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Total Questions : 2096 | Page 206 of 210 pages
Question 2051. 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
 Discuss Question
Answer: Option A. -> Superheated vapour
Question 2052. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the
  1.    Kopp's rule
  2.    Le-Chatelier principle
  3.    Law of corresponding state
  4.    Arrehenius hypothesis
 Discuss Question
Answer: Option B. -> Le-Chatelier principle
Question 2053. The extensive properties are
  1.    Free energy, entropy and enthalpy
  2.    Volume, mass and number of moles
  3.    None of these
  4.    Both A and B
 Discuss Question
Answer: Option D. -> Both A and B
Question 2054. A system is said to be isopiestic, if there is no __________ change.
  1.    Volume
  2.    None of these
  3.    Temperature
  4.    Pressure
 Discuss Question
Answer: Option D. -> Pressure
Question 2055. The intensive properties are
  1.    Both A and B
  2.    Refractive index and surface tension
  3.    None of these
  4.    Molar volume, density, viscosity and boiling point
 Discuss Question
Answer: Option A. -> Both A and B
Question 2056. Which of the following has the least thermal efficiency?
  1.    Diesel engine
  2.    Otto engine
  3.    Carnot engine
  4.    Steam engine
 Discuss Question
Answer: Option D. -> Steam engine
Question 2057. The third law of thermodynamics states that the
  1.    Gases having same reduced properties behave similarly
  2.    Heat capacity of a crystalline solid is zero at absolute zero temperature
  3.    None of these
  4.    Heat transfer from low temperature to high temperature source is not possible without external work
 Discuss Question
Answer: Option B. -> Heat capacity of a crystalline solid is zero at absolute zero temperature
Question 2058. When dilute aqueous solutions of two salts are mixed, the process is associated with
  1.    Decrease in temperature
  2.    Increase in temperature
  3.    Change in temperature which is a function of composition
  4.    No change in temperature
 Discuss Question
Answer: Option B. -> Increase in temperature
Question 2059. Heat of reaction at constant volume is identified with __________ change.
  1.    Neither A nor B
  2.    Either A or B
  3.    Enthalpy
  4.    Internal energy
 Discuss Question
Answer: Option D. -> Internal energy
Question 2060. Change of state namely evaportation condensation, freezing and melting is an __________ process.
  1.    Isochoric
  2.    Isothermal
  3.    Adiabatic
  4.    Isobaric
 Discuss Question
Answer: Option B. -> Isothermal

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