Question 1

Based on the generalized charts, the error involved in the enthalpy of CO2 at 350 K and 9 MPa if it is assumed to be an ideal gas is

Accepted Answer

A) 0 
B) 20% 
C) 55% 
D) 30% 
E) 70% 
A) 0 
B) 20% 
C) 55% 
D) 30% 
E) 70% D

Question 2

An ideal gas is throttled to a lower pressure. During this process, (select the correct statement)

Accepted Answer

A) the temperature of the gas will increase. 
B) the temperature of the gas will decrease. 
C) the temperature of the gas will remain constant. 
D) the entropy of the gas will decrease. 
E) the enthalpy of the gas will decrease. 
A) the temperature of the gas will increase. 
B) the temperature of the gas will decrease. 
C) the temperature of the gas will remain constant. 
D) the entropy of the gas will decrease. 
E) the enthalpy of the gas will decrease. C

Question 3

Of the five statements below about the specific heat difference Cp - Cv, chose the wrong one:

Accepted Answer

A) The specific heat difference Cp - Cv of a substance is positive or zero. 
B) The specific heat difference Cp - Cv at a given absolute temperature T is proportional to T. 
C) The specific heat difference Cp - Cv is zero for incompressible substances. 
D) The specific heat difference Cp - Cv of an ideal gas is independent of temperature. 
E) The specific heat difference Cp - Cv is proportional to isothermal compressibility. 
A) The specific heat difference Cp - Cv of a substance is positive or zero. 
B) The specific heat difference Cp - Cv at a given absolute temperature T is proportional to T. 
C) The specific heat difference Cp - Cv is zero for incompressible substances. 
D) The specific heat difference Cp - Cv of an ideal gas is independent of temperature. 
E) The specific heat difference Cp - Cv is proportional to isothermal compressibility. E

Question 4

Based on data from the steam tables, the Joule-Thompson coefficient of steam at 3 MPa and 300°C is approximately

Accepted Answer

A) 0 
B) -5°C/MPa 
C) 12°C/MPa 
D) 8°C/MPa 
E) 26°C/MPa 
A) 0 
B) -5°C/MPa 
C) 12°C/MPa 
D) 8°C/MPa 
E) 26°C/MPa

Question 5

A substance whose Joule-Thomson coefficient is positive is throttled to a lower pressure. During this process, (select the correct statement)

Accepted Answer

A) the temperature of the substance will increase. 
B) the temperature of the substance will decrease. 
C) the entropy of the substance will remain constant. 
D) the entropy of the substance will decrease. 
E) the enthalpy of the substance will decrease. 
A) the temperature of the substance will increase. 
B) the temperature of the substance will decrease. 
C) the entropy of the substance will remain constant. 
D) the entropy of the substance will decrease. 
E) the enthalpy of the substance will decrease.

Based on the generalized charts, the error involved in the enthalpy of CO₂ at 350 K and 9 MPa if it is assumed to be an ideal gas is

An ideal gas is throttled to a lower pressure. During this process, (select the correct statement)

Of the five statements below about the specific heat difference C_p - C_v, chose the wrong one:

Based on data from the steam tables, the Joule-Thompson coefficient of steam at 3 MPa and 300°C is approximately

A substance whose Joule-Thomson coefficient is positive is throttled to a lower pressure. During this process, (select the correct statement)

Introduction and Basic Concepts

Energy, Energy Transfer, and General Energy Analysis

Properties of Pure Substances

Energy Analysis of Closed Systems

Mass and Energy Analysis of Control Volumes

The Second Law of Thermodynamics

Entropy

Exergy: A Measure of Work Potential

Gas Power Cycles

Vapor and Combined Power Cycles

Refrigeration Cycles

Gas Mixtures

Gas-Vapor Mixtures and Air-Conditioning

Chemical Reactions

Chemical and Phase Equilibrium

Compressible Flow

Filters

Exam 12: Thermodynamic Property Relations

Based on the generalized charts, the error involved in the enthalpy of CO2 at 350 K and 9 MPa if it is assumed to be an ideal gas is

An ideal gas is throttled to a lower pressure. During this process, (select the correct statement)

Of the five statements below about the specific heat difference Cp - Cv, chose the wrong one:

Based on data from the steam tables, the Joule-Thompson coefficient of steam at 3 MPa and 300°C is approximately

A substance whose Joule-Thomson coefficient is positive is throttled to a lower pressure. During this process, (select the correct statement)

Introduction and Basic Concepts

Energy, Energy Transfer, and General Energy Analysis

Properties of Pure Substances

Energy Analysis of Closed Systems

Mass and Energy Analysis of Control Volumes

The Second Law of Thermodynamics

Entropy

Exergy: A Measure of Work Potential

Gas Power Cycles

Vapor and Combined Power Cycles

Refrigeration Cycles

Gas Mixtures

Gas-Vapor Mixtures and Air-Conditioning

Chemical Reactions

Chemical and Phase Equilibrium

Compressible Flow

Filters

Based on the generalized charts, the error involved in the enthalpy of CO₂ at 350 K and 9 MPa if it is assumed to be an ideal gas is

Of the five statements below about the specific heat difference C_p - C_v, chose the wrong one: