civil engineering interview questions and answer

1. POSSIBLE INTERVIEW
QUESTION

2.  Senior engineer / project manager
 Site engineer
 Contractor
 Mistri
 Mason / labour
Authorities on a construction site

3.  Compressive strength of bricks:
 First class brick -105 kg/cm2
 Second class brick – 70 kg/ cm2
 Fire brick – 125 kg/cm2
 Water absorption bricks – 16 % to 20 %.
 Weight of brick 3.5 to 5 kg.
 Standard brick size – 190 x 90 x 90 mm
BRICKS

4. Volume (L x W x H) = 1 meter cube.
 Mortar thickness = 8 mm.
 Mortar Ratio = 1:4
 Size of brick = 190 mm ×90 mm ×90 mm. or (0.19 m x 0.09 m x 0.09 m).
 Size of brick with mortar = 198 mm × 98 mm× 98 mm. or (0.198 m x 0.098
m x 0.098 m).
 BRICKS = 526
 CEMENT = 1.5 bags.
 SAND = 7.1 cubic feet.
 Note: These ratios may change by changing the dimension of the mortar
thickness or size of the bricks as well as the mortar ratios 1: 4, 1: 6 etc.
BRICKS

5. 4.5 inch wall thickness = 531 bricks
9 inch wall thickness = 1062 bricks
13.3 inch wall thickness = 1593 bricks

6.  Slope – 25 to 40 as per IS 456-2000.
 No.of.steps : 15 steps max.
tread – 300mm, rise -150 mm
 Volume of cement bag - 0.0347 m3 = 50/1440
 volume(eg: 1:1.5:3 = 5.5 = 1/5.5 *1.57 = 0.285 m3
 standard sand now used in India is obtained from – Ennore
(chennai).
Stair case

7. Concrete details:
 Workability –slump cone test
 Hardened concrete test – compressive test
 M20 – M- mix, 20 char. compressive strength of concrete in
28 days i.e., 20N/mm2
 Unit weight of concrete
 PCC- 24 kN/m3
 RCC – 25 kN/m3
 Minimum Grade of concrete used for RCC – M20.

8.  Unit weight of steel – 78.5 kN/m3
 Minimum reinforcement for circular : 6 no’s
 Minimum reinforcement for Square : 4 no’s
 Calculation of weight of steel bar- D2/162
 Function of stirrups in beam – resist SF.
Steel

9. Types :
 OPC -33,43,53
 PPC - 43
Setting time:
 Initial settling time of cement – 30 min(OPC)
 Final setting time -10 hrs (OPC)
 Initial settling time of cement – 10 min(PPC)
 Final setting time – 90 min (PPC)
cement

10.  Load bearing
 Framed structure
Types of building

11.  Pile foundation – SBC less than 24 kN/m3
 Standard height of each floor – 3 m
 Multi storey – 15 m
 Full form of 1 BHK – BED ROOM , HALL , KITCHEN.
 Thickness of plaster – 12 mm
 Mortar b/w the bricks 12 mm
 Slab thickness -150 to 200 mm

12.  Door size – 3.75 ft *7 ft
 Window size – 3,5 ft * 3.5 ft
 Ventilation normal – 2 ft * 2 ft
 Sill level – 3 ft
 Lintel level – 7 ft
 Roof level – 10 ft to 11 ft (residential building)
 Parapet wall – 3m high above the roof.

13.  Shuttering removal timing:
 Side of wall, column and outer side of beam – 24hrs to
48 hrs.
 Beam soffits – 7 days
Shuttering

14.  Maximum spacing b/w the bars in beam – 25 mm.
Least cover
 Footing – 50 mm
 Column – 40mm
 Beam – 25 mm
 Slab – 20 mm
cover

15.  Vertical member
 Support structural load
 Finally to the ground through footings.
 M 10 – 1:3:6
 M15 – 1:2:4 NOMINAL MIX
 M20 – 1:1.5:3
 M25 – 1:1:2
column

16.  TMT BARS – THERMO MECHANICALLY TREATED
BARS.
 High Strength And High Corrosion Resistance.
FIELD TEST OF CEMENT:
 Colour
 Feel Smooth When Rubbish With Hands

17. SHALLOW
SPRED
COMBINED
STRAP
MAT OR RAFT
DEEP
 PILE
 PIER
FOUNDATION

20.  Concrete: 2370 kg/m^3
 Cement: 1440 kg/m^3
 Cement Mortar: 2080 kg/m^3
 Brick: 1600-1920 kg/m^3
 Brick Masonry: 1920 kg/m^3
 Dry Sand: 1600 kg/m^3
 River Sand: 1840 kg/m^3
 PCC: 2240 kg/m^3
 Steel: 7849 kg/m^3
 Cast Iron: 7208 kg/m^3
 RCC 2% Steel: 2420 kg/m^3
 Aluminium: 2739 kg/m^3

21.  Gravel with sand: 1920 kg/m^3
 Crushed Stone: 1600 kg/m^3
 4 inch Brick w/½" mortar: 673 kg/m^3
 8 inch Concrete Block w/½" mortar: 881 kg/m^3
 12 inch Concrete Block w/½" mortar: 1281 kg/m^3
 A. C. Sheet Corrugated: 16 kg/m^3

22.  Teak Wood: 670–830 kg/m^3
 1/4 inch Plywood: 3.47 kg/m^3
 3/8 inch Plywood: 5.18 kg/m^3
 1/2 inch Plywood: 6.93 kg/m^3
 1/2 inch Gypsum: 7.62 kg/m^3
 3/8 inch Gypsum: 10.2 kg/m^3
 Marble: 2560 kg/m^3
 Limestone: 2739 kg/m^3
 Granite Stone: 2460–2800 kg/m^3
 Tar:1150 kg/m^3
 Porcelain: 2400 kg/m^3
 Window Glass: 2580 kg/m^3