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Steam $\left(\mathrm{h}_{\mathrm{f}}=632.2, \mathrm{~h}_{\mathrm{fg}}=2113.2, \mathrm{~h}_{\mathrm{g}}=2745.4 \mathrm{~kJ} \mathrm{~kg}^{-1}\right)$ at $150^{\circ} \mathrm{C}$ is used to sterilize milk by direct steam injection. Milk is initially at $90^{\circ} \mathrm{C}$ and after sterilization, the blend of resultant milk and condensed steam $\left(\mathrm{h}_{\mathrm{f}}=567.6, \mathrm{~h}_{\mathrm{fg}}=2159.2, \mathrm{~h}_{\mathrm{g}}=2726.7  \mathrm{~kJ} \mathrm{~kg}^{-1}\right)$ are at $135^{\circ} \mathrm{C}$. Specific heat capacity of milk is $3.8 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$. Assuming no energy loss, the amount of milk (in $\mathrm{kg}$ ) sterilized per $\mathrm{kg}$ steam supplied is
(A) 21.57
(B) 12.74
(C) 9.73
(D) 4.48



Question ID - 156774 | SaraNextGen Top Answer

Steam $\left(\mathrm{h}_{\mathrm{f}}=632.2, \mathrm{~h}_{\mathrm{fg}}=2113.2, \mathrm{~h}_{\mathrm{g}}=2745.4 \mathrm{~kJ} \mathrm{~kg}^{-1}\right)$ at $150^{\circ} \mathrm{C}$ is used to sterilize milk by direct steam injection. Milk is initially at $90^{\circ} \mathrm{C}$ and after sterilization, the blend of resultant milk and condensed steam $\left(\mathrm{h}_{\mathrm{f}}=567.6, \mathrm{~h}_{\mathrm{fg}}=2159.2, \mathrm{~h}_{\mathrm{g}}=2726.7  \mathrm{~kJ} \mathrm{~kg}^{-1}\right)$ are at $135^{\circ} \mathrm{C}$. Specific heat capacity of milk is $3.8 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$. Assuming no energy loss, the amount of milk (in $\mathrm{kg}$ ) sterilized per $\mathrm{kg}$ steam supplied is
(A) 21.57
(B) 12.74
(C) 9.73
(D) 4.48

1 Answer
127 votes
Answer Key / Explanation : (B) -

(B) 12.74

127 votes


127