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Oral Questions

Test 1

Tension test

1. Why is breaking stress found less than ultimate stress?2. Draw a sketch of specimen after failure and show cap cone arrangement?3. Why % elongation is to be calculated?4. What is the grade of steel for the sample you have tested?5. What will be the effect of increase of carbon content on ultimate strength and % elongation

values of the specimen?

6. Which is another way to measure ductility?7. Weather the stress strain curve for aluminium and copper will be the same as that of mild

steel?

8. Can you calculate poissons ratio by conducting tension test?9. What is proof stress? Why the concept of proof stress is introduced for deformed steel bars?10.Refer stress strain behaviour of mild steel bar and deformed steel bar under tension and

compare its behaviour?

11.What do you mean by twisted bars?12.State difference between rerolled and brittle steel?13.What is the effect on tensile strength if loading rate increases or decreases than specifided

in IS?

14.Why proof stress is calculated at 0.2 residual strain?Impact test

1. Metal breaks or bends after impact test. What conclusion do you draw from this?2. Compare toughness of different metals from strain energy absorbed?3. Why notch is provided to the specimen?4. Why notch is provided on opposite to the striking edge of hammer in case of charpy test?5. In izod impact test why notch is provided on facing edge?6. Compare izod and charpy impact test?7. If aluminium specimen breaks in charpy test can you testify its brittle material?8. Energy absorbed by material A is less than B when tested in charpy test comment on

toughness of metal?9. State any three civil engineering structures where impact test plays vital role in assessing its

strength?

10.Does toughness depends on carbon content in the metal? Why?Absorption test

1. What is the significance of tile abrasion test?2. Draw sketch of set-up of thickness measuring apparatus used for tile specimen3. Tile having water absorption 17% & 23% are tested in abrasion. Which tile will give more

abrasion resistance?

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4. Will the abrasion resistance of tile depends on compressive strength of concrete used formanufacturing of tile?

5. In which of the following situations you will assess critically abrasive resistance of material?Why?

a. Interlocking concrete blocks used for roadsb. Interlocking concrete blocks used as retaining wall in bridgec. Industrial floord. Floors in residential buildinge. Prestressed sleepers below rails

6. Will the abrasion resistance of tiles depends on density of its materials? Justify.7. Will you use same test to calaulate abrasion resistance to stone flooring? If not explain the

method to calculate abrasion resistance?

8. Which of the following stone flooring have more abrasion resistance?a. Shahabad flooringb. Marble flooringc. Granite flooring