Online Chemical Engineering Test - Thermodynamics Test 2

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Total number of questions: 20.
Time allotted: 30 minutes.
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Boyle's law for gases states that

, when temperature is constant.

, when temperature & mass of the gas remain constant.

P ∝ V, at constant temperature & mass of the gas.

= constant, for any gas.

[#]

During Joule-Thomson expansion of gases

enthalpy remains constant.

entropy remains constant.

temperature remains constant.

none of these.

[#]

The absolute entropy for all crystalline substances at absolute zero temperature is

zero

negative

more than zero

indeterminate

[#]

Critical temperature is defined as the temperature above which a gas will

not liquify (barring exceptions).

immediately liquify.

never liquify however high the pressure may be.

none of these.

[#]

Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.

polar

non-polar

both (a) & (b)

neither (a) nor (b)

[#]

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).

[#]

In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

enhanced COP.

decreased COP.

no change in the value of COP.

increased or decreased COP ; depending upon the type of refrigerant.

[#]

As the temperature is lowered towards the absolute zero, the value of the quantity

approaches

zero

unity

infinity

none of these

[#]

With increase in compression ratio, the efficiency of the otto engine

increases

decreases

remains constant

increases linearly

[#]

10.

The unit of fugacity is the same as that of the

pressure

temperature

volume

molar concentration

[#]

11.

The intensive properties are

molar volume, density, viscosity and boiling point.

refractive index and surface tension.

both (a) and (b).

none of these.

[#]

12.

Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is

∞

none of these

[#]

13.

Gibbs-Duhem equation

states that n₁dμ₁ + n₂dμ₂ + ....n_jdμ_j = 0, for a system of definite composition at constant temperature and pressure.

applies only to binary systems.

finds no application in gas-liquid equilibria involved in distillation.

none of these

[#]

14.

After throttling, gas temperature

decreases

increases

remains same

may increase or decrease ; depends on the nature of the gas

[#]

15.

The expression,

, is for the____of an ideal gas.

compressibility

work done under adiabatic contition

work done under isothermal condition

co-efficient of thermal expansion

[#]

16.

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

Bomb

Separating

Bucket

Throttling

[#]

17.

On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)_s and the slope of the reversible isothermal line (∂P/∂V)_T are related as (where, y = C_p/C_v)

(∂P/∂V)_S = (∂P/∂V)_T

(∂P/∂V)_S = [(∂P/∂V)_T]^Y

(∂P/∂V)_S = y(∂P/∂V)_T

(∂P/∂V)_S = 1/y(∂P/∂V)_T

[#]

18.

Normal temperature and pressure (N.T.P.) corresponds to

0°C and 760 mm Hg.

15°C and 760 mm Hg.

20°C and 760 mm Hg.

0°C and 1 kgf/cm².

[#]

19.

The adiabatic throttling process of a perfect gas is one of constant enthalpy

in which there is a temperature drop.

which is exemplified by a non-steady flow expansion.

which can be performed in a pipe with a constriction.

in which there is an increase in temperature.

[#]

20.

At absolute zero temperature, the __________ of the gas is zero.

pressure

volume

mass

none of these

[#]

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