The D-ring or support point on a safety harness should be placed _____
A) between the shoulder blades
B) at the back of the neck
C) around the waist
D) over the rib cage
Answer: A
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Given the graph below, the marginal rate of technical substitution over the range AB is equal to ________ while the marginal rate of technical substitution over range BD is equal to ________.
Compound X enters a steady state compressor as a gas at P1=0.5 bar and T1=300 K, and leaves the compressor at P2=15 bar and T2=600 K. (These are the actual temperature and pressure of the exiting stream.) Then it enters a steady state heat exchanger in which it is cooled and condensed into a liquid at P3=15 bar and T3=200 K.
X has the following properties: Critical temperature T=250 K Critical pressure P=40 bar Acentric factor ?=0.2 Ideal gas heat capacity CP* = 5R At temperatures equal to or below 250 K, it can be modeled using the Peng-Robinson EOS At pressures below 1 bar, it can be modeled as an ideal gas At the conditions of the compressor outlet (2), it can be modeled using the following EOS: PV = RT + (BP3) Where B = -4 cm3mol-1bar-2 Prove that ((??H)/?P)_T= ?V- T((??V)/?T)_P Find a general algebraic expression for the residual molar enthalpy HR, in terms of P, V , T and/or constants, that results from the equation of state PV = RT + (BP3). Find the change in molar enthalpy for the gas as it goes through the compressor (H2-H1). Determine the Peng-Robinson parameters a and b for this compound at a temperature of 200 K. The three solutions of the Peng-Robinson for V at T=200 K and P=15 bar are V = 60.2, 326.3 and 681.6 cm3/mol. Determine the compressibility factor Z for the liquid leaving the heat exchanger. Suppose you wanted to use the Lee-Kesler method, rather than the Peng-Robinson equation, to model the liquid leaving the heat exchanger (T3, P3). Use the figures in Chapter 7 to estimate the residual molar entropy S3R of this liquid. Y is another compound in the same chemical family as X. Y has a critical temperature of 300 K and a critical pressure of 30 bar. At what temperature and pressure would you expect compound Y to have a compressibility factor (Z) identical to the one you calculated in part E?
Which of the following terms is used to describe an engine with lower cylinder turbulence?
A. high horsepower B. quiescent C. passive D. high swirl
What is the annual operating cost for a solar water heating system with an SEF (solar energy factor of 2.1? (12.03 = a constant for the average kWh/day of electricity used in electric water heaters and 12ยข = 2014 national average cost of electricity in kWh)
A) $250.91 B) $225.19 C) $278.73 D) $234.66