01 If two of the three elastic constants are given then one

01.) If two of the three elastic constants are given, then one can find the third one. False True 02.) Hooke\'s 1-D equation for linear elastic deformation is: modulus of elasticity = (normal engineering stress) / (normal engineering strain). False True 03.) Creep rate is a function of applied stress and temperature. True False 04.) Dislocations move on planes with max. PD and along directions of max. LD. False True Q5.) The energy associated with a Lis directly related to square of its Burgers vector (b). False True 06) The length or magnitude of a slip in a deforming crystal is equal to the magnitude of the dislocation\'s b. False True 07.) Cold working means plastic deformation at a temperature below the recrystallization temperature of the metal/alloy. False True 08.) To increase the yield strength of a metal (at room temperature) we need to decrease its grain size. False True 09.) To increase the creep rate of a metal (at elevated temperature) we need to increase its grain size. False True 010.) shear modus (G)- (Young\'s modulus)/2(1 + Poisson\'s ratio). False True 011.) Fatigue life of a metal/alloy depends on the mean stress acting on it. False True

Solution

1. TRUE (BUT POISSONS RATIO MUST BE GIVEN)

2. TRUE

3.FALSE

4.FALSE

5.TRUE

6.FALSE

7.TRUE

8.TRUE

9.FALSE

10.TRUE

11.TRUE

12.TRUE

13.FALSE

14.TRUE

15.TRUE