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MCQs

Total Questions : 1058 | Page 85 of 106 pages
Question 841. Diesel cycle consists of __________ processes.
  1.    Two constant volume and two isentropic
  2.    Two constant volume and two isothermal
  3.    One constant pressure, one constant volume and two isentropic
  4.    Two constant pressure and two isentropic
 Discuss Question
Answer: Option C. -> One constant pressure, one constant volume and two isentropic
Question 842. The atomic mass of nitrogen is __________ oxygen.
  1.    More than
  2.    Less than
  3.    Equal to
  4.    None of these
 Discuss Question
Answer: Option B. -> Less than
Question 843. A tri-atomic molecule consists of __________ atoms.
  1.    Three
  2.    Two
  3.    Four
  4.    One
 Discuss Question
Answer: Option A. -> Three
Question 844. The throttling process is __________ process.
  1.    Reversible or irreversible
  2.    Irreversible
  3.    None of these
  4.    Reversible
 Discuss Question
Answer: Option B. -> Irreversible
Question 845. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
  1.    Carbonization
  2.    None of these
  3.    Combustion
  4.    Atomization
 Discuss Question
Answer: Option A. -> Carbonization
Question 846. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
  1.    1 - (1/r) γ - 1/ γ
  2.    1 - (1/r) γ/γ - 1
  3.    rγ - 1
  4.    1 - rγ - 1
 Discuss Question
Answer: Option A. -> 1 - (1/r) γ - 1/ γ
Question 847. According to Avogadro's Hypothesis
  1.    Gases have two values of specific heat
  2.    Product of the gas constant and the molecular weight of an ideal gas is constant
  3.    The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
  4.    The sum of partial pressure of mixture of two gases is sum of the two
 Discuss Question
Answer: Option C. -> The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
Question 848. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is
  1.    Theoretically possible
  2.    May be possible with lot of sophistications
  3.    Not possible
  4.    Cost will be very high
 Discuss Question
Answer: Option C. -> Not possible
Question 849. Characteristic gas constant of a gas is equal to
  1.    Cv /Cp
  2.    Cp /Cv
  3.    Cp - Cv
  4.    Cp + Cv
 Discuss Question
Answer: Option C. -> Cp - Cv
Question 850. The variables which control the physical properties of a perfect gas are
  1.    Volume occupied by the gas
  2.    All of these
  3.    Temperature of the gas
  4.    Pressure exerted by the gas
 Discuss Question
Answer: Option B. -> All of these

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