RCC Structures Design

91. If p1 is the vertical intensity of pressure at a depth h on a block of earth weighing w per unit p2 is

1. wh (1 - cos )/(1 + )
2. wh (1 - sin )/(1 + )
3. wh (1 - tan )/(1 + )
4. w (1 - cos )/h (1 + sin )

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92. If permissible working stresses in steel and concrete are respectively 1400 kg/cm² and 80 kg/cm² and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is

1. 37 cm
2. 38 cm
3. 39 cm
4. 40 cm

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93. If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

1. D = W (a - b)/4a²bq
2. D = W (a² - b²)/4a²bq
3. D = W (a² - b²)/8a²bq
4. D = W (a² - b²)/4abq

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94. 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

1. R + T
2. T - R
3. √(R² + T²)
4. R - T

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95. If Sb, is the average bond stress on a bar of diameter 'd' subjected to maximum stress't', the length of the embedment ''is given by

1. l = dt/S_b
2. l = dt/2S_b
3. l = dt/3S_b
4. l = dt/4S_b

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96. If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

1. w (R + T)/T
2. w (R² + T²)/T
3. w (R + T)/T
4. w (R/T)

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97. If T and R are tread and rise respectively of a stair, then

1. 2R + T = 60
2. R + 2T = 60
3. 2R + T = 30
4. R + 2T = 30

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98. If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

1. 28 d
2. 38 d
3. 48 d
4. 58 d

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99. If the bearing capacity of soil is 10 tonnes/cm² and the projection of plain concrete footing from walls, is a cm, the depth D of footing is

1. D = 0.0775 a
2. D = 0.775 a
3. D = 0.775 a
4. D = 0.775 a²

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100. If the depth of actual neutral axis of a doubly reinforced beam

1. Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
2. Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
3. Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
4. All the above

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