$5*1$mark $=5$ marks

$($i$)$ For anisotropic materials, the application of an extensional load generates: $($CO $1)$

$($a$)$ Only extensional strain. $($b$)$ only shear strain $($c$)$ both shear & extensional $($d$)$ none

$($ii$)$ The correct relationship between engineering strain $(Y)$ and tensor strain$($e$)($CO$1)$

$($a$)Y=e$

$($b$)y=0\mathrm{.}5e$

$($c$)y=2e$

$($d$)y=0\mathrm{.}25e$

$($iii$)$ The number of independent elastic constants for an orthotropic material, given that stress is considered symmetric are

$($iv$)$ Mechanical properties of fiber$-$reinforced composites depend on

$($CO$1)$

$($a$)$ Properties of constituents $($b$)$ Interface strength $($c$)$ fiber length, orientation, and volume fraction $($d$)$ All of the above

$($v$)$ Longitudinal elastic modulus is E$1q,$ dominated. $q,$ dominated and transverse elastic modulus E$2$ is

$($a$)$ Matrix, fiber

$($b$)$ Fiber, Matrix

$($c$)$ Matrix, Matrix

$($d$)$ Fiber, Fiber

$t-2$

$3**5$ marks $=15$ marks