In a three hinged arch, the bending moment will be zero at right hinge only at l

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Question
In a three hinged arch, the bending moment will be zero
Options
A. at right hinge only
B. at left hinge only
C. at both right and left hinges
D. at all the three hinges.

Correct Answer

at all the three hinges.

Strength of Materials problems

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4. The section modulus of a rectangular light beam 25 metres long is 12.500 cm³. The beam is simply supported at its ends and carries a longitudinal axial tensile load of 10 tonnes in addition to a point load of 4 tonnes at the centre. The maximum stress in the bottom most fibre at the mid span section, is
Options
A. 13.33 kg/cm² tensile
B. 13.33 kg/cm² compressive
C. 26.67 kg/cm² tensile
D. 26.67 kg/cm² compressive
E. none of these.

8. The stress at which extension of a material takes place more quickly as compared to the increase in load, is called
Options
A. elastic point
B. plastic point
C. breaking point
D. yielding point.

9. A composite member shown in below figure was formed at 25�C and was made of two materials a and b. If the coefficient of thermal expansion of a is more than that of b and the composite member is heated upto 45�C, then
Options
A. a will be in tension and b in compression
B. both will be in compression
C. both will be in tension
D. a will be in compression and b in tension.

10. A joint of a frame is subjected to three tensile force P, Q and R equally inclined to each other. If P is 10 tonnes, the other forces will be
Options
A. Q = 10 tonnes and R = zero
B. R + 10 tonnes and Q = zero
C. Q + R = 10 tonnes
D. Q - R = zero
E. Q and R each is equal to 10 tonnes.

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