Question 1

A pre-stressed concrete member

Accepted Answer

A)  Is made of concrete
B)  Is made of reinforced concrete
C)  Is stressed after casting
D)  Possesses internal stresses D

Question 2

To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than

Accepted Answer

A)  b/3
B)  b/4
C)  b/5
D)  b/6 D

Question 3

Design of R.C.C. cantilever beams, is based on the resultant force at

Accepted Answer

A)  Fixed end
B)  Free end
C)  Mid span
D)  Mid span and fixed support A

Question 4

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

Accepted Answer

A)  2R + T =60
B)  R + 2T = 60
C)  2R + T = 30
D)  R + 2T = 30

Question 5

An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm placed symmetrically along the circumference. If it carries a load of 40, 000 kg axially, the stress is

Accepted Answer

A)  49.9 kg/cm2
B)  100 kg/cm2
C)  250 kg/cm2
D)  175 kg/cm2

Question 6

On piles, the drop must be at least

Accepted Answer

A)  80 cm
B)  100 cm
C)  120 cm
D)  140 cm

Question 7

Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as

Accepted Answer

A)  1/8th of the span
B)  1/10th of the span
C)  1/12th of the span
D)  1/16th of the span

Question 8

In a combined footing if shear stress does not exceed 5 kg/cm2 , the nominal stirrups provided are

Accepted Answer

A)  6 legged
B)  8 legged
C)  10 legged
D)  12 legged

Question 9

The shear reinforcement in R.C.C. is provided to resist

Accepted Answer

A)  Vertical shear
B)  Horizontal shear
C)  Diagonal compression
D)  Diagonal tension

Question 10

The minimum cube strength of concrete used for a pre-stressed member, is

Accepted Answer

A)  50 kg/cm2
B)  150 kg/cm2
C)  250 kg/cm2
D)  350 kg/cm2

Question 11

A circular slab subjected to external loading, deflects to form a

Accepted Answer

A)  Semi-hemisphere
B)  Ellipsoid
C)  Paraboloid
D)  None of these

Question 12

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

Accepted Answer

A)  wl²/4
B)  wl²/8
C)  wl²/12
D)  wl²/16

Question 13

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

Accepted Answer

A)  WL/P
B)  WL/2P
C)  WL/3P
D)  WL/4P

Question 14

The maximum shear stress (q) in concrete of a reinforced cement concrete beam is

Accepted Answer

A)  Shearforce/(Lever arm×Width) 
B)  Lever arm/(Shearforce ×Width) 
C)  Width/(Lever arm × Shearforce) 
D)  (Shearforce × Width) /Lever arm

Question 15

The thickness of base slab of a retaining wall generally provided, is

Accepted Answer

A)  One half of the width of the stem at thebottom
B)  One-third of the width of the stem at the bottom
C)  One fourth of the width ofthe steam at the bottom
D)  Width of the stem at the bottom

Question 16

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

Accepted Answer

A)  30°
B)  40°
C)  45°
D)  All the above

Question 17

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

Accepted Answer

A)  5 cm
B)  10 cm
C)  15 cm
D)  20 cm

Question 18

If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is

Accepted Answer

A)  d
B)  n
C)  d + n/3
D)  d - n/3

Question 19

A flat slab is supported

Accepted Answer

A)  On beams
B)  On columns
C)  On beams and columns
D)  On columns monolithically built with slab

Question 20

In a pre-stressed beam carrying an external load W with a bent tendon is having angle of inclination ? and pre-stressed load P. The net downward load at the centre is

Accepted Answer

A)   W - 2P cos?
B)   W - P cos?
C)   W - P sin?
D)   W - 2P sin?

Exam 6: Concrete Design and Structural Analysis