Test: Properties of Gasses & Gas Mixture - 1 - Mechanical Engineering MCQ
20 Questions MCQ Test - Test: Properties of Gasses & Gas Mixture - 1
A mono-atomic ideal l gas (γ = 1.67, molecular weight = 40) is compressed adiabatically from 0.1 MPa, 300 K to 0.2 MPa. The universal gas constant is 8.314 kJ kmol-1K-1. The work of compression of the gas (in kJ kg-1) is:
According to the Avogadro's law, what is the relation between volume of 1 kg mol of oxygen and volume of 1 kg mol of nitrogen, at normal pressure and temperature? (Mass of 1 kg mol of oxygen is 32 kg and mass of 1 kg mol of nitrogen is 28 kg)
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A frictionless piston-cylinder device contains a gas initially at 0.8 MPa and 0.015 m3. It expands quasi-statically at constant temperature to a final volume of 0.030 m3. The work output (in id) during this process will be:
Assertion (A): The mass flow rate through a compressor for various refrigerants at same temperature and pressure, is proportional to their molecular weights.
Reason (R): According to Avogardo‟s Law all gases have same number of moles in a given volume of same pressure and temperature.
In a reversible isothermal expansion process, the fluid expands from 10 bar and 2 m3 to 2 bar and 10m3, during the process the heat supplied is 100 kW. What is the work done during the process?
Which of the following statement is correct?
and for a diatomic gas 
The correct sequence of the decreasing order of the value of characteristic gas constants of the given gases is:
Pressure reaches a value of absolute zero
If momentum is zero then C must be zero. Hence P would be zero. That will occur at absolute zero temperature. But note here choice (a) has in defined temp. –273K which is imaginary temp.Which of the following statement about Van der waal's equation i valid?
Consider the following statements:
1. A gas with a compressibility factor more than 1 is more compressible than a perfect gas.
2. The x and y axes of the compressibility chart are compressibility factor on y-axis and reduced pressure on x-axis.
3. The first and second derivatives of the pressure with respect to volume at critical points are zero.
Which of the statements given above is/are correct?
Assertion (A): At very high densities, compressibility of a real gas is less than one.
Reason (R): As the temperature is considerably reduced, the molecules are brought closer together and thermonuclear attractive forces become greater at pressures around 4 MPa.
Assertion (A): The value of compressibility factor, Z approaches zero of all isotherms as pressure p approaches zero.
Reason (R): The value of Z at the critical points is about 0.29.
A control mass undergoes a process from state 1 to state 2 as shown in the given figure. During this process, the heat transfer to the system is 200 KJ. IF the control mass returned adiabatically. From state 2 to state 1 by another process, then the work interaction during the return process (in kNm) would be:
A balloon which is initially collapsed and flat is slowly filled with a gas at 100 kPa so as to form it into a sphere of 1 m radius. What is the work done by the gas in the balloon during the filling process?
This process is one in which there is only work interaction between the system and the Surroundings
The work done in compressing a gas isothermally is given by
The work done during expansion of a gas is independent of pressure if the expansion takes place
Three moles of an ideal gas are compressed to half the initial volume at a constant temperature of 300k. The work done in the process is
Assertion (A): Though head is added during a polytropic expansion process for which γ > n> 1, the temperature of the gas decreases during the process.
Reason (R): The work done by the system exceeds the heat added to the system.
The heat absorbed or rejected during a polytropic process is equal to:
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