MARATHA EMPIRE QUIZ

The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is

190 kg/cm²

260 kg/cm²

1400 kg/cm²

230 kg/cm²

TRUE ANSWER : ?
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If the depth of actual neutral axis of a doubly reinforced beam

Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier

Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously

Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier

All listed here

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If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[m/(m - r)] d

[(m + r)/m] d

[(r - m)/m] d

[m/(m + r)] d

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If Sb, is the average bond stress on a bar of diameter ‘d’ subjected to maximum stress ‘t’, the length of the embedment ‘l’ is given by

l = dt/4Sb

l = dt/3Sb

l = dt/2Sb

l = dt/Sb

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Pick up the assumption for the design of a pre-stressed concrete member from the following:

Variation of stress in reinforcement due to changes in external loading is negligible

All listed here

A transverse plane section remains a plane after bending

During deformation limits, Hook's law is equally applicable to concrete as well as to steel

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If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

R + T

T - R

R - T

√(R² + T²)

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In a singly reinforced beam, the effective depth is measured from its compression edge to

Tensile reinforcement

Neutral axis of the beam

Tensile edge

Longitudinal central axis

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An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus

UDL of wall + load from the roof

UDL of wall

Triangular load + load from the roof

Triangular load of the wall

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The maximum diameter of a bar used in a ribbed slab, is

12 mm

20 mm

6 mm

22 mm

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The self-weight of the footing, is

Also considered for calculating the upward pressure on footing

Not considered for calculating the area of the footing

Both (b) and (c)

Not considered for calculating the upward pressure on footing

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