Question

What will be the torque required to drive a 0.1 litre/min pump at 2000 rpm of delta pressure across pump is 240 bars?

(a) 0.87 Nm

(b) 0.992 Nm

(c) 0.191 Nm

(d) 0.367 Nm

This question was posed to me in homework.

My query is from Numericals on Estimation of Tractor Power topic in section Tillage, Disc Plough & Numericals of Farm Machinery

Answer 1

The correct option is (c) 0.191 Nm

Best explanation: Ph = Qπ

= \(\frac{0.1*10^{-3}}{60}\)*240*10^6 = 40 W = 0.040 Kw

P = \(\frac{2πNT}{60000}\)

T = \(\frac{0.040*60000}{2π*2000}\) = 0.191 KW.