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GATE 2021 AG – Question 26

Farm Machinery · Machine Design · 1 mark · Numerical answer

A gear pump displaces120 cm³/rev at 1500 rpm against18 MPa. Torque efficiency90%. Find actual driving torque in N m, to two decimals. Use π=3.14.

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Correct answer: 380.00 to 383.00

Explanation

Theoretical torque is $\Delta pV_d/(2\pi)=18\times10^6(120\times10^{-6})/6.28=343.949$ N m. Actual input torque=theoretical/.90=**382.17 N m**. Speed cancels when torque is calculated from displacement per revolution.

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