Which of the following statements about fuel cells is NOT true?
A. A single fuel cell produces very low voltage, normally less than 1 volt.
B. A fuel cell produces electricity through an electrochemical reaction that combines hydrogen and oxygen to form water.
C. A fuel cell is composed of two electrodes coated with a catalyst and separated from each other by an electrolyte and from the case by separators.
D. In a fuel cell, catalysts are used to ignite the hydrogen; this causes a release of electrons or electrical energy.
D. In a fuel cell, catalysts are used to ignite the hydrogen; this causes a release of electrons or electrical energy.
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When diesel fuel is combusted in an engine cylinder, which of the following is produced in the greatest quantity by mass (weight)?
A. carbon dioxide B. water vapor C. hydrocarbons D. particulate matter
Determine the pressure of the system and the equilibrium constant for the reaction.
A reaction A+B?C+D occurs in the liquid phase at 298.15 K. A vapor phase is also present, but no reaction occurs in the vapor phase. The liquid is an ideal solution and the vapor is an ideal gas. Vapor pressures are 0.12 MPa for compound A, 80kPa for compound B, 0.15 MPa for compound C and 70kPa for compound D. At equilibrium the liquid phase consists of 36 mol% A, 33 mol% B, 11 mol% C and 20 mol% D. A. P = 0.42MPa; KT = 5.4 B. P = 0.42 MPa; KT = 0.185 C. P = 0.1 MPa; KT = 5.4 D. P = 0.1 MPa; KT = 0.185 E. Solution not possible with information given
The ____________________ is the most common type of temperature sensor.
Fill in the blank(s) with the appropriate word(s).
Use the convolution integral to find:
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