[A]. reversible cycles
[B]. irreversible cycles
[C]. semi-reversible cycles
[D]. quasi-static cycles
✅ The correct answer is option A.
Thermodynamics MCQs
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
[A]. cracking
[B]. carbonisation
[C]. fractional distillation
[D]. full distillation
✅ The correct answer is option C.
The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
[A]. equal to one
[B]. less than one
[C]. greater than one
[D]. none of these
✅ The correct answer is option C.
According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.
[A]. equal to
[B]. directly proportional to
[C]. inversely proportional to
null
✅ The correct answer is option B.
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.
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.
Which of the following has the minimum atomic mass?
[A]. Oxygen
[B]. Sulphur
[C]. Nitrogen
[D]. Carbon
✅ The correct answer is option D.
The atomic mass of oxygen is
[A]. 12
[B]. 14
[C]. 16
[D]. 32
✅ The correct answer is option C.
Which of the following represents Otto cycle on temperature – entropy (T – s) diagram?
[A].
[B].
[C].
[D].
✅ The correct answer is option C.
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.