In the process of methanol production, a gas stream flowing at a molar flow rate of 100 mol / min containing 32 mol% CO, 64 mol% Hz. and 4 mol% of N2 is led to the reactor. The product from the reactor is condensed where liquid methanol is separated. Unreacted gases are recycled in a ratio of 5: 1 mol of recycle to moles of fresh feed. Parts of the recycled gases are purged. The reaction equation is CO + 2H2 - CH2OH. A- Calculate purge, recycle, and product flow rates and compositions. B - Check the reactor material balance.

The service life of a battery used in a cardiac pacemaker is assumed to be normally distributed. A sample of twelve batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lifetimes (in hours) are obtained: 26.7, 26.8, 25.8, 24.7, 24.6, 27.4, 25.5, 27.2, 27.5, 24.9, 26.9, and 25.5. Test the hypothesis that the mean battery life exceeds 25 hours.

A.) State the null and alternative hypothesis.

B.) Compute the test statistics.

C.) Compute the P-value.

D.) State a conclusion

E.) Construct a 95% two-sided confidence interval on mean life in the accelerated test.

The data given below are for the adsorption of nitrogen on alumina at 77.3 K. Show that they fit in a BET isotherm in the range of adsorption and find Vmono and hence surface area of alumina (m2 g-1). At 77.3 K, saturation pressure, P* = 733.59 torr. The volumes are corrected to STP and refer to 1 g of alumina. The area occupied by a nitrogen molecule at -195 °C estimated to be     16.2

x 10-20 m2.

Steam at 400°C and 40 bar flows steadily through an adiabatic turbine at a volumetric
flowrate of 5,000 m3/h. The steam leaving the turbine at 1 bar is then cooled at constant
pressure in a condenser to 25°C. The rate of transfer from the condenser is 50 MW.
Calculate the power output generated by the turbine (MW). Clearly state assumptions (if
any) and reference state.

The ammonia gas (mw = 17 kg/kgmol) at 40 oC and 3 atm was transported at flowrate of 5 kg/h by an insulated pipeline having the total thickness of 2.0×10-3 m. The pressure and temperature of the ammonia gas suddenly drop to ambient temperature and pressure of 25 oC and 1 atm. A thorough investigation showed that the ammonia gas leaked to surrounding atmosphere through a pipeline wall cracking hole having an equivalent diameter of 3 mm.

a) State all the assumptions. Determine the mass rate of ammonia gas lost to surrounding atmosphere as well as the mass contamination rate of ammonia gas in the insulated pipeline by air (mw = 28.97 kg/kgmol).

b) Determine the mole fraction air in the pipeline. If repairing the pipeline required 5 hours, how much ammonia gas was lost from the incident.  

Given: Ammonia-air diffusivity, DAB at 298.0 K is 2.8×10-5 m2 /s. The ammonia gas and air at those conditions could be assumed obeyed an ideal gas law. The universal gas constant, R is 8.205×10-2 m3 atm/kmol.K.

Q3)

Briefly write the biomass potential in Malaysia. Describe the efficient thermodynamic cycles that could be used to convert biomass energy for industrial applications.

By using an appropriate example and diagram, explain the steady state diffusion of component A through non-diffusing component B for molecular diffusion of gases.

All normally ductile polymers can also craze even in the absence of solvents, given the right circumstances. The crazing stress of each polymer is slightly sensitive to temperature but insensitive to strain rate. Ductile to brittle transition temperature (Tb) are often found at low temperatures for such polymers; explain why Tb shifts to higher temperatures at increasing strain rates. (Hint: the easiest way to explain this is to use diagrams. If you do, be sure the label the curves and explain briefly what they mean.)

Explain how electricity is produced using a hydrogen fuel cell.

Consider the wall of Gypsum, Insulation, Concrete and Brick. It is located in a city for which the CDD is 800°C.days. The total area of the wall is 600 m2. The interior space is occupied and maintained at constant temperature 24 hours a day for a year. use the information below to answer these questions.

T_inside= 21°C

T_outside= 18°C

Gypsum: x=0.01 m, C=20 W/m2∙°C

Brick: x=0.12 m, k= 1 W/°C

Insulation: x=0.025 m, k= 0.04 W/°C

Block: x=0.20 m, C=5 W/m2∙°C

How much energy is required to cool the building over a year in GJ?

What is the cost to provide this energy if the cooling system is electrically and electricity costs $0.10/kWh with The COP for the cooling system is 2.4?

A tank that initially contains H2O at 0.05 MPa and 100 ºC, is connected to a water vapor line at 0.60 MPa and 200 ºC and is filled to a level where 90% (on a volumetric basis) is liquid. The 1 m3 tank is kept at 100 ºC during the process. Determine the quality of the gas in the second phase, the input mass in (kg) and the heat transfer, in kJ.

Using the information below, produce a set of calibration figures for the
control loop TICA1495.
TI1495 range = 100 to 420°C
TICA1495 SP = PV = 300°C
TCV1495 = 30%.