Two pumps are connected in parallel, if Q1 is the discharge of pump 1 and Q2 is the discharge of pump 2, where Q2 > Q1, what is the discharge? A. Q1 B. Q1 + Q2  c. Q2 D. Q1-Q2 2. If Hi is the indicated horsepower and HB is the indicated brake horsepower of a compressor, then what is mechanical eficiency, Em, equal to? A. Em = HB/Hi B. Em = Hi/HB C. Em = HB - Hi D. Em = Hi -HB

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The figure below shows a liquid-level system in which two tanks have cross-sectional areas, A₁ and A2, respec- tively. A pump is connected to tank 1 through a valve of linear resistance R₁. The inlet to the atmosphere, and the pressure of the fluid increases by Ap when crossing the pump. The liquid flows from tank 1 to pump is tank 2 through a valve of linear resistance R₂ and leaves tank 2 through a valve of linear resistance R3, exiting at at- mospheric pressure. Assume the density p of the liquid is constant and note that both tanks are open to atmosphere as shown. open to Pa Ap Your Tasks: R₁ Pa 0 kl nd A₁ R₂ Pa I kl Az R3 *C- → 90 A. Derive a differential equation model for the system behavior in terms of the liquid heights h₁ and h₂. B. Put the differential equations into second-order matrix form.

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