Most Important Interview Questions for Civil Engineers ~ Civil Engineer Knowledge

INTERVIEW QUESTION-PART 3

1. What is the field test of Cement?

DATE OF PACKING- The strength of the cement reduce due to age. So, the date of manufacturing of cement bag should be checked.

RUBBING TEST- When cement is touched or rubbed in between fingers, it should give a smooth feeling. If it felt rough, it indicates adulteration with sand.

PRESENCE OF LUMPS- The cement should be free from any hard lumps.

FLOAT TEST- If a small quantity of cement is thrown in a bucket of water, the particles should float for some time before it sinks.

COLOUR TEST- The colour of cement should be uniform grey colour with a light greenish shade.

TEMPERATURE TEST- If hand is inserted in a bag of cement ,it should feel cool.

2. What is the field test of sand?

Take a jar of water and add some quantity of sand in it. Then shake it continuously and allow it to settle. If clay is present in sand, it will form a distinct layer at the top of sand.

If we add sand to the solution of sodium hydroxide or caustic soda and then stir it. If colour of solution changes to brown, it indicates the presence of organic impurities.

The colour of sand will indicate the purity of sand. The size and sharpness of grains may be examined by touching and observing visually.

Take a little quantity of sand and taste it. If tasted salty then there exist some salt in sand.

Take some quantity of sand and rub it against the fingers. If fingers are stained, it indicates that sand contains earthy matter.

3. What is the unit weight of sand and aggregate?

SAND = 1500-1650 Kg/m3
AGGREGATE = 1500-1550 Kg/m3

4. What is the clear cover for Footings, Beam, column, Slab?

FOOTINGS = 50 mm.
BEAM = 25 mm.
COLUMN = 40 mm.
SLAB = 15 mm.

5. What is Ductility?

The ability to deform under tensile stress is called Ductility.

6. What is height of each floor?

3 Meter ( floor to floor)

7. What is the crack length of slab?

The crack length of slab is 0.42D
Where D = (Depth of the slab- top cover - bottom cover)

To continue to next parts of "Most Important Interview Questions for Civil Engineers" CLICK HERE- Part 1,Part 2, Part 4, Part 5, Part 6.
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Most Important Interview Questions for Civil Engineers