1. In stage2, why do the 4 curves become relatively flat? Select the true statem

Question

1. In stage2, why do the 4 curves become relatively flat? Select the true statement (only one).

a) the turbo pump is slowing down, and it is caused by the fact that pressure is going from viscous to the molecular flow regime.

b) The pump is slowing down and it is caused by the lowering of pressure. The lower the pressure, the less dense the gas, the fewer molecules the pump can scoop out each cycle.

c) In this stage, the pump throughput is the same as gas load. Thus the rates of molecules being added to the chamber and removed from the chamber cancel each other out. Thus pressure drop rate decreases almost to zero.

d) The pump is much slower because it is now pumping on lighter molecules such as He or H2.

e)   The pump is close to its mechanical limit. Thus it is slowing down.

Entire curve 4.00E+00 3.00E+00 2.00E+00 1.00E+ agel Time(sec) 350 Sho 0.00E-00 a -1.00E+00 82.00E+00 3.00E+00 4.00E+00 Long Vent Short Vent Dry Towel X Wet Towel 0 100 150 200 250 300 Stage2 -5.00E+00 6.00E+00

Explanation / Answer

1. In stage2, why do the 4 curves become relatively flat? Select the true statem

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