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Homework Help: Thermodynamics oil pump efficiency question

  1. Aug 1, 2006 #1
    Hi guys, could someone help me on this? I'm stuck :(

    *A motor draws 35kW electricity, it operates at 90% efficiency. The motor is connected to an oil pump which has an inlet diameter of 8cm & an outlet diameter of 12cm. pressure rise in the oil pump is 400kPa. oil enters the pump at 0.1m^3/s. what is the mechanical efficiency of the oil pump?*

    I understand the question, I know the mechanical input power is 31.5kW and that i need to figure out the output power from the info given, then the mech efficiency is that number/31.5kW ... but I've got no clue how to go about finding the output power. sooo.... could I get some pointers pretty please? any help would be greatly appreciated.
  2. jcsd
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