Home
Current Affairs January 2024

What is the correct answer?

4

The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is

A.

B. 1

C. 0

D. -ve

Correct Answer :

C. 0


Related Questions

What is the correct answer?

4

Third law of thermodynamics is concerned with the

A. Value of absolute entropy

B. Energy transfer

C. Direction of energy transfer

D. None of these

What is the correct answer?

4

Claude's liquefaction process employs the cooling of gases by

A. Expansion in an engine

B. Following a constant pressure cycle

C. Throttling

D. None of these

What is the correct answer?

4

The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for

A. Reversible isothermal volume change

B. Heating of a substance

C. Cooling of a substance

D. Simultaneous heating and expansion of an ideal gas

What is the correct answer?

4

For a given substance at a specified temperature, activity is __________ to fugacity.

A. Directly proportional

B. Inversely proportional

C. Equal

D. None of these

What is the correct answer?

4

The standard state of a gas (at a given temperature) is the state in which fugacity is equal to

A. Unity

B. Activity

C. Both (A) & (B)

D. Neither (A) nor (B)

What is the correct answer?

4

The extensive properties are

A. Volume, mass and number of moles

B. Free energy, entropy and enthalpy

C. Both (A) and (B)

D. None of these

What is the correct answer?

4

The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

A. Internal energy

B. Enthalpy

C. Gibbs free energy

D. Helmholtz free energy

What is the correct answer?

4

Enthalpy changes over a constant pressure path are always zero for __________ gas.

A. Any

B. A perfect

C. An easily liquefiable

D. A real

What is the correct answer?

4

To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the

A. Volume of the liquid phase is negligible compared to that of vapour phase

B. Vapour phase behaves as an ideal gas

C. Heat of vaporisation is independent of temperature

D. All (A), (B) & (C)

What is the correct answer?

4

Which of the following decreases with increase in pressure?

A. Melting point of ice

B. Melting point of wax

C. Boiling point of liquids

D. None of these

What is the correct answer?

4

1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be

A. 35 K

B. 174 K

C. 274 K

D. 154 K

What is the correct answer?

4

For an isothermal process, the internal energy of a gas

A. Increases

B. Decreases

C. Remains unchanged

D. Data insufficient, can't be predicted

What is the correct answer?

4

The internal energy of an ideal gas is a function of its __________ only.

A. Molecular size

B. Volume

C. Pressure

D. Temperature

What is the correct answer?

4

Fundamental principle of refrigeration is based on the __________ law of thermodynamics.

A. Zeroth

B. First

C. Second

D. Third

What is the correct answer?

4

For an exothermic reaction

A. Only enthalpy change (ΔH) is negative

B. Only internal energy change (ΔE) is negative

C. Both ΔH and ΔE are negative

D. Enthalpy change is zero

What is the correct answer?

4

Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

A. Superheated vapour

B. Partially condensed vapour with quality of 0.9

C. Saturated vapour

D. Partially condensed vapour with quality of 0.1

What is the correct answer?

4

In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is

A. More

B. Less

C. Same

D. Unpredictable; depends on the particular reaction

What is the correct answer?

4

An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to

A. 12 P1V1

B. 6 P1 V1

C. 3 P1V1

D. P1 V1

What is the correct answer?

4

Adiabatic compression of a saturated water vapour makes it

A. Supersaturated

B. Superheated

C. Both (A) and (B)

D. Neither (A) nor (B)

What is the correct answer?

4

In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

A. Increase the partial pressure of I2

B. Decrease the partial pressure of HI

C. Diminish the degree of dissociation of HI

D. None of these

What is the correct answer?

4

The most important application of distribution law is in

A. Evaporation

B. Liquid extraction

C. Drying

D. Distillation

What is the correct answer?

4

The work done in isothermal compression compared to that in adiabatic compression will be

A. Less

B. More

C. Same

D. More or less depending upon the extent of work done

What is the correct answer?

4

Kopp's rule is used to calculate the heat capacity of

A. Solids

B. Liquids

C. Gases

D. All (A), (B) & (C)

What is the correct answer?

4

Which is an example of closed system?

A. Air compressor

B. Liquid cooling system of an automobile

C. Boiler

D. None of these

What is the correct answer?

4

Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)?

A. Air cycle

B. Carnot cycle

C. Ordinary vapour compression cycle

D. Vapour compression with a reversible expansion engine

What is the correct answer?

4

Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K

A. 0

B.

C. 50

D. 100

What is the correct answer?

4

What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?

A. 2

B. 0

C. 3

D. 1

What is the correct answer?

4

Gibbs-Duhem equation

A. States that n11 + n22 + ....njj = 0, for a system of definite composition at constant temperature and pressure

B. Applies only to binary systems

C. Finds no application in gas-liquid equilibria involved in distillation

D. None of these

What is the correct answer?

4

If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in

A. Volume

B. Enthalpy

C. Both (A) & (B)

D. Neither (A) nor (B)

What is the correct answer?

4

The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.

A. Temperature

B. Pressure

C. Composition

D. All (A), (B) and (C)