Thermodynamics

Question 1

Which law is the basis for the manufacture of thermometers?

Answer 1

Zeroth Law of Thermodynamics

Question 2

Energy is added to the water as work but is extracted from the water
as heat was performed by

Answer 2

Joule

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

Which of the following statement is correct?

Answer 4

Q + W is a state function

Question 5

The amount of heat absorbed when CO2 gas reacts with a solid CaO
to form solid CaCO3 is measured in a bomb calorimeter at constant
volume. The data obtained give a direct measure of

Answer 5

delta U

Question 6

For a constant pressure reversible process, the enthalpy (∆H)
change of the system is

Answer 6

Integral of Cp dT

Question 7

Cv is given b

Answer 7

(dU/dT)v

Question 8

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

Answer 8

Equation of state

Question 9

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

Answer 9

low pressure and high temperature

Question 10

Compressibility factor of a gas is

Answer 10

unity, if it follows PV = nRT

Question 11

Cp – Cv = R is valid for

Answer 11

ideal gases

Question 12

For monoatomic gases, Cp / Cv equals

Answer 12

1.67

Question 13

Isobaric process means a constant

Answer 13

pressure process

Question 14

For an isothermal process the internal energy of a gas

Answer 14

remains unchanged

Question 15

In an adiabatic process

Answer 15

heat transfer is zero

Question 16

From PVn = C, when n = 0, the process is

Answer 16

Isobaric

Question 17

From PVn = C, the process is isochoric if n equals

Answer 17

infinity

Question 18

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

Answer 18

triple point or below triple point

Question 19

An inventor claims to have a cyclic engine which exchanges heat
with reservoirs at 250C and 2500C, and which produces 0.45 kJ
of work for each kJ of heat extracted from the hot reservoir. Is the
claim believable?

Answer 19

no

Question 20

An inventor has devised a complicated non-flow process in which
1 mol of air is the working fluid. The net effects of the process are
claimed to be:
- A change in state of the air from 2500C and 3 bar to 800C and 1
bar.
- The production of 1800 J of work.
- The transfer of an undisclosed amount of heat to a heat reservoir
at 300C.
Determine whether the claimed performance of the process is
consistent with the second law. Assume that air is an ideal gas
for which Cp = (7/2)R

Answer 20

Yes

Question 21

Work output of turbine is __ the work input to the pump

Answer 21

greater than

Question 22

The efficiency of Carnot cycle is ___ the efficiency of Rankine
cycle

Answer 22

greater than

Question 23

The losses in condenser are

Answer 23

small

Question 24

0th law of thermodynamics

Answer 24

Ralph Howard Fowler

Question 25

2nd law of thermodynamics

Answer 25

Kelvin Planck

Question 26

1st law of thermodynamics

Answer 26

Rudolf Clausius

Question 27

How many intensive variables must be specified to fully describe a system containing mixture of water, liquid benzene and nitrogen.

Answer 27

2

Question 28

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

Answer 28

turbine

Question 29

Heat capacity is defined as C = dQ/dT, what is the difficulty about the relationship of C to Q which are supposedly state functions?

Answer 29

It is a process-dependent quantity

Question 30

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

Irreversible compression
Irreversible expansion
Reversible compression
Reversible expansion

Answer 30

Reversible expansion

Question 31

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

Answer 31

0