A horizontal screw conveyer of $2.4 \mathrm{~m}$ length conveys wheat grain of bulk density $680 \mathrm{~kg} \mathrm{~m}^{-3}$ and materials factor 1.2 . The screw diameter, shaft diameter and pitch of the screw are 0.5,0.15 and 0.4 $\mathrm{m}$, respectively. If the screw is completely filled with grains and rotates at $60 \mathrm{rpm}$, the capacity of the screw conveyer in $\mathrm{m}^{3} \mathrm{~h}^{-1}$ and the actual power required in hp (approximately) are respectively.

(A) 257,2.8

(B) 258,2.5

(C) 275,1.9

(D) 396,2.9

A horizontal screw conveyer of $2.4 \mathrm{~m}$ length conveys wheat grain of bulk density $680 \mathrm{~kg} \mathrm{~m}^{-3}$ and materials factor 1.2 . The screw diameter, shaft diameter and pitch of the screw are 0.5,0.15 and 0.4 $\mathrm{m}$, respectively. If the screw is completely filled with grains and rotates at $60 \mathrm{rpm}$, the capacity of the screw conveyer in $\mathrm{m}^{3} \mathrm{~h}^{-1}$ and the actual power required in hp (approximately) are respectively.

(A) 257,2.8

(B) 258,2.5

(C) 275,1.9

(D) 396,2.9

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