Finals (1-5)

Question 1

The word Thermodynamics denotes

Answer 1

Power from Heat

Question 2

Which of the following is not conserved in ordinary process
a. mass
b. energy
c. entropy
d. none of these

Answer 2

C

Question 3

For the three real roots of a cubic equation of state for a pure fluid which is insignificant

Answer 3

middle root

Question 4

Volume expansivity and isothermal compressibility is zero for

Answer 4

Incompressible fluids

Question 5

The Mollier Chart is thermodynamics diagram of

Answer 5

H vs S

Question 6

For an actual heat engine, the entropy change in a complete cycle is

Answer 6

Zero

Question 7

If the vacuum pressure indicated by an instrument is 10 mmHg and the barometric pressure is 760 mmHg, what is the absolute pressure of the system

Answer 7

750 mmHg

Question 8

The simplest realistic model of material behaviour is that of

Answer 8

ideal gas

Question 9

If the temperature of the hot and cold reservoirs in a Carnot engine are doubled, thermal efficiency

Answer 9

remains the same

Question 10

It is impossible solely to achieve in a system operated over a complete cycle, the transfer of energy from a body at a low temperature to one at a higher temperature

Answer 10

Claussius Statement

Question 11

The standard heat of combustion is always based on 1 mol of burned

Answer 11

substance

Question 12

For a polytropic process PV^n = constant for an ideal gas when n is 1, it is in what process?

Answer 12

Isothermal

Question 13

For an ideal gas, the enthalpy is a function only of

Answer 13

temperature

Question 14

When energy in the form of heat is added to a body. It is stored as what energy of the body

Answer 14

Internal energy

Question 15

The Watson correlation is used to estimate latent heat of

Answer 15

Vaporization

Question 16

The molar specific heat at constant pressure of a monatomic gas is equivalent to

Answer 16

5/2 R

Question 17

In a compression process, the work requirement of an irreversible process is always ____ that of a reversible process

Answer 17

greater than

Question 18

The continuity equation is a/an

Answer 18

mass balance equation

Question 19

For a free falling body, neglecting air resistance, which of the following statements is true

Answer 19

The changes of the sum of potential and kinetic energies are equal to zero

Question 20

The ratio of PV/RT is the

Answer 20

compressibility factor

Question 21

The total entropy in the entire universe is

Answer 21

increasing

Question 22

Which of the following statements about work and heat is true

Answer 22

A body may not obtain both heat and work

Question 23

At higher temperature, the standard heat of combustion is

Answer 23

higher

Question 24

If the change in energy of the system is negative, then the change in entropy of the surroundings is

Answer 24

positive

Question 25

Which of the following heat effects is characterized by a temperature change

Answer 25

Sensible heat

Question 26

A closed system

Answer 26

does not permit transfer of matter but allows energy

Question 27

If a gas confided in a cylinder by a piston is allowed to expand in a total vacuum. Which is true a. Q= 0 b. W= 0 c. ∆U= 0 d. all of these

Answer 27

W = 0

Question 28

The temperature for which the limit of (∂z/∂P) at T = k as P approaches zero

Answer 28

Boyle

Question 29

For a closed system undergoing the same change of state by different processes with negligible kinetic and potential energy changes, will give

Answer 29

equal Q + W

Question 30

The entropy change for any closed system which undergoes an irreversible adiabatic process

Question 31

The work accompanying a change in volume of a fluid can be assumed reversible if

Answer 31

Pressure of fluid is never more than minutely out of balance with external pressure

Question 32

A gas that suddenly expands may be considered to undergo a process that is

Answer 32

irreversible adiabatic

Question 33

An isochoric process is also

Answer 33

Isometric

Question 34

For a pure, two phase fluid system, the state of the system is fixed when how many thermodynamic properties are set

Answer 34

One

Question 35

For a constant pressure process, dH is simplified to

Answer 35

dU + Pdv

Question 36

If work is done by the system the reversible work is

Answer 36

greater than the actual work

Question 37

Which of the following statements characterizes a compressed liquid a. its T is lower than Tsat corresponding to its P b. its P is lower than the Psat corresponding to its T c. its T is higher than the Tsat corresponding to its P d. none of these

Answer 37

A

Question 38

On a PV diagram heat and work are associated with

Answer 38

Areas

Question 39

A saturated aqueous salt solution at its boiling point with excess salt crystals present has how many phases

Answer 39

One

Question 40

Flow work for an ideal gas at constant temperature is equal to

Answer 40

-V∆P