Moist air (RH = 60%) at 80^oF enters an Evaporative cooling unit as it enters a greenhouse and leaves at 100% saturation.

How many pounds Water per pound of Air will be required?

Select one:

a. 0.0155 lbs H₂O per lb Air

b. 0.002865 lbs H₂O per lb Air

c. 0.028656 lbs H₂O per lb Air

d. 0.01315 lbs H₂O per lb Air

e. 0.002344 lbs H₂O per lb Air

3. (a) What is the difference between the signal measurement methods in ‘differential mode’ vs ‘single ended measurement’?

A sensor is used to calculate the kinematic attitude of a satellite with respect to a reference frame.

Two stars are observed by the sensor, S1 and S2.

In the reference frame, S1 has coordinates (0, 1, 0) and S2 has coordinates (-1, 0, 0), the three coordinates represent the i,j,k directions in the reference frame.

In the body frame, S1 has coordinates (1 ,0, 0) and S2 has coordinates (0, 1, 0), the three coordinates represent the iB,jB,kB directions in the body frame.

Find the directional cosine matrix which translates the coordinates from the reference frame to the body frame.

a) A mass of 400 kg is to be raised by the actuation of two identical hydraulic cylinders with a piston diameter of 120 mm. Calculate the required system pressure to just raise the load.

(b) If the load is to be raised 600 mm in 10 seconds, what will be the required flowrate (Q) in l min^–1?

What are Rosette analysis and Flexure formula?

Comment on the comparison between experimental values obtained through Rosette analysis with those values obtained through Flexure formula.

The Young’s Modulus of Aluminium is around 70 GPa. Comment on any difference obtained from the experiment and the expected value of 70 GPa.

Each of the two wheels of a motor bike have a mass of mw = 10 kg, radius of rw = 330 mm, and radius of gyration kw = 0.25 m. A motor bike and rider with a total mass of m = 206 kg travels round a bend of radius R = 80 m at a speed of 135 km/h. The engine rotates in the same sense as the wheels and at four times their speed. The engine rotating parts have mass of me = 12 kg and radius of gyration ke = 0.08 m. The combined center of gravity of the cycle and the rider is 0.7 m. Determine  
1.1 the angle of banking of the track for a smooth ride without slip

In a non-ideal Rankine cycle saturated vapor (x=1) enters the turbine at 8.0 MPa and saturated liquid water (x=0) exits the condenser at a pressure of Pexit. Pexit = 0.006 MPa. The net power output of the cycle is given as 100 MW. Knowing that the isentropic efficiency of the pump is 0.85 generate the following plots in Excel or in similar programs for the given range of the isentropic efficiency of the turbine. (Please submit your Excel sheet or your computer program with the homework.)

a) Isentropic efficiency of the turbine 0.7 < ?T < 0.9 vs. steam mass flow rate

b) Isentropic efficiency of the turbine 0.7 < ?T < 0.9 vs. Rate of heat transfer from the boiler to the compressed water at the outlet of the pump

c) Isentropic efficiency of the turbine 0.7 < ?T < 0.9 vs. thermal efficiency of the cycle

An iron block of mass miron = 1 kg at a temperature of Tiron = 200°C is thrown in sub-cooled water of mass m at Twater = 25°C enclosed in an insulated container. Calculate and plot in Excel or in similar programs the entropy generated as a result of the heat transfer process for a range of water mass values between 10 kg and 10,000 kg. (Please submit your Excel sheet or your computer program with the homework.

What is the principle behind the velocity measurement of fuid? What is static pressure? 7. What is flow rate? How to measure the flow rate? How to determine the volmne flow rate for given meter type, fluid characteristics, pressure measurement, temperature and pipe size?

3) A vortex tube receives 0.3 m³/min of air at 600 kPa and 300 K. The discharge from the cold end of the tube is 0.6 kg/min at 245 K and 100 kPa. The discharge from the hot end is at 325 K and 100 kPa. Determine the irreversibility.

hey everyone i would like to need a solution for 1.9D, 1.15D and 1.18D from chapter 1 book fundamentals of machine component design 5th edition

1.9D An incident occurred resulting in a worker’s hand being amputated in a machine called a “pallet notcher” that cuts notches in 2 in. 4 in. lumber (boards), used to build pallets. The boards move on a conveyor to the notcher where they drop into a covered area about four feet long. The covered area houses two sets of staggered rotating knives. The boards go through the first set of knives, notching one end, then through the second set, which notches the opposite end. At the time of the accident, Problems 31 c01.qxd 8/3/11 9:16 AM Page 31 the worker was collecting the notched wood from the exit area of the machine. He was pulling the boards outward as they exited the machine. He felt something hit his fingertip, and when he pulled back, his hand had been removed near the wrist. Additional facts in this accident include: (a) Prior to the day of the accident, the employee had not been stationed at the incident pallet notcher. (b) The incident pallet notcher machine was not the employee’s usual station. (c) The employee was working near the exit area of the notcher at the time of the accident. (d) The area where the boards exit the machine is approximately 7 in. high and 19 to 20 in. from the point of operation. This distance is easily reachable by an employee working at the machine exit. (OSHA report) (e) A piece of “hung” carpet located toward the exit of the machine hindered the visibility of the blades and allowed an employee to reach under it and access the blades. (f) The pallet notcher was not guarded to protect the employees from the point of operation. (OSHA report) (g) The employer knew that guarding was required and was aware that the pallet notcher was not guarded. (OSHA report) (h) The employee reportedly was not informed of the location of the blades for the incident machine. (i) At the time of the accident there was no warning label on the machine to alert the employee that a cutting blade was within his reach. (j) The employee was not instructed to use a pull stick to retrieve boards that do not exit the machine. (k) A “willful” citation (issued when the employer knowingly commits a violation) was proposed for a violation of 1910.212(a)(3)(ii). (OSHA report) Search the OSHA regulations at http://www.osha.gov and specifically review the section 29 CFR 1910.212(a)(3)(ii). Write a paragraph relating this section to the above incident. Also, list ways in which this accident could have been prevented.

1.15D D According to an OSHA director of field programs, a driller was in the process of raising the traveling block and the attached kelly and swivel assembly when an oil drilling rig accident occurred. During an oil drilling operation, an air-chugger winch cable was attached to the kelly pipe as a tag line to prevent it from swinging. Two of the rig hands were monitoring the kelly pipe as it was pulled out of the rat hole. The chain hand picked up the spinning chain and positioned himself near the drawworks drum as he waited for the kelly to be positioned over the hole. When he tossed the end of the spinning chain over his shoulder it became entangled in the fast line cable as the cable was spooled onto the drum. The spinning chain wrapped around the worker’s wrist and pulled him into the drum as the chain’s slack was drawn up. The spinning chain also struck the worker in the groin area and fractured his leg and severed his femoral artery. The driller stopped the drawworks before the worker was completely pulled into the drum encasement, but the worker was seriously injured. His leg was amputated and injuries to his hand resulted in a permanent disability. The drawworks drum was equipped with metal casing that enclosed the drum on the lower front, top, and sides. However, there was an opening of approximately 4' 3' to allow the fast line adequate clearances to spool back and forth onto the drum that has no barrier guard. (See Figure P1.15D.) Apparently, the drawworks drums used on oil well drilling sites were designed and constructed as described above without any barrier guard to protect workers in close proximity to the drawworks drum from the hazard of the ingoing nip point between the moving fast line and the drum. Search the OSHA regulations http://www.osha.gov and specifically review the regulation 29 CFR 1910.212(a)(1), General requirement for all machines. Write a paragraph explaining how this section would apply to the drum. Also, suggest a guard (design) that could have prevented this accident. Problems 35 4 3 Fast line cable

1.18D An incident occurred in which a cantilevered section of a walkway under demolition fell in a bagasse warehouse area at a sugar mill, resulting in the death of a worker positioned on top of the walkway. The incident walkway was constructed of two 2.625 in. by 10 in. steel C-channel main beams spaced three feet apart with metal floor grating welded to the top of the C-channel beams. The cantilevered walkway had welded-on hand rails and was approximately three ft in width, 11 ft in length and located at a height of 40 ft from ground level. This section weighed more than 800 lbs. The worker was positioned on the cantilevered portion of the walkway cutting through the floor grating of the walkway when the cantilevered walkway section unexpectedly gave way and fell to the area below. The demolition of the walkway left one section of the walkway cantilevered and supported by the metal floor grating and by an undersized weld. Demolition proceeded without an engineering study of the structural integrity of the bagasse walkway as well as an adequate plan for demolition. A proper engineering study of the structural integrity of the bagasse warehouse walkway as well as an adequate demolition plan in reasonable engineering probability would have prevented the accident. Search the OSHA regulation at http://www.osha.gov and review the sections 29 CFR 1926.501(a)(2) and 29 CFR 1926.850(a). Write a paragraph relating each section to the above incident and describe how following the regulations would have reduced the risk to employees.

determine the speed of sound in refrigerant-134a at 0.1 MPa and 60°C

a.) What are the two main types of TTT diagrams that are widely used?

b.) Why do isothermal TTT diagrams exhibit such a characteristic C- shape for diffusional transformations?

c.) Which influence do alloying elements have on the transformation behaviour of steels?

d.) Why should TTT diagrams always include the austenitisation parameters?