LIQUEFACTION OF GASES MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
LIQUEFACTION OF GASES
MULTIPLE CHOICE QUESTIONS
(MCQ) WITH ANSWERS
When a gas is at a lower than its
inversion temperature, cooling
occurs on expansion. Thus, must
bring gases below inversion
temperatures before liquefaction.
1. When air expands at room temperature
(a) Produce heating
(b) Cooling produces
(c) Neither heating nor cooling produces
(d) None
(Ans: b)
2. When Hydrogen expands at room temperature
(a) Produce heating
(b) Cooling produces
(c) Neither heating nor cooling produces
(d) None
(Ans: a)
3. When Nitrogen expands at room temperature
(a) Produce heating
(b) Cooling produces
(c) Neither heating nor cooling produces
(d) None
(Ans: b)
4. When Helium expands at room temperature
(a) Produce heating
(b) Cooling produces
(c) Neither heating nor cooling produces
(d) None
(Ans: a)
5. When expansion occurs at a temperature higher than the inversion temperature
(a) Cooling takes place
(b) Heating takes place
(c) Neither cooling nor heating takes place
(d) None
(Ans: b)
6. When expansion occurs at a temperature lower than the inversion temperature
(a) Cooling takes place
(b) Heating takes place
(c) Neither cooling nor heating takes place
(d) None
(Ans: a)
7. When expansion occurs at the inversion temperature
(a) Cooling takes place
(b) Heating takes place
(c) Neither cooling nor heating takes place
(d) None
(Ans: c)
8. The inversion temperature of air is
(a) > 0
(b) <0
(c) = 0
(d) None
(Ans: a)
9. The inversion temperature of hydrogen is
(a) > 0
(b) <0
(c) = 0
(d) None
(Ans: b)
10. The inversion temperature of Helium is
(a) > 0
(b) <0
(c) = 0
(d) None
(Ans: b)
11. Principle of liquefaction of a gas is
(a) Free expansion
(b) Isentropic expansion
(c) Throttling expansion
(d) None
(Ans: c)
12. Pressure at which a gas liquefies
(a) > atmospheric pressure
(b) = atmospheric pressure
(c) < atmospheric pressure
(d) None
(Ans: b)
13. Which method of air liquefaction is more efficient
(a) Linde’s Method
(b) Claude’s Method
(c) Cascade Method
(d) None
(Ans: b)
14. Liquefaction brings
(a) Compactness
(b) Bulkiness
(c) compactness as well as bulkiness
(d) None
(Ans: a)
15. Critical temperature of carbon dioxide gas is
(a) +31.1 0C
(b) -31.10C
(c) -11.10C
(d) None
ANS: (a)
16. Which gas cannot be liquefied by Linde’s Process
(a) Nitrogen
(b) Hydrogen
(c) Oxygen
(d) None
ANS: (b)
17. A gas is liquefied by
(a) First increasing the pressure & then decreasing
(b) Decreasing the pressure & then increasing
(c) Both (a) & (b)
ANS: (a)
20. Pressure at the critical temperature is
(a) low
(b) high
(c) Medium
(d) None
ANS: (b)
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