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MCQs

Total Questions : 1058 | Page 86 of 106 pages
Question 851. The following cycle is used for air craft refrigeration
  1.    Brayton cycle
  2.    Carnot cycle
  3.    Joule cycle
  4.    Reversed Brayton cycle
 Discuss Question
Answer: Option D. -> Reversed Brayton cycle
Question 852. In closed cycle gas turbine, the air is compressed
  1.    Polytropically
  2.    Isentropically
  3.    None of these
  4.    Isothermally
 Discuss Question
Answer: Option B. -> Isentropically
Question 853. A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
  1.    327°C
  2.    654°C
  3.    54°C
  4.    108°C
 Discuss Question
Answer: Option A. -> 327°C
Question 854. The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.
  1.    100 g
  2.    1000 g
  3.    1 g
  4.    10 g
 Discuss Question
Answer: Option B. -> 1000 g
Question 855. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
  1.    A temperature of 0°C
  2.    A temperature of - 273.16°C
  3.    A negative pressure and 0°C temperature
  4.    A temperature of 273 °K
 Discuss Question
Answer: Option B. -> A temperature of - 273.16°C
Question 856. Work done in a free expansion process is
  1.    Maximum
  2.    Zero
  3.    Positive
  4.    Minimum
 Discuss Question
Answer: Option B. -> Zero
Question 857. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
  1.    0.086
  2.    4.086
  3.    1.086
  4.    1.086
 Discuss Question
Answer: Option C. -> 1.086
Question 858. Mond gas is obtained by
  1.    Carbonisation of bituminous coal
  2.    Passing steam over incandescent coke
  3.    Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
  4.    Passing air and a large amount of steam over waste coal at about 650°C
 Discuss Question
Answer: Option D. -> Passing air and a large amount of steam over waste coal at about 650°C
Question 859. According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as
  1.    Absolute temperature, if volume is kept constant
  2.    Temperature
  3.    Volume, if temperature is kept constant
  4.    None of these
 Discuss Question
Answer: Option A. -> Absolute temperature, if volume is kept constant
Question 860. The heat and mechanical energies are mutually convertible. This statement was established by
  1.    Charles
  2.    None of these
  3.    Joule
  4.    Boyle
 Discuss Question
Answer: Option C. -> Joule

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