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4

Length of arc of contact is given by

A. Arc of approach - Arc of recess

B. Arc of approach + Arc of recess

C. Arc of approach / Arc of recess

D. Arc of approach × Arc of recess

Correct Answer :

B. Arc of approach + Arc of recess


Related Questions

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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 example of rolling pair is

A. Bolt and nut

B. Lead screw of a lathe

C. Ball and socket joint

D. Ball bearing and roller bearing

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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

The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

A. l = 2p - 2

B. l = 2p - 3

C. l = 2p - 4

D. l = 2p - 5

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4

Scotch yoke mechanism is used to generate

A. Sine functions

B. Square roots

C. Logarithms

D. Inversions

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4

The following is the inversion of slider crank chain mechanism

A. Whitworth quick return mechanism

B. Hand pump

C. Oscillating cylinder engine

D. All of the above

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4

The motion between a pair which takes place in __________ is known as incompletely constrained motion.

A. One direction only

B. Two directions only

C. More than one direction

D. None of these

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4

The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)

A. c (m - M) g

B. c (m + M) g

C. c/(m + M) g

D. c/(m - M) g

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4

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

A. Magnitude of the forces on journal

B. Angular velocity of journal

C. Clearance between journal and bearing

D. Radius of journal

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4

The factional torque for square thread at the mean radius r while raising load W is given by

A. T = W.r tan(φ - α)

B. T = W.r tan(φ + α)

C. T = W.r tanα

D. T = W.r tanφ

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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

To connect two parallel and coplanar shafts the following type of gearing is used

A. Spur gear

B. Bevel gear

C. Spiral gear

D. None of the above

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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

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

The Klein's method of construction for reciprocating engine mechanism

A. Is a simplified version of instantaneous centre method

B. Utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

C. Enables determination of coriolis component

D. Is based on the acceleration diagram

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4

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

A. h/(kG² + h²)

B. (kG² + h²)/h

C. h²/(kG² + h²)

D. (kG² + h²)/h²

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4

V-belts are usually used for

A. Long drives

B. Short drives

C. Long and short drives

D. None of these

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4

Which gear train is used for higher velocity ratios in a small space?

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. Epicyclic gear train

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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

Which of the following is an inversion of Single slider crank chain?

A. Beam engine

B. Rotary engine

C. Oldhams coupling

D. Elliptical trammel

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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

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4

The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

A. Damping factor

B. Damping coefficient

C. Logarithmic decrement

D. Magnification factor

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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

For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

A. sinφ

B. cosφ

C. secφ

D. cosecφ

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4

When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

A. ω²r. (n + 1)/n

B. ω²r. (n - 1)/n

C. ω²r. n/(n + 1)

D. ω²r. n/(n - 1)

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4

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

A. Stable

B. Unstable

C. Isochronous

D. Hunt

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4

The sensitiveness of the governor __________ as the speed range decreases.

A. Remains unaffected

B. Decreases

C. Increases

D. None of these

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4

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

A. Will remain same

B. Will change

C. Could change or remain unaltered depending on which link is fixed

D. Will not occur

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4

In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

A. Critical damping ratio

B. Damping factor

C. Logarithmic decrement

D. Magnification factor

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4

In automobiles the power is transmitted from gear box to differential through

A. Bevel gear

B. Universal joint

C. Hooke's joint

D. Knuckle joint