4

__________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

Bucket

Throttling

Separating

A combination of separating & throttling

D. A combination of separating & throttling

4

Free energy

Decreases in all spontaneous (or irreversible) processes

Change during a spontaneous process has a negative value

Remains unchanged in reversible processes carried at constant temperature and pressure

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

4

Carnot

Air

Absorption

vapour-ejection

4

Pressure

Volume

Mass

None of these

4

Pick out the wrong statement

Phase rule variables are intensive properties

Heat and work are both state function

The work done by expansion of a gas in vacuum is zero

CP and CV are state function

4

Rectangle

Rhombus

Trapezoid

Circle

4

Molten sodium

Mercury

Molten potassium

4

(∂E/∂T)V is the mathematical expression for

CV

Enthalpy change

Free energy change

None of these

4

dE = CpdT

dE = CvdT

dQ = dE + pdV

dW = pdV

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

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

Vapour phase behaves as an ideal gas

Heat of vaporisation is independent of temperature

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

4

A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

its internal energy (U) decreases and its entropy (S) increases

U and S both decreases

U decreases but S is constant

U is constant but S decreases

4

P1ACBP2P1

ACBB1A1A

ACBDA

4

+ve

0

-ve

4

First law of thermodynamics deals with the

Direction of energy transfer

Reversible processes only

Irreversible processes only

None of these

4

Isothermal

Isobaric

Polytropic

4

Which is not constant for an ideal gas?

(∂P/∂V)T

(∂V/∂T)P

(∂P/∂V)V

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

4

Gibbs-Helmholtz equation is

ΔF = ΔH + T [∂(ΔF)/∂T]P

ΔF = ΔH - TΔT

d(E - TS) T, V < 0

dP/dT = ΔHvap/T.ΔVvap

4

The intensive properties are

Molar volume, density, viscosity and boiling point

Refractive index and surface tension

Both (A) and (B)

None of these

4

A refrigeration cycle is the same as a __________ cycle,

Turbine

Heat engine

Reversed heat engine

None of these

4

Work done in an adiabatic process between two states depends on the

Rate of heat transmission

Initial state only

End states only

None of these

4

0

1

2

3

4

Third law of thermodynamics is helpful in

Prediction of the extent of a chemical reaction

Calculating absolute entropies of substances at different temperature

Evaluating entropy changes of chemical reaction

Both (B) and (C)

4

The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

(R/ΔH) (1/T1 - 1/T2)

(ΔH/R) (1/T1 - 1/T2)

(ΔH/R) (1/T2 - 1/T1)

(1/R) (1/T1 - 1/T2)

4

For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

Decreases

Increases

Remain same

Decreases linearly

4

For a spontaneous process, free energy

Is zero

Increases

Decreases whereas the entropy increases

And entropy both decrease

4

Isobaric

Isenthalpic

Both (B) & (C)

4

All gases above its inversion temperature, in a throttling process will show

A heating effect

No change in temperature

A cooling effect

Either (A) or (C)

4

Chemical potential is a/an

Extensive property

Intensive property

Force which drives the chemical system to equilibrium

Both (B) and (C)

4

300 × (32/7)

300 × (33/5)

300 × (333/7)

300 × (35/7)

4

Minimum

Zero

Maximum

None of these