Chapter 6 Multiple choice questions

. Section 6.2 describes early steam engines. What was James Watt's key invention that improved their efficiency?

. How big is a horsepower in kilowatts?

. Section 6.3 describes the principles of heat engines. Box 6.3 describes temperature scales and Carnot's formula. The size of a degree is the same in the Celsius and Kelvin scales but how do you convert between the scales?
Temperature in kelvins =

. Hot steam enters an engine at 177 degrees Celsius and is condensed to water at 27 degrees Celsius. What will be the Carnot efficiency of such an engine?

. Section 6.3 also describes the three Laws of Thermodynamics. What does the Second Law say?

. Section 6.4 describes the age of steam. Box 6.5 describes the important properties of fluids such as water under pressure. What is atmospheric pressure approximately, expressed in units of megapascals?

. Water boils at 100 degrees Celsius at atmospheric pressure. What happens to the boiling point as the pressure is increased?

. What happens to water above a temperature of 374 degrees Celsius and a pressure of 22 megapascals?

. Section 6.5 describes power station turbine systems. How fast does a typical large power station turbine rotate?

. Section 6.6 describes power station turbine systems. A cooling tower cools which element of a power station system?

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