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What is the correct answer?

4

According to maximum shear stress theory, the maximum shear stress in the shaft is

A. (1/2) × √(σ² + 4τ²)

B. √(σ² + 4τ²)

C. (1/2) × [σ + √(σ² + 4τ²)]

D. σ + √(σ² + 4τ²)

Correct Answer :

A. (1/2) × √(σ² + 4τ²)


Related Questions

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4

When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

A. 0.20

B. 0.35

C. 0.50

D. 0.65

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4

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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4

According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

A. Equating tearing resistance of the plate to the shearing resistance of the rivets

B. Equating tearing resistance of the plate to the crushing resistance of the rivets

C. Equating shearing resistance to the crushing resistance of the rivets

D. None of the above

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4

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

A. ZN/p

B. p/ZN

C. Z/pN

D. N/Zp

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4

The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

A. 0.01 micron

B. 0.1 micron

C. 1 micron

D. 10 microns

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4

Basic shaft is one

A. Whose upper deviation is zero

B. Whose lower deviation is zero

C. Whose lower as well as upper deviations are zero

D. Does not exist

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4

The following type of nut is used with alien bolt

A. Hexagonal nut

B. Slotted nut

C. Castle nut

D. Any one of the above

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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 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

In case of thick cylinders, the tangential stress across the thickness of cylinder is

A. Maximum at the outer surface and minimum at the inner surface

B. Maximum at the inner surface and minimum at the outer surface

C. Maximum at the inner surface and zero at the outer surface

D. Maximum at the outer surface and zero at the inner surface

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4

When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

A. Same

B. Double

C. One-half

D. One-fourth

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4

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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4

The coefficient of friction in belt drive depends upon

A. Material of belt

B. Material of pulley

C. Materials of belt and pulley

D. Belt velocity

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4

A feather key is generally

A. Loose in shaft and tight in hub

B. Tight in shaft and loose in hub

C. Tight in both shaft and hub

D. Loose in both shaft and hub

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4

The maximum shear stress theory is used for

A. Brittle materials

B. Ductile materials

C. Plastic materials

D. Nonferrous materials

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4

In worm gears, the pressure angle is ________ the angle between two inclined faces in axial plane.

A. Half

B. Twice

C. Thrice

D. None of these

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4

Aircraft body is usually fabricated by

A. Welding

B. Pre-casting

C. Riveting

D. Casting

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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

Rankine's theory is used for

A. Brittle materials

B. Ductile materials

C. Elastic materials

D. Plastic materials

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4

Silver based solder is used for

A. Flaring

B. Brazing

C. Soft soldering

D. Fusion welding

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4

The pipe joint mostly used for pipes carrying water at low pressures is

A. Socket joint

B. Nipple joint

C. Union joint

D. Spigot and socket joint

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4

A key made from a cylindrical disc having segmental cross-section, is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Gib head key

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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

If a material fails below its yield point, failure would be due to

A. Straining

B. Fatigue

C. Creep

D. Sudden loading

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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

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

A. 0.4 times

B. 0.6 times

C. 0.7 times

D. 0.8 times

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4

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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4

In standard taper roller bearings, the angle of taper of outer raceway is

A.

B.

C. 15°

D. 25°

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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

Which of the following statement is wrong for a connecting rod?

A. The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy

B. If Ixx > 4 Iyy, the buckling will occur about Y-axis

C. If Ixx < 4 Iyy, the buckling will occur about X-axis

D. The most suitable section for the connecting rod is T-section