Test: Properties of Gasses & Gas Mixture - 2 - Mechanical Engineering MCQ
30 Questions MCQ Test - Test: Properties of Gasses & Gas Mixture - 2
A football was inflated to a gauge pressure of 1 bar when the ambient temperature was 15°C. When the game started next day, the air temperature at the stadium was 5°C. Assume that the volume of the football remains constant at 2500 cm3.
The amount of heat lost by the air in the football and the gauge pressure of air in the football at the stadium respectively equal
A 100 W electric bulb was switched on in a 2.5 m × 3 m × 3 m size thermally insulated room having a temperature of 20°C. The room temperature at the end of 24 hours will be
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2 moles of oxygen are mixed adiabatically with another 2 moles of oxygen in a mixing chamber, so that the final total pressure and temperature of the mixture become same as those of the individual constituents at their initial states. The universal gas constant is given as R. The change in entropy due to mixing, per mole of oxygen, is given by
Assertion (A): A perfect gas is one that satisfies the equation of state and whose specific heats are constant.
Reason (R): The enthalpy and internal energy of a perfect gas are functions of temperature only.
Consider an ideal gas contained in vessel. If intermolecular interaction suddenly begins to act, which of the following happens?
Consider the following statements:
A real gas obeys perfect gas law at a very
1. High temperature
2. High-pressure
3. Low pressure
Which of the following statements is/are correct?
If a real gas obeys the Clausius equation of state p(v – b) = RT then,
The internal energy of a gas obeying Van der Waal‟s equation 
Which one of the following statements is correct?
The value of compressibility factor for an ideal gas may be:
1. less or more than one
2. equal to one
3. zero 4. less than zero
The correct value(s) is/are given by:
Assertion (A): An adiabatic process is always a constant entropy process.
Reason(R): In an adiabatic process there is no heat transfer.
In which of the following processes, the heat is fully converted into work?
An ideal gas undergoes an isothermal expansion from state R to state S in a turbine as shown in the diagram given below: The area of shaded region is 1000 Nm. What is the amount is turbine work done during the process?
The slope of log P-log V graph for a gas for isothermal change is m1 and for adiabatic changes is m2. If the gas is diatomic gas, then
Air is being forced by the bicycle pump into a tyre against a pressure of 4-5 bars. A slow downward movement of the piston can be approximated as
The change in specific entropy of a system undergoing a reversible process is given by 
This is valid for which one of the following?
Change in enthalpy in a closed system is equal to the heat transferred, if the reversible process takes place at
A saturated vapour is compressed to half its volume without changing its temperature. The result is that:
Which one of the following thermodynamic processes approximates the steaming of food in a pressure cooker?
A system at a given state undergoes change through the following expansion processes to reach the same final volume
1. Isothermal
2. Isobaric
3. Adiabatic ( γ = 1.4)
4. Polytropic(n =1.3)
The correct ascending order of the work output in these four processes is
Four processes of a thermodynamic cycle are shown above in Fig.I on the T-s plane in the sequence 1-2-3-4. The corresponding correct sequence of these processes in the p- V plane as shown above in Fig. II will be
A perfect gas at 27°C was heated until its volume was doubled using the following three different processes separately
1. Constant pressure process
2 Isothermal process
3. Isentropic process
Which one of the following is the correct sequence in the order of increasing value of the final temperature of the gas reached by using the above three different processes?
Assertion (A): For a perfect gas, hyperbolic expansion is an isothermal expansion.
Reason (R): For a perfect gas, PV/T = constant.
An ideal gas with initial volume, pressure and temperature of 0.1 m3, 1bar and 27°C respectively is compressed in a cylinder by a piston such that its final volume and pressure are 0.04 m3 and 5 bars respectively, then its final temperature will be:
An Ideal gas with initial volume, pressure and temperature of 0.1m3, 1 bar and 27°C respectively is compressed in a cylinder by piston such that its final volume and pressure 0.04 m3 and 5 bar respectively, then its final temperature will be:
If a gas obeys van der Waals' equation at the critical point, then 
is equal to which one of the following
A higher value of Van der waal‟s constant for a gas indicates that the
Consider the following statements:
1. During a reversible non-flow process, for the same expansion ratio, work done by a gas diminishes as the value of n in pvn = C increases.
2. Adiabatic mixing process is a reversible process.
Which of the statements given above is/are correct?
In a reversible isothermal expansion process, the fluid expands from 10 bar and 2 m3 to 2 bar and 10 m3. During the process the heat supplied is at the rate of 100 kW. What is the rate of work done during the process?
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