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4

Stress concentration in cyclic loading is more serious in

A. Ductile materials

B. Brittle materials

C. Equally serious in both cases

D. Depends on other factors

Correct Answer :

A. Ductile materials


Related Questions

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4

The property of a material which enables it to resist fracture due to high impact loads is known as

A. Elasticity

B. Endurance

C. Strength

D. Toughness

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4

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

A. Decreasing the cross-section area of bar

B. Increasing the cross-section area of bar

C. Remain unaffected with cross-section area

D. Would depend upon other factors

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4

In the levers of first type, the mechanical advantage is __________ one.

A. Less than

B. Equal to

C. More than

D. None of these

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4

The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

A. T₁/T₂ = μθ

B. log (T₁/T₂) = μθ

C. T₁/T₂ =eμθ

D. T₁/T₂ = log μθ

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4

A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

A. 2.5

B. 2.8

C. 3.0

D. 3.5

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4

Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

A. Woodruff key

B. Feather key

C. Gib-head key

D. Tangent key

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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

If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

A. T sec3φ

B. T sec²φ

C. T/sec3φ

D. T cosecφ

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4

Which of the following screw thread is adopted for power transmission in either direction?

A. Acme threads

B. Square threads

C. Buttress threads

D. Multiple threads

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4

Which one of the following is a positive drive?

A. V-belt drive

B. Rope drive

C. Crossed flat belt drive

D. Chain drive

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4

The temperature at which the new grains are formed in the metal is known as

A. Lower critical temperature

B. Upper critical temperature

C. Recrystallisation temperature

D. None of these

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4

Resilience of a material is important, when it is subjected to

A. Combined loading

B. Fatigue

C. Thermal stresses

D. Shock loading

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4

The groove angle of pulleys for V-belt is

A. 340 to 360

B. 420 to 450

C. More than 400

D. 300 to 320

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4

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

A. Basic size is 100 mm

B. Actual size is 100 mm

C. Difference between the actual size and basic size is 100 mm

D. None of the above

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4

When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

A. Initial tension

B. External load applied

C. Sum of the initial tension and external load applied

D. Initial tension or external load, whichever is greater

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4

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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4

Pick up wrong statement. Fatigue strength can be increased by

A. Cold working

B. Shot peening

C. Grinding and lapping surface

D. Hot working

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4

When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

A. F/bh

B. 3F/2bh

C. 2F/bh

D. 4F/bh

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4

Fabric belts are used in industrial applications because

A. They are cheap

B. They can work at high temperature

C. They are unaffected by moisture and humidity

D. None of the above

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4

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

A. Hollow saddle key

B. Hollow key

C. Soft key

D. None of these

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4

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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4

Wahl's stress factor __________ very rapidly as the spring index decreases.

A. Increases

B. Decreases

C. Remain same

D. None of these

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4

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

A. Ring nut

B. Castle nut

C. Sawn nut

D. Jam nut

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4

The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to

A. 0.75/ (0.75 + √v)

B. 3/ (3 + v)

C. 4.5/ (4.5 + v)

D. 6/ (6 + v)

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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

In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

A. 0.5 times

B. Equal to

C. 2 times

D. Double

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4

Resistance to fatigue of a material is measured by

A. Young's modulus

B. Coefficient of elasticity

C. Elastic limit

D. Endurance limit

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4

The constant factor in case of R10 series of preferred numbers is

A. 1.06

B. 1.12

C. 1.26

D. 1.58

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4

In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called

A. Normal pitch

B. Axial pitch

C. Diametral pitch

D. Module

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4

Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

A. Brinell

B. Rockwell

C. Vickers

D. None of the above