximum value of the pressure angle in case of cam is kept as

A. 10°

B. 14°

C. 20°

D. 30°

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4

The size of cam depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Pitch curve

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4

Efficiency of a screw jack is given by

A. tan (α + φ)/tanα

B. tanα/tan (α +φ)

C. tan (α - φ)/tanα

D. tanα/tan (α - φ)

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4

Crowning on pulleys helps

A. In increasing velocity ratio

B. In decreasing the slip of the belt

C. For automatic adjustment of belt position so that belt runs centrally

D. Increase belt and pulley life