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If L represents torque, and the subscripts T, o, f, b denotes the turbopump, oxidizer pump, fuel pump and bearings respectively, then which of the following expressions is true when there are no gears in a particular turbopump?

If L represents torque, and the subscripts T, o, f, b denotes the turbopump, oxidizer pump, fuel pump and bearings respectively, then which of the following expressions is true when there are no gears in a particular turbopump? Correct Answer LT = Lo + Lf + Lb

The torque of the turbopump will then be the sum of all the other torques. This is evident from the expression, PT = LTNT = LoNo + LfNf + Pb. When there are no gears, all the N terms will be equal and the expression simplifies to LT = Lo + Lf + Lb.

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