1. Qualify each statement as ‘True’ or ‘False’ Some sort of explanation for each

Question

1. Qualify each statement as ‘True’ or ‘False’ Some sort of explanation for each is required.

1- Fatigue testing is a type of static mechanical test method.           True    False

2- Vickers hardness test is always used as a microhardness test technique.    True   False

3- With increasing temperature, the thermal creep rate decreases.    True   False

4- Due to the Hall-Petch strengthening effect, a coarse grained material can exhibit higher yield strength compared to a fine grained material.      True     False

5- Uranium has six allotropic forms.     True   False

6- Uranium has a melting point that surpasses the melting point of UO2.    True False

7- Irradiation creep at lower homologous temperature is not possible.    True   False

8- Void swelling is a direct result of the formation of dislocation loops.    True   False

9- Sensitization creates intragranular failure in some high-chromium austenitic stainless steels.   True   False

10- The void swelling occurs mainly in the temperature range of 0.1-0.2Tm where Tm is the melting temperature of material in K.        True   False

Explanation / Answer

1. True : The fatigue testing is static mechanical test method

2. True: used for thin cross sections,small parts and the indention it makes is small

3. False : Thermal creep rate increases with temperature

4. False : As we reduce the grin size the yield strength is increased due to Hall - petch strengthening effect

fine grained structure has lesser grain size than coarze grained. Hence the yield strength is higher for fine grained structures as compared to coarse grained.

5. False : Uranium has 3 allotropic forms

6.False : melting point of uranium ( 1132 deg C ) < melting point of Uo2 ( 2865 deg C)

7. False :Irradiation creep is possible at low homologus temperature. This is known as radiation induced creep where therma creep is negligible.

8. True: Void swelling is a direct result of the formation of dislocation loops

9. False: Sensitization creates intergranular failure in some high-chromium austenitic stainless steels ( Not intraganular)

10: True : The void swelling occurs mainly in the temperature range of (0.1-to 0.2 )Tm where Tm is the melting temperature of material in K.

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