BME 340 MC Final

A gas in a piston-cylinder expands in a quasiequilbrium process. Which of the

following is TRUE?

• The pressure of the gas is equal to the pressure of the surroundings during the

  entire process

• The path of the process can be shown in a pressure vs. volume plot of the gas

• The expansion can be described by a polytropic process

• All of the above

• None of the above

In the Open System Energy Balance, the kinetic energy per unit mass is given by the

term V²/2. If the units for V²/2 is m²/s². If we want to convert kJ/kg to m²/s², what should be done?

• Multiply by 100

• Multiply by 1,000

• Divide by 100

• Divide by 1,000

• None of the above

Superheated water vapor in a piston-cylinder is slowly cooled at constant pressure

until it becomes a mixture of saturated liquid and saturated vapor. Which of the

following is TRUE during the process?

• The temperature remains constant

• The quality increases

• The change in enthalpy is equal to the heat lost to the surroundings

• All of the above

• None of the Above

Under which conditions would using the Table of properties for air as an ideal gas give

the least error?

• Low pressure and high temperature

• Low pressure and low temperature

• High pressure and high temperature

• High pressure and low temperature

• Not enough information is given to answer the question

Carbon dioxide gas is in a closed system with non-rigid walls. Which of the following

Work interaction(s) with the surrounding is (are) possible?

• Work due to electricity

• Pressure-volume Work

• Work by a paddle-wheel

• All of the above

• None of the above

Which of the following CANNOT be seen in a phase diagram of a pure substance?

• The temperature and pressure where liquid and vapor have identical properties

• Information on the quality of a mixture of saturated liquid and saturated vapor

• Information on whether the solid is less dense than the liquid

• All of the above

• None of the above

An ideal gas is in a closed system with rigid walls. It undergoes a process from State 1

to State 2 where its temperature changes. Which of the following is TRUE?

• The initial and final specific internal energies are equal

• The initial and final specific enthalpy are equal

• The initial and final pressures are not equal

• All of the above

• None of the above

Water is in a closed system at 150 kPa. If we know that it has a quality of 0.75, which

additional information will completely describe its state?

• Its temperature

• Its specific internal energy

• Its specific volume

• Any of the above

• None of the above

Which of the following definitely violates the 1st Law?

• A can of cold soda loses heat to a hot room

• A refrigerator left open in a small, insulated room in the morning makes the room

  colder at night.

• The heating of a pebble on the road by the sun causes it to float in the air

• All of the above

• None of the above

Water is in a closed system. If we know that it is at its triple point, which of the

following is already set?

• Its total volume

• Its total enthalpy

• Its total internal energy

• All of the above

• None of the above