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Mechanical Engineering
Monod kinetics are considered in a CSTR with an organism growing with an initial substrate concentration of 50 g/l and kinetic parameters of Ks-2g/l and pmax 0.5 h. What would be the maximum dilution rate for 100% yield of biomass with maximum rate?
Mechanical Engineering
Tetrahymena thermophila protozoa have a minimum doubling time of 6.5 hours when grown using bacteria as the limiting substrate. The yield of protozoal biomass is 0.33 g per g of bacteria and the substrate constant is 12 mg/ L. The protozoa are cultured at steady state in a chemostat using a feed stream containing 10 g 1 of nonviable bacteria. What is the maximum dilution rate for operation of the chemostat?
Mechanical Engineering
In the analysis of unsteady flow, or transient flow, processes, the system is abandoned in favour of a control volume. Attention is given to a fixed region in space, not to a fixed mass in motion. The control volume, defined by an imaginary closed boundary, is set up to surround the equipment under study. Both mass and energy may cross the boundary.
What is the difference between Upright Cylindrical Vessel and Spherical Vessel?
Mechanical Engineering
A nationwide survey of 20,000 students by the university revealed that almost 78% disapprove of smoking. If 15 of these seniors are selected at random and asked their opinions are selected at random and asked their opinions, what is the probability that more than 11 but less than 14 disapprove of smoking? *
Mechanical Engineering
The figure is a drawing of a 4- by 20-mm latching spring. A preload is obtained
during assembly by shimming under the bolts to obtain an estimated initial
deflection of 2 mm. The latching operation itself requires an additional
deflection of exactly 4 mm. The material is ground high-carbon steel, bent then
hardened and tempered to a minimum hardness of 490 Bhn. The inner radius of
the bend is 10 mm. Estimate the yield strength to be 90 percent of the ultimate
strength.
(a) Find the maximum and minimum latching forces.
(b) Determine the fatigue factor of safety for infinite life, using the modified
Goodman criterion.
(c) **Two Bolts of the following properties are used to fix the spring to the frame.
Determine the load carried by each bolt and the stresses in each bolt.
I wish a neat solution for PART C two bolts...
Bolt grade Bolt spec. ISO 9.8 M12 X 1.75 F 140 А A 10 R - 20- 4 Section A-A
during assembly by shimming under the bolts to obtain an estimated initial
deflection of 2 mm. The latching operation itself requires an additional
deflection of exactly 4 mm. The material is ground high-carbon steel, bent then
hardened and tempered to a minimum hardness of 490 Bhn. The inner radius of
the bend is 10 mm. Estimate the yield strength to be 90 percent of the ultimate
strength.
(a) Find the maximum and minimum latching forces.
(b) Determine the fatigue factor of safety for infinite life, using the modified
Goodman criterion.
(c) **Two Bolts of the following properties are used to fix the spring to the frame.
Determine the load carried by each bolt and the stresses in each bolt.
I wish a neat solution for PART C two bolts...
Bolt grade Bolt spec. ISO 9.8 M12 X 1.75 F 140 А A 10 R - 20- 4 Section A-A
Mechanical Engineering
temperature distribution of 1D circular tube
Mechanical Engineering
An ideal Stirling cycle cooler, using helium (considered ideal) as its working fluid, has a compression temperature Tc=32°C and an expansion temperature
has a compression temperature Tc=32°C and an expansion temperature
TE=-21°C.
If state 1, at the beginning of the compression, is defined with a volume V1=40
cm3 and a pressure P1=1.8 MPa, and state 2 is defined with a volume V2=33
cm3, what is the heat qE absorbed during the expansion process (in Joules)?
has a compression temperature Tc=32°C and an expansion temperature
TE=-21°C.
If state 1, at the beginning of the compression, is defined with a volume V1=40
cm3 and a pressure P1=1.8 MPa, and state 2 is defined with a volume V2=33
cm3, what is the heat qE absorbed during the expansion process (in Joules)?
Mechanical Engineering
a shunt dc motor has the following specification ,field resistance of 170 ohms, armature resistance of 3ohms,armature current of 7A ,voltage source of 14v and flux density of 5va determine the rated torque,starting torque,starting current at full voltage,starting speed and speed at rated torque
Mechanical Engineering
Determine the volume occupied by 10 kg water at a pressure of 10 MPa and a temperature of (a)5"C, (b)200 "C, (c) 400 "C, (d)800 "C, (e) 1500 "C, and (f)-10 "C. Ans. (a)0.00996 m3 (b)0.0115 m3 (c) 0.2641 m3 (d)0.4859 m3 (e)0.8182 m3 (f)0.01089 m3
2
2
Mechanical Engineering
Two kg of steam at a quality of 0.80 is contained in the volume shown (Fig. 2-8). A spring is then brought in contact with the top of the piston and heat is added until the temperature reaches 500°C. Determine the final pressure. (The force in the spring is Kx, where x is the displacement of the spring. This results in a trial-and-error solution.) Ans. 220 kPa
Fig. 2-8
Fig. 2-8
