Online Chemical Engineering Test - Thermodynamics Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
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Heat pump

accomplishes only space heating in winter.

accomplishes only space cooling in summer.

accomplishes both (a) and (b).

works on Carnot cycle.

[#]

An isolated system can exchange __________ with its surroundings.

matter

energy

neither matter nor energy

both matter and energy

[#]

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.

C_P and C_V are state function.

[#]

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

equation of state

Gibbs Duhem equation

ideal gas equation

none of these

[#]

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

R log_e 4

R log₁₀ 4

C_v log₁₀ 4

C_v log_e 4

[#]

Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature.

decreases

increases

remains constant

decreases logarithmically

[#]

For an irreversible process involving only pressure-volume work

(dF)_T, p <0

(dF)_T, p = 0

(dF)_T, p > 0

(dA)_T, v >0

[#]

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

directly proportional

inversely proportional

equal

none of these

[#]

If we increase the pressure on a substance (which is at its triple point), then the triple point

increases

decreases

remains unchanged

may increase or decrease ; depends on the substance

[#]

10.

Pick out the wrong statement.

System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature.

Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature.

Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures.

none of these

[#]

11.

Joule-Thomson co-efficient which is defined as,

, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is

∞

+ve

-ve

[#]

12.

In any spontaneous process, the __________ free energy decreases.

Helmholtz

Gibbs

both a & b

neither 'a' nor 'b'

[#]

13.

Air-refrigeration cycle

is the most efficient of all refrigeration cycles.

has very low efficiency.

requires relatively large quantities of air to achieve a significant amount of refrigeration.

both (b) and (c).

[#]

14.

The temperature at the eutectic point of the system is the __________ temperature that can be attained in the system.

lowest

highest

average

none of these

[#]

15.

Melting of ice is an example of an __________ process.

adiabatic

isothermal

isometric

none of these

[#]

16.

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

superheated vapour.

partially condensed vapour with quality of 0.9.

saturated vapour.

partially condensed vapour with quality of 0.1.

[#]

17.

Gibbs free energy (F) is defined as

F = E - TS

F = H - TS

F = H + TS

F = E + TS

[#]

18.

Fugacity and pressure are numerically not equal for the gases

at low temperature and high pressure.

at standard state.

both (a) and (b).

in ideal state.

[#]

19.

For an ideal liquid solution, which of the following is unity ?

Activity

Fugacity

Activity co-efficient

Fugacity co-efficient

[#]

20.

For any system, what is the minimum number of degrees of freedom?

[#]

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