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4

If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by

A. A = My/fr²

B. A = My²/fr²

C. A = My/fr

D. A = My/f²r²

Correct Answer :

A. A = My/fr²


Related Questions

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4

As compared to field rivets, the shop rivets are

A. Stronger

B. Weaker

C. Equally strong

D. Any of the above

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4

Stiffeners are used in a plate girder

A. To reduce the compressive stress

B. To reduce the shear stress

C. To take the bearing stress

D. To avoid bulking of web plate

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4

Net sectional area of a tension member, is equal to its gross section area

A. Plus the area of the rivet holes

B. Divided by the area of rivet holes

C. Multiplied by the area of the rivet holes

D. None of these

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4

In a fillet weld placed on the sides of the base, the metal experiences

A. Shear

B. Tension

C. Compression

D. All the above

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4

The allowable stress in axial tension for rolled I-sections and channels, is taken as

A. 1420 kg/cm2

B. 1500 kg/cm2

C. 2125 kg/cm2

D. 1810 kg/cm2

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4

The strength of a riveted lap joint is equal to its

A. Shearing strength

B. Bearing strength

C. Tearing strength

D. Least of (a), (b) and (c)

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4

Cold driven rivets range from

A. 6 to 10 mm in diameter

B. 10 to 16 mm in diameter

C. 12 to 22 mm in diameter

D. 22 to 32 mm in diameter

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4

Tacking rivets in tension members, are provided at a pitch in line not exceeding

A. 25 cm

B. 50 cm

C. 75 cm

D. 100 cm

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4

The tensile strength of mild steel for bolts and nuts should not be less than

A. 32 kg/mm2

B. 36 kg/mm2

C. 40 kg/mm2

D. 44 kg/mm2

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4

If the unsupported length of a stanchion is 4 metres and least radius of gyration of its cross-section is 5, the slenderness ratio of the stanchion, is

A. 60

B. 70

C. 80

D. 100

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4

The minimum pitch of rivet holes of diameter d should not be less than

A. d

B. 1.25 d

C. 1.5 d

D. 2.5 d

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4

The strength of ISA 125 = 75 × 10 mm used as a tie member with its longer leg connected at the ends by 27 mm diameter rivets, is

A. 26,000 kg

B. 26,025 kg

C. 26,050 kg

D. 26,075 kg

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4

Secant formula for direct stress in compression, is applicable only for slenderness ratio upto

A. 120

B. 130

C. 140

D. 150

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4

Pick up the correct statement from the following:

A. Dead load includes self-weight of the structure and super-imposed loads permanently attached to the structure

B. Dead loads change their positions and vary in magnitude

C. Dead loads are known in the beginning of the design

D. None of these

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4

Which of the following types of riveted joint is free from bending stresses?

A. Lap joint

B. Butt joint with single cover plate

C. Butt joint with double cover plates

D. None of the above

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4

The risk coefficient k, depends on

A. Mean probable design life of structures

B. Basic wind speed

C. Both (A) and (B)

D. None of the above

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4

The bracing between two columns of a steel tank will be designed to resist

A. Horizontal shear due to wind or earthquake only

B. Horizontal, shear due to wind or earthquake + 2.5% of column loads

C. Column loads + 2.5% of horizontal shear due to wind or earthquake

D. Column loads + full horizontal shear due to wind or earthquake

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4

The rivets which are heated and then driven in the field, are known

A. Power driven shop rivets

B. Power driven field rivets

C. Hand driven rivets

D. Cold driven rivets

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4

The cross-section of a standard fillet is a triangle whose base angles are

A. 45° and 45°

B. 30° and 60°

C. 40° and 50°

D. 20° and 70°

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4

The number of seismic zones in which the country has been divided is

A. 3

B. 5

C. 6

D. 7

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4

If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be

A. 16 mm

B. 20 mm

C. 24 mm

D. 27 mm

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4

Generally the purlins are placed at the panel points so as to avoid

A. Axial force in rafter

B. Shear force in rafter

C. Deflection of rafter

D. Bending moment in rafter

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4

Design of a riveted joint is based on the assumption:

A. Bending stress in rivets is accounted for

B. Riveted hole is assumed to be completely filled by the rivet

C. Stress in the plate in not uniform

D. Friction between plates is taken into account

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4

For a cantilever beam of length L built-in at the support and restrained against torsion at the free end, the effective projecting length l is

A. l = 0.7 L

B. l = 0.75 L

C. l = 0.85 L

D. l = 0.5 L

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4

Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for

A. Bearing and shear

B. Bending and shear

C. Bearing and bending

D. Bearing, shear and bending

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4

The main type of butt joints, is a double cover

A. Shear riveted joint

B. Chain riveted joint

C. Zig-zag riveted joint

D. All the above

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4

The greatest permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to

A. 180 t

B. 220 t

C. 230 t

D. 270 t

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4

As per IS : 800, for compression flange, the outstand of flange plates should not exceed

A. 12 t

B. 16 t

C. 20 t

D. 25 t Where t = thickness of thinnest flange plate

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4

If the depth of two column sections is equal, then the column splice is provided

A. With filler plates

B. With bearing plates

C. With filler and hearing plates

D. None of these

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4

Hudson's formula gives the dead weight of a truss bridge as a function of

A. Bottom chord area

B. Top chord area

C. Effective span of bridge

D. Heaviest axle load of engine