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Current Affairs January 2024

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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

Correct Answer :

C. Goodman relation


Related Questions

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4

If threads on a bolt are left hand, threads on nut will be

A. Right hand with same pitch

B. Left hand with same pitch

C. Could be left or right hand

D. Right hand with fine pitch

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4

The radial distance of a tooth from the pitch circle to the top of the tooth is called

A. Addendum

B. Dedendum

C. Clearance

D. Working depth

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4

The static tooth load should be __________ the dynamic load.

A. Equal to

B. Less than

C. Greater than

D. None of these

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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

In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

A. The effect of curvature of the cylinder wall is neglected

B. The tensile stresses are uniformly distributed over the section of the walls

C. The effect of the restraining action of the heads at the end of the pressure vessel is neglected

D. All of the above

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4

In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

A. Equal to

B. Twice

C. Three times

D. Four times

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4

According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

A. 0.5 mm upto rivet diameter of 24 mm

B. 1 mm for rivet diameter from 27 mm to 36 mm

C. 2 mm for rivet diameter from 39 mm to 48 mm

D. All of the above

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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 coefficient of friction between the belt and pulley depends upon the

A. Material of belt and pulley

B. Slip of belt

C. Speed of belt

D. All of these

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4

A locking device extensively used in marine type connecting rod ends is a

A. Jam nut

B. Castle nut

C. Sawn nut

D. Ring nut

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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 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

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

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

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A. Twice

B. Four times

C. Eight times

D. Sixteen times

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4

The permissible stress for carbon steel under static loading is generally taken as

A. 2000-3000 kg/m²

B. 3000-4000 kg/cm²

C. 4000-4500 kg/cm²

D. 7500-10,000 kg/cm²

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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

The efficiency of a riveted joint is equal to

A. Pt /P

B. Ps /P

C. Pc /P

D. Least of Pt, Ps and Pc/P

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4

The tension on the slack side of the belt is __________ the tension on the tight side of the belt.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

Wire ropes as compared to cotton ropes

A. Are lighter in weight

B. Offer silent operation

C. Can withstand shock loads

D. All of these

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4

If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

A. 0.2

B. 0.25

C. 0.50

D. 0.6

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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

Applications in which stresses are encountered in one direction only uses following type of threads

A. Metric

B. Buttress

C. Acme

D. Square

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4

The cold working of metals is carried out __________ the recrystallisation temperature.

A. Above

B. Below

C. At

D. None of these

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4

A double fillet welded joint with parallel fillet weld of length l and leg s is subjected to a tensile force P. Assuming uniform stress distribution, the shear stress in the weld is given by

A. √2P/s.l

B. P/2.s.l

C. P/√2.s.l

D. 2P/s.l

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4

The spring mostly used in gramophones is

A. Helical spring

B. Conical spring

C. Flat spiral spring

D. Volute spring

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4

The taper on key is given on

A. Bottom side only

B. Top side only

C. On both sides

D. Any side

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4

A column is known as a long column if the slenderness ratio is

A. 40

B. 50

C. 70

D. 100

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4

A machine part subjected to __________ is called a strut.

A. An axial compressive force

B. A tangential force

C. An axial tensile force

D. Any one 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