# Practice Test: Question Set - 15

**1. [**

*A*+ (*m*- 1)*A*] known as equivalent concrete area of R.C.C. is given by_{SC}- (A) Modular
ratio method

- (B) Load
factor method

- (C) Ultimate
load method

- (D) None of
these

**2. A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm**

^{2}, the area of steel required, is- (A) 14 cm

^{2}

- (B) 15 cm

^{2}

- (C) 16 cm

^{2}

- (D) 17 cm

^{2}

**3. The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is**

- (A) 30°

- (B) 40°

- (C) 45°

- (D) All
the above

**4. If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be**

- (A) 5
cm

- (B) 10 cm

- (C) 15
cm

- (D) 20 cm

**5. If permissible working stresses in steel and concrete are respectively 1400 kg/cm**

^{2}and 80 kg/cm^{2}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- (A) 37
cm

- (B) 38 cm

- (C) 39 cm

- (D) 40 cm

**6. The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm**

^{2}, safe shear stress 5 kg/cm^{2}and B.M. 24 mt,- (A) Is
safe in shear

- (B) Is unsafe in
shear

- (C) Is
over safe in shear

- (D) Needs
redesigning

**7. 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- (A)

*WL*/

*P*

- (B)

*WL*/2

*P*

- (C)

*WL*/3

*P*

- (D)

*WL*/4

*P*

**8. If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is**

- (A) 40

- (B) 45

- (C) 50

- (D) 55

**9. If**

*W*is total load per unit area on a panel,*D*is the diameter of the column head,*L*is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than- (A)

*WL*/12 (

*L*- 2

*D*/3)²

- (B)

*WL*/10 (

*L*+ 2

*D*/3)²

- (C)

*WL*/10 (

*L*- 2

*D*/3)²

- (D)

*WL*/12 (

*L*-

*D*/3)²

**10. Piles are usually driven by**

- (A) Diesel
operated hammer

- (B) Drop
hammer

- (C) Single
acting steam hammer

- (D) All
the above

**11. A circular slab subjected to external loading, deflects to form a**

- (A) Semi-hemisphere

- (B) Ellipsoid

- (C) Paraboloid

- (D) None
of these

**12. In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at**

- (A) Less
loaded column

- (B) More loaded
column

- (C) A
point of the maximum shear force

- (D) A point of
zero shear force

**13. If the average bending stress is 6 kg/cm**

^{2}for M 150 grade concrete, the length of embedment of a bar of diameter*d*according to I.S. 456 specifications, is- (A) 28

*d*

- (B) 38

*d*

- (C) 48

*d*

- (D) 58

*d*

**14. The live load to be considered for an inaccessible roof, is**

- (A) Nil

- (B) 75 kg/m

^{2}

- (C) 150 kg/cm

^{2}

- (D) 200 kg/m

^{2}

**15. A pile of length ‘**

*L’*carrying a uniformly distributed load ‘*W’*per metre length is suspended at the centre and from other two points 0.15*L*from either end ; the maximum hogging moment will be- (A)

*WL*²/15

- (B)

*WL*²/30

- (C)

*WL*²/60

- (D)

*WL*²/90

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