Chemical Engineering Thermodynamics

331. Specific volume of an ideal gas is

  1. Equal to its density
  2. The reciprocal of its density
  3. Proportional to pressure
  4. None of these

Correct answer: (B)
The reciprocal of its density

332. Specific/molar Gibbs free energy for a pure substance does not change during

  1. Sublimation
  2. Vaporisation
  3. Melting
  4. Either (A), (B) or (C)

Correct answer: (D)
Either (A), (B) or (C)

333. Standard temperature and pressure (S.T.P.) is

  1. 0°C and 750 mm Hg
  2. 15°C and 750 mm Hg
  3. 0°C and 1 kgf/cm2
  4. 15°C and 1 kgf/cm2

Correct answer: (A)
0°C and 750 mm Hg

334. 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

  1. Superheated vapour
  2. Partially condensed vapour with quality of 0.9
  3. Saturated vapour
  4. Partially condensed vapour with quality of 0.1

Correct answer: (A)
Superheated vapour

335. Sublimation temperature of dry ice (solid CO2) is _________ °C.

  1. -273
  2. 0
  3. -78
  4. 5

Correct answer: (C)
-78

336. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

  1. Increase
  2. Decrease
  3. Remain unchanged
  4. First fall and then rise

Correct answer: (A)
Increase

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

  1. Zero
  2. Negative
  3. More than zero
  4. Indeterminate

Correct answer: (A)
Zero

338. The acentric factor of a materical, 'ω', is defined as ω = -log10(Pr sat)Tr -1 = 0.7, where, Pr sat = reduced vapor pressure, Tr = reduced temperature. The value of acentric factor is always

  1. > 2
  2. < 1
  3. > 1
  4. < 3

Correct answer: (B)
< 1

339. The activity of an ideal gas is numerically _________ its pressure.

  1. More than
  2. Less than
  3. Equal to
  4. Data insufficient, can't be predicted

Correct answer: (C)
Equal to

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

  1. In which there is a temperature drop
  2. Which is exemplified by a non-steady flow expansion
  3. Which can be performed in a pipe with a constriction
  4. In which there is an increase in temperature

Correct answer: (C)
Which can be performed in a pipe with a constriction

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