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Current Affairs January 2024

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4

The cam follower extensively used in aircraft engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

Correct Answer :

D. Roller follower


Related Questions

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4

Which one of the following loading is considered for the design of axles?

A. Bending moment only

B. Twisting moment only

C. Combined bending moment and twisting moments

D. Combined action of bending moment, twisting moment and axial thrust

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4

Antifriction bearings are

A. Sleeve bearings

B. Hydrodynamic bearings

C. Thin lubricated bearings

D. None of the above

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4

Screws used for power transmission should have

A. Low efficiency

B. High efficiency

C. Very fine threads

D. Strong teeth

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4

In skew bevel gearing, the axes of shafts are

A. Intersecting and the teeth are curved

B. Non-intersecting and nonparallel and the teeth are curved

C. Non-intersecting and non-parallel and the teeth are straight

D. None of the above

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4

The distribution of the forces along the length of key fitted in a shaft

A. Varies linearly

B. Is uniform throughout

C. Varies exponentially, being more near the torque-input end

D. Varies exponentially, being less near the torque-input end

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4

Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

A. Elastic strength

B. Yield strength

C. Shear strength

D. None of these

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4

A coupling used to connect two perfectly aligned shafts, is

A. Muff coupling

B. Compression coupling

C. Flange coupling

D. All of these

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4

Factor of safety for fatigue loading is the ratio of

A. Elastic limit to the working stress

B. Elastic limit to the yield point

C. Endurance limit to the working stress

D. Young's modulus to the ultimate tensile strength

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4

According to Rankine's theory, the failure occurs at a point in a member

A. When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test

B. When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test

C. When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test

D. When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

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4

The pitch of threads on a Jock nut in comparison to pitch of nut is

A. Same

B. Coarser

C. Finer

D. Very fine

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4

In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

A. Increase the key length

B. Increase the key depth

C. Increase the key width

D. Decrease the key length

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4

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

A. Remains constant at all speeds

B. Is minimum at zero speed and increases monotonically with increase in speed

C. Is maximum at zero speed and decreases monotonically with increase in speed

D. Becomes minimum at an optimum speed and then increases with further increase in speed

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4

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A. d

B. 1.5 d

C. 2.5 d

D. 2 d

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4

A single strap butt joint is always in __________ shear.

A. Single

B. Double

C. Triple share

D. None of these

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4

The material used for brake lining should have __________ coefficient of friction.

A. Low

B. High

C. Moderate

D. None of these

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4

A localised compressive stress at the area of contact between two members is known as

A. Tensile stress

B. Bending stress

C. Bearing stress

D. Shear stress

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4

The connecting rod bolts are tightened up with initial tension greater than the external load so that

A. Joint may not open up

B. Bolts are weakest elements

C. The resultant load on the bolt would not be affected by the external cyclic load

D. Bolts will not loosen during service

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4

Crowning on pulley helps

A. In decreasing the slip of the belt

B. In increasing the slip of the belt

C. To keep the belt in centre on a pulley while it is in motion

D. To increase pulley life

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4

The maximum bending stress in a curved beam having symmetrical section always occur at the

A. Centroidal axis

B. Neutral axis

C. Inside fibre

D. Outside fibre

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4

Eye bolts are used for

A. Foundation purposes

B. Absorbing shock and vibrations

C. Transmission of power

D. Lifting and transportation of machines and cubicles

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4

In a marine flange coupling, the thickness of flange is taken as

A. d/2

B. d/3

C. 3d/4

D. d/4

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4

A tap bolt

A. Has a head on one end and a nut fitted to the other

B. Has head at one end and other end fits into a tapped hole in the other part to be joined

C. Has both the ends threaded

D. Has pointed threads

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4

According to Indian standard specifications, a grey cast iron designated by 'FG 200' means that the

A. Carbon content is 2%

B. Maximum compressive strength is 200 N/mm²

C. Minimum tensile strength is 200 N/mm²

D. Maximum shear strength is 200 N/mm²

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4

An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load W. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

A. One-eighth

B. One-fourth

C. One-half

D. Double

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4

Taper on the cotter and slot is provided

A. On both the sides

B. On one side only

C. On none of the sides

D. May be provided anywhere

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4

The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

A. 12

B. 14

C. 18

D. 24

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4

The arms of the pulleys for flat belt drive have

A. Elliptical cross-section

B. Major axis in plane of rotation

C. Major axis twice the minor axis

D. All the three characteristics

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4

In a partial journal bearing, the angle of contact of the bearing with the journal is

A. 120°

B. 180°

C. 270°

D. 360°

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4

The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

A. Gerber relation

B. Soderberg relation

C. Goodman relation

D. None of these

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4

A V-belt designated as B 4430 LP has

A. 4430 mm as diameter of small pulley

B. 4430 mm as nominal pitch length

C. 4430 mm as diameter of large pulley

D. 4430 mm as centre distance between pulleys