291. One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
[A]. 8/3
[B]. 11/3
[C]. 11/7
[D]. 7/3
✅ The correct answer is option D.
Thermodynamics MCQs
292. An adiabatic process is one in which
[A]. no heat enters or leaves the gas
[B]. the temperature of the gas changes
[C]. the change in internal energy is equal to the mechanical workdone
[D]. all of the above
✅ The correct answer is option D.
293. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.
[A]. one-half
[B]. one-third
[C]. two-third
[D]. three-fourth
✅ The correct answer is option C.
294. Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.
[A]. Correct
[B]. Incorrect
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✅ The correct answer is option B.
295. Which of the following represents Otto cycle on temperature – entropy (T – s) diagram?
[A].
[B].
[C].
[D].
✅ The correct answer is option C.
296. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
[A]. Boyle’s law
[B]. Charles’ law
[C]. Gay-Lussac law
[D]. all of these
✅ The correct answer is option D.
298. Which of the following has the minimum atomic mass?
[A]. Oxygen
[B]. Sulphur
[C]. Nitrogen
[D]. Carbon
✅ The correct answer is option D.
299. Which of the following statement is incorrect?
[A]. The liquid fuels consist of hydrocarbons.
[B]. The liquid fuels have higher calorific value than solid fuels.
[C]. The solid fuels have higher calorific value than liquid fuels.
[D]. A good fuel should have low ignition point.
✅ The correct answer is option C.
300. When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
[A]. zero
[B]. 1/5
[C]. 4/5
[D]. 1
✅ The correct answer is option A.