Fuel cells generate electricity at efficiencies of 40 percent and ____ with cogeneration systems that use the excess heat.
a. 50 percent
b. 65 percent
c. 80 percent
d. 95 percent
c. 80 percent
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How many body systems are found in animals?
A. nine B. ten C. eleven D. fifteen
A compound has TC = 500 K, PC = 5 MPa and ? = 0.4. The compound is known to have Psat = 2 kPa and ?Hvap = 30 kJ/mol at T = 250 K. No other data is available. Which of the following is the most accurate way to estimate the boiling point at a pressure of 1.5 kPa?
A. The Clausius-Clapeyron equation B. The shortcut equation C. The Antoine equation D. The van der Waals equation of state E. All of these are possible but none will provide an estimate accurate enough to be useful.
Whenever an engine is disassembled, the piston rings are replaced.
Answer the following statement true (T) or false (F)
Solve the proportion for the missing number (x): 1:3.5= 14:x.
What will be an ideal response?