THEORY OF STRUCTURES QUIZ

A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm²and that of brass bar is 3000 mm². These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm² and Eb = 0.1 MN/mm², the stresses developed are:

b = 10 N/mm² s = 20 N/mm 2

b = 8 N/mm² s = 16 N/mm²

b = 5 N/mm² s = 10 N/mm²

b = 6 N/mm² s = 12 N/mm²

TRUE ANSWER : ?
YOUR ANSWER : ?

A shaft rotating N.R.M. under a torque T, transmits a power

/60 Newton metres/sec

/60 Newton metres/min

/30 Newton metres/min

/30 Newton metres/sec

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of maximum shear stress to average shear stress of a circular beam, is

4/7

4/3

2/3

3/2

TRUE ANSWER : ?
YOUR ANSWER : ?

The equivalent length of a column of length L, having both the ends hinged, is

L/2

2L

L

S

TRUE ANSWER : ?
YOUR ANSWER : ?

The locus of reaction of a two hinged semi-circular arch, is

Straight line

Circle

Parabola

Hyperbola

TRUE ANSWER : ?
YOUR ANSWER : ?

A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm², the bending strain energy stored in the bar, is

711 N mm

611 N mm

411 N mm

511 N mm

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick up the incorrect statement from the following: The torsional resistance of a shaft is directly proportional to

Angle of twist

Moment of inertia of the shaft section

Reciprocal of the length of the shaft

Modulus of rigidity

TRUE ANSWER : ?
YOUR ANSWER : ?

Stress may be expressed in Newtons

Per millimetre square (N/mm²)

Per metre square (N/m2)

Per centimetre square (N/cm²)

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F, and elasticity stress and the depth of the neutral axis at section, then

M/I = R/E = F/Y

M/I = E/R = Y/F

I/M = R/E = F/Y

M/I = E/R = F/Y

TRUE ANSWER : ?
YOUR ANSWER : ?

The general expression for the B.M. of a beam of length l is the beam carries M = (wl/2) x – (wx²/2)

A load varying linearly from zero at one end to w at the other end

A uniformly distributed load w/unit length

None of these

An isolated load at mid span

TRUE ANSWER : ?
YOUR ANSWER : ?

↑