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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

Correct Answer :

D. Ball bearing and roller bearing


Related Questions

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4

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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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

When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

A. Lower pair

B. Higher pair

C. Self-closed pair

D. Force-closed pair

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4

Any point on a link connecting double slider crank chain will trace a

A. Straight line

B. Circle

C. Ellipse

D. Parabola

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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

Ackermann steering gear consists of

A. Sliding pairs

B. Turning pairs

C. Rolling pairs

D. Higher pairs

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4

Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

A. Slow speed

B. Moderate speed

C. Highs peed

D. Any one of these

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4

The indicator using Watt mechanism is known as

A. Thompson indicator

B. Richard indicator

C. Simplex indicator

D. Thomson indicator

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4

The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

A. Dedendum

B. Addendum

C. Clearance

D. Working depth

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4

The secondary unbalanced force is maximum __________ in one revolution of the crank.

A. Two times

B. Four times

C. Eight times

D. Sixteen times

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4

Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

A. π (r₁ + r₂) + (r₁ + r₂)²/x + 2x

B. π (r₁ + r₂) + (r₁ - r₂)²/x + 2x

C. π (r₁ - r₂) + (r₁ - r₂)²/x + 2x

D. π (r₁ - r₂) + (r₁ + r₂)²/x + 2x

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4

In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crankpin C is given by

A. ω² × NO

B. ω² × CO

C. ω² × CN

D. ω² × QN

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4

The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

A. 0° and 90°

B. 90° and 180°

C. 135° and 315°

D. 270° and 360°

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4

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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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

Pulley in a belt drive acts as

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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4

A higher pair has__________.

A. Point contact

B. Surface contact

C. No contact

D. None of the above

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4

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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4

In a kinematic chain, a quaternary joint is equivalent to

A. One binary joint

B. Two binary joints

C. Three binary joints

D. Four binary joints

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4

For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

A. Maximum and zero

B. Zero and maximum

C. Minimum and maximum

D. Zero and minimum

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4

Which of the following would constitute a link?

A. Piston, piston rod and cross head

B. Piston and piston rod

C. Piston rod and cross head

D. Piston, crank pin and crank shaft

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4

The ratio of the driving tensions for V-belts is __________ times that of flat belts. (Where β = Semi-angle of the groove)

A. sinβ

B. cosβ

C. cosecβ

D. secβ

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4

It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

A. Universal joint

B. Knuckle joint

C. Oldham's coupling

D. Flexible coupling

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4

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. Infinity

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4

The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

A. Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

B. The Ackerman steering gear consists of turning pairs

C. The Ackerman steering gear is most economical

D. Both (A) and (B)

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4

The velocity of the belt for maximum power is (where m = Mass of the belt in kg per metre length)

A. T/3

B. (T.g)/3

C. √(T/3m)

D. √(3m/T)

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4

The coriolis component of acceleration is taken into account for

A. Slider crank mechanism

B. Four bar chain mechanism

C. Quick return motion mechanism

D. All of these

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4

When a point at the end of a link moves with constant angular velocity, 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 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

Which of the following is a lower pair?

A. Ball and socket i

B. Piston and cylinder

C. Cam and follower

D. Both (A) and (B) above