A roller chain sprocket with a hub on both sides is a/an _____ type sprocket
A. "A" type.
B. "B" type.
C. "C" type.
D. "D" type.
C
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Which is most like electric current?
A. Restriction B. Pressure C. Flow rate D. Temperature
What type of body protection protects against sparks?
A) Aprons B) Arc flash suits C) Reflective clothing D) Flame-resistant clothing
A supercritical fluid Xis used as a solvent. The critical point is T=500 K and P=200 bar, so the process must be carried out at exceedingly high temperatures and pressures. At the end of the process a turbine is used to return the supercritical fluid to lower pressures. It enters the turbine at T=550 K and P=300 bar and leaves the turbine at T=300 K and P=1 bar.
This equation of state can be used to model the supercritical fluid at the conditions we are examining in this problem: Z = 1 + bPT Where b= 1.5 x 10-6 bar-1K-1 The ideal gas heat capacity is Cp*=5R, and can be considered constant, and the acentric factor is ?=0.4. A) Estimate the change in molar enthalpy the compound X experiences when it goes through the turbine, using the equation of state above. B) If you were going to use the Peng Robinson equation to model X at T=550 K, what values of the parameters a and b would you use? C) Another solvent Y is geometrically and structurally similar to X. Y has critical temperature of 425 K and critical pressure of 150 bar, and no other data for Y is available. What is your best estimate of the constant b for compound Y in the equation of state Z = 1 + bPT?
When the rotor is removed from the rear housing the brushes will fall out
A) True B) False