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The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

A. Static load

B. Dynamic load

C. Static as well as dynamic load

D. Completely reversed load

Correct Answer :

D. Completely reversed load


Related Questions

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Yield point in fatigue loading as compared to static loading is

A. Same

B. Higher

C. Lower

D. Depends on other factors

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When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

A. 10 times

B. 5 times

C. 15 times

D. 20 times

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Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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4

In designing thick cylinders, the equation used is

A. Lame's equation

B. Birnie's equation

C. Clavarinos' equation

D. All of these

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The resultant axial load on a bolt depends on

A. Initial tension

B. External load applied

C. Relative elastic yielding (springness) of the bolt and the connected member

D. All of the above

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The size of a cam depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Pitch curve

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Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

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A backing ring is used inside the pipe joint when making a

A. Butt weld

B. Fillet weld

C. Sleeve weld

D. Socket weld

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The sleeve or muff coupling is designed as a

A. Dun cylinder

B. Hollow shaft

C. Solid shaft

D. Thick cylinder

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According to Indian standard specifications, 100 H6/g5 means that

A. Tolerance grade for the hole is 6 and for the shaft is 5

B. Tolerance grade for the shaft is 6 and for the hole is 5

C. Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

D. Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

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If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

A. Have same value as that of standard specimen

B. Increase

C. Decrease

D. None of these

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4

In second type of levers,

A. Load is in between the fulcrum and effort

B. Effort is in between the fulcrum and load

C. Fulcrum is in between the load and effort

D. None of these

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A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

A. Partially

B. Fully

C. Either A or B

D. None of these

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The fatigue life of a part can be improved by

A. Electroplating

B. Polishing

C. Coating

D. Shot peening

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Which of the following statement is correct for gears?

A. The pitch circle diameter is equal to the product of module and number of teeth

B. The addendum is less than dedendum

C. The pitch circle is always greater than the base circle

D. All of the above

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The largest diameter of an external or internal screw thread is known as

A. Minor diameter

B. Major diameter

C. Pitch diameter

D. None of these

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Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

A. Shaft B is better than shaft A

B. Shaft A is better than shaft B

C. Both the shafts are equally good

D. None of these

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Stress concentration factor is defined as the ratio of

A. Maximum stress to the endurance limit

B. Nominal stress to the endurance limit

C. Maximum stress to the nominal stress

D. Nominal stress to the maximum stress

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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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The lower deviation is the algebraic difference between the

A. Actual size and the corresponding basic size

B. Maximum limit and the basic size

C. Minimum limit and the basic size

D. None of the above

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Which process will increase the fatigue duration of parts?

A. Finishing and polishing

B. Shotpeening

C. De-carburisation

D. Electroplating

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The endurance limit of a material with finished surface in comparison to rough surface is

A. More

B. Less

C. Same

D. More or less depending on quantum of load

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Auto frettage is the method of

A. Joining thick cylinders

B. Calculating stresses in thick cylinders

C. Pre-stressing thick cylinders

D. Increasing the life of thick cylinders

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When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

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In a gear, having Involute teeth, the normal to the Involute is a tangent to the

A. Base circle

B. Pitch circle

C. Addendum circle

D. Dedendum circle

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In composite or reverse laid ropes

A. Direction of twist of wires in strands is opposite to the direction of twist of strands

B. Direction of twist of wires and strands are same

C. Wires in two adjacent strands are twisted in opposite direction

D. Wires are not twisted

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In a full 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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Crushing resistance required to crush the rivet per pitch length is

A. p.d.σc

B. p.t.σc

C. n.d.t.σc

D. (p - d) t.σc

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In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

A. 2d

B. 3d

C. 4d

D. 5d

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The included angle between the sides of V-belt is

A. 40°

B. 45°

C. 38°

D. 60°