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4

Which is correct statement? Stress concentration in cyclic loading is

A. Very serious in brittle materials and less serious in ductile materials

B. Very serious in ductile materials and less serious in brittle materials

C. Equally serious in both types of materials

D. Seriousness would depend on other factors

Correct Answer :

C. Equally serious in both types of materials


Related Questions

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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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4

In a flange coupling, the bolts are subjected to

A. Tensile stress

B. Compressive stress

C. Shear stress

D. None of these

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4

The centre distance between two meshing involute gears is equal to

A. (Sum of base circle radii)/cosφ

B. (Difference of base circle radii)/cosφ

C. (Sum of pitch circle radii)/cosφ

D. (Difference of pitch circle radii)/cosφ

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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 screw is said to be over hauling screw, if its efficiency is

A. More than 50 %

B. Less than 50 %

C. Equal to 50 %

D. None of these

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4

The number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

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4

In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

A. Right hand

B. Left hand

C. Both A and B

D. None of these

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4

In leaf springs, the longest leaf is known as

A. Master leaf

B. Lower leaf

C. Upper leaf

D. None of these

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4

In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

A. Reduce vibration

B. Reduce slip

C. Ensure uniform loading

D. Ensure proper alignment

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4

The objective of caulking in a riveted joint is to make the joint

A. Free from corrosion

B. Stronger in tension

C. Free from stress

D. Leak-proof

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4

The connecting rod bolts are tightened up so that tightening stress

A. Is just sufficient to hold parts together

B. Approaches yield point

C. Is 50% of yield point

D. Is about yield point divided by safety factor

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4

The bearings of heavy series have capacity ________ over the medium series.

A. 20 to 30%

B. 10 to 20%

C. 30 to 40%

D. 40 to 50%

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4

The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to

A. 3 Pc

B. Pc

C. Pc/3

D. 2 Pc Where, Pc = tension in belt due to centrifugal force

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4

The centrifugal tension in belts

A. Decreases the power transmitted

B. Increases the power transmitted

C. Increase the wrap angle

D. Increases the belt tension without increasing power transmission

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4

The washer is generally specified by its

A. Outer diameter

B. Hole diameter

C. Thickness

D. Mean diameter

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4

The taper on cotter varies from

A. 1 in 24 to 1 in 20

B. 1 in 15 to 1 in 10

C. 1 in 32 to 1 in 24

D. 1 in 48 to 1 in 24

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4

The effective stress in wire ropes during normal working is equal to the stress due to

A. Axial load plus stress due to bending

B. Acceleration/retardation of masses plus stress due to bending

C. Axial load plus stress due to acceleration/retardation

D. Bending plus stress due to acceleration/retardation

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4

The material commonly used for machine tool bodies is

A. Mild steel

B. Aluminium

C. Brass

D. Cast iron

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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 stress induced in the belt is,

A. Tensile stress

B. Compressive stress

C. Direct shear stress

D. Torsional shear stress

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4

The process extensively used for making bolts and nuts is

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

A. Combined effect of transverse shear stress and bending stress in the wire

B. Combined effect of bending stress and curvature of the wire

C. Combined effect of transverse shear stress and curvature of wire

D. Combined effect of torsional shear stress and transverse shear stress in the wire

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4

Shear stress theory is applicable for

A. Ductile materials

B. Brittle materials

C. Elastic materials

D. All of the above

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4

The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

A. One-fourth

B. One-third

C. One-half

D. Double

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4

In order to remove internal stresses produced by hardening the steel, the process usually adopted is

A. Tempering

B. Normalising

C. Annealing

D. Spheroidising

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4

A crankshaft is a __________ shaft.

A. Transmission

B. Machine

C. Machine frame

D. None of these

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4

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

A. Thread

B. Middle

C. Shank

D. Head

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4

In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

A. d

B. 1.25 d

C. 1.5 d

D. 1.75 d

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4

Set screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between parts

D. Similar to stud

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4

The gears are termed as medium velocity gears, if their peripheral velocity is

A. 1-3 m/s

B. 3-15 m/s

C. 15-30 m/s

D. 30-50 m/s