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Civil Engineering Objective Questions { RCC Structure Design }

43. A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
A. remains within the flange
B. remains below the slab
C. coincides the geometrical centre of the beam
D. none of these.

44. If the neutral axis of a T-beam is below the slab, the relationship between the flange width B, depth of neutral axis n, thickness of the slab ds, effective depth of the beam d, gross area of tensile steel At and the modular ratio m may be stated as
A. Bds n - -2- = mAt(d + n)
B. Bds n+-- = mAt(d - n)
C. Bds ( n - ?ds = mAt(d - n) 2
D. Bds(n - ds) = mAt(d - n)

45. An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is
A. 300 cm
B. 233 cm
C. 176 cm
D. 236 cm

46.  Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
A. two times
B. three times
C. four times
D. five times

47. As per IS : 456, the reinforcement in a column should not be less than
A. 0.5% and not more than 5% of cross-sectional area
B. 0.6% and not more than 6% of cross-sectional area
C. 0.7% and not more than 7% of cross-sectional area
D. 0.8% and not more than 8% of cross-sectional area

48.  The diameter of longitudinal bars of a column should never be less than
A. 6 mm
B. 8 mm
C. 10 ham
D. 12 mm

49. The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than
A. 4 mm
B. 5 mm
C. 6 mm
D. 7 mm

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