Q. 21 If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is
A. 12 mm
B. 10 mm
C. 12 mm
D. 16 mm
B. Fat lime
Q. 22Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
A. Twice the diameter of thinner bar
B. One diameter of thinner bar
C. One diameter of thicker bar
D. None of these
C. One diameter of thicker bar
Q. 23 For a number of columns constructed in a rcjw, the type of foundation provided, is
A. Strip
C. Raft
B. Footing
D. Strap
A. Strip
Q. 24 A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, isq
A. 25 cm
B. 30 cm
C. 20 cm
D. 35 cm
B. 30 cm
Q. 25 In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed
A. 25 mm
B. 10 mm
C. 15 mm
D. 20 mm
A. 25 mm
Q. 26 The diameter of main bars in R.C.C. columns, shall not be less than
A. 12 mm
B. 8 mm
C. 6 mm
D. 10 mm
A. 12 mm
Q. 27 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. 176 cm
B. 300 cm
C. 233 cm
D. 236 cm
A. 176 cm
Q. 28 The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than
A. 30 bar diameters
B. 18 bar diameters
C. 24 bar diameters
D. 36 bar diameters
A. 30 bar diameters
Q. 29 As the percentage of steel increases
A. Lever arm increases
B. Depth of neutral axis decreases
C. Depth of neutral axis increases
D. Lever arm decreases
C. Depth of neutral axis increases
Q. 30 The effective width of a column strip of a flat slab, is
A. Radius of the column
B. One-fourth the width of the panel
C. Half the width of the panel
D. Diameter of the column
C. Half the width of the panel
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