57. A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,

A. 10 m

B. 12 m

C. 14m

D. 16 m

58. A simply supported rolled steel joist 8 m long carries a uniformly distributed load over it span so that the maximum bending stress is 75 N/mm2. If the slope at the ends is 0.005 radian and the value of E = 0.2 x 106 N/mm2, the depth of the joist, is

A. 200 mm

B. 250 mm

C. 300 mm

D. 400 mm.

59. A truss containing j joints and m members, will be a simple truss if

A. m = 2j ? 3

B. j = m ? 3

C. m = 3j ? 2

D.j = 3m ? 2.

60. A compound truss may be formed by connecting two simple rigid frames, by

A. two bars

B. three bars

C. three parallel bars

D. three bars intersecting at a point.

61. mi and m2 are the members of two individual simple trusses of a compound truss. The compound truss will be rigid and determinate if

A. ,n = + m2

B. m = mi + m2 + 1

C. m = m1 + m2 + 2

D. m = m1 + m2 + 3.

62. The forces in the members of simple trusses, may be analysed by

A. graphical method

B. method of joints

C.method of sections

D. all the above.

63. In a shaft, the shear stress is not directly proportional to

A. radius of the shaft

B. angle of twist

C. length of the shaft

D. modulus of rigidity.

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