RCC Structures Design

61. For initial estimate for a beam design, the width is assumed

1. 1/15th of span
2. 1/20th of span
3. 1/25th of span
4. 1/30th of span

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62. For M 150 grade concrete (1:2:4) the moment of resistance factor is

1. 0.87
2. 8.5
3. 7.5
4. 5.8

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63. For M 150 mix concrete, according to I.S. specifications, local bond stress, is

1. 5 kg/cm²
2. 10 kg/cm²
3. 15 kg/cm²
4. 20 kg/cm²

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64. For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed

1. 10
2. 15
3. 20
4. 25

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65. For stairs spanning horizontally, the minimum waist provided is

1. 4 cm
2. 6 cm
3. 8 cm
4. 12 cm

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66. For stairs spanning 'l' metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

1. wl²/4
2. wl²/8
3. wl²/12
4. wl²/16

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67. For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to

1. 10
2. 15
3. 20
4. 25

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68. High strength concrete is used in pre-stressed member

1. To overcome high bearing stresses developed at the ends
2. To overcome bursting stresses at the ends
3. To provide high bond stresses
4. All the above

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69. If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least

1. WL/P
2. WL/2P
3. WL/3P
4. WL/4P

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70. If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight w per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

1. h = (W/Aw) [(1 - sinφ)/(1 + sin φ)]
2. h = (W/Aw) [(1 + sinφ)/(1 + sin φ)]
3. h = (W/Aw) [(1 - sinφ)/(1 + sin φ)]²
4. h = √(W/Aw) [(1 - sinφ)/(1 + sin φ)]²

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