GATE Mechanical Engineering (ME) 2019 Shift 2 Solved Paper

Formula for endurance limit
${\mathit{\sigma }}_{\mathit{e}}={\mathit{K}}_{\mathit{a}}\times {\mathit{K}}_{\mathit{b}}\times {\mathit{K}}_{\mathit{c}}\times {\mathit{K}}_{\mathit{d}}\times {\mathit{\sigma }}_{\mathit{e}}^{\prime }$
Where
${\mathit{K}}_{\mathit{a}}-$ Size factor
${\mathit{K}}_{\mathit{b}}-$ Surface factor
${\mathit{K}}_{\mathit{c}}$ - load factor
${\mathit{K}}_{\mathit{d}}-$ Temperature factor
${\mathit{\sigma }}_{\mathit{e}}^{\prime }-$ Endurance Strength
Form above formula it is clear that the Endurance limit increases with increase in size, surface, load, temp and endurance strength.