ChE Thermodynamics

Question 1

Which law is the basis for the manufacture of thermometer?

Answer 1

Zeroth Law of Thermodynamics (thermal equilibrium)

Question 2

Who coined the Zeroth Law of Thermodynamics?

Answer 2

Ralph Howard Fowler

Question 3

These properties depend on the current state of the system and not on how the system reaches that state

Answer 3

State functions

Question 4

Other name for the first law of thermodynamics

Answer 4

Law of Conservation of Energy (energy can neither be created nor destroyed and can only be transformed in various forms)

Question 5

Who coined the Law of Conservation of Energy?

Answer 5

Rudolf Julius Emmanuel Clausius

Question 6

Examples of state functions

Answer 6

Enthalpy (H), Entropy (S), Temperature, Pressure, Internal Energy

Question 7

Examples of path functions

Answer 7

Heat (Q) and Work (W)

Question 8

Which of the following statement is correct?
A. The standard heat of formation of an element is negative.
B. Since dH = dU + dPV and can never be equal to dU
C. Q and W are state functions
D. Q + W is a state function

Answer 8

D.

Question 9

Formula for internal energy (U)

Answer 9

U = Q + W

Question 10

It is the energy needed to create the system

Answer 10

Internal Energy (U)

Question 11

It is the total heat of the system

Answer 11

Enthalpy (H)

Question 12

Formula for enthalpy

Answer 12

dH = dU + dPV

Question 13

For constant volume (isochoric) process, heat (Q) is equal to?

Answer 13

Internal energy (U)

Question 14

For constant pressure (isobaric) process, heat (Q) is equal to?

Answer 14

Enthalpy (H)

Question 15

Formula for enthalpy (H) during isobaric processes

Answer 15

dH = integral of CpdT

Question 16

Formula for internal energy (U) during isochoric processes

Answer 16

dU = integral of CvdT

Question 17

Formula for CV at constant volume process

Answer 17

Cv = (partial derivative of U)/(partial derivative of T)

Question 18

Equation which relates pressure, volume, and temperature of a gas is called

Answer 18

Equation of state

Question 19

The equation, PV=nRT is best obeyed by gases at

Answer 19

low pressure, high temp

Question 20

The compressibility factor of a gas is:
A) not a function of pressure
B) not a function of its nature
C) not a function of its temperature
D) Unity, as it followes PV=nRT

Answer 20

D.

Question 21

For monoatomic gases, Cp/Cv is equal to?

Answer 21

1.67

Question 22

For diatomic gases, Cp/Cv is equal to?

Answer 22

1.4

Question 23

Cp and Cv formulas for monoatomic gases

Answer 23

Cp = 5R/2
Cv = 3R/2

Question 24

Cp and Cv formula for diatomic gases

Answer 24

Cp = 7R/2
Cv = 5R/2

Question 25

What happens to the internal energy of a gas during an isothermal process?

Answer 25

Remains unchanged

Question 26

In an adiabatic process

Answer 26

Heat transfer is zero

Question 27

From PV^n, when n=0, the process is

Answer 27

Isobaric

Question 28

From PV^n, when n=1, the process is

Answer 28

Isothermal

Question 29

From PV^n, when n=sigma, the process is

Answer 29

Adiabatic

Question 30

A solid is transformed into vapor without going through the liquid phase at?

Answer 30

Below the triple point, or at triple point

Question 31

Formula for irreversible work when reversible work is positive

Answer 31

Wirrev= Wrev/efficiency

Question 32

Formula for irreversible work when reversible work is negative

Answer 32

Wirrev= Wrev(efficiency)

Question 33

Other formula for virial coefficient of state

Answer 33

PV/RT = (1+ B/V+ C/V^2)

Question 34

Adiabatic Relations Page sa perry’s

Answer 34

10-64

Question 35

Actual work divided by the corresponding ideal work is known as ___ efficiency.

Answer 35

Turbine

Question 36

Heat capacity is defined as C = dQ/dT, what is the difficulty about the relationship of C to Q which are supposedly state functions?
A. It is a process-dependent quantity
B. It indicates that small temp changes have smaller capacities
C. It is not an intensive property
D. It presents heat as energy in transit

Answer 36

A.

Question 37

Which gives the most work we can get out of an adiabatic system?

Answer 37

Reversible expansion

Question 38

What happens to delta U when work is done by the system during the adiabatic expansion of ideal gas?

Answer 38

Decreases

Question 39

Formula for Tr and Pr

Answer 39

Tr = T/Tc
Pr = P/Pc