Engineering, 29.07.2020 04:01 imthebestatcod
8. Which of the following respirator are positive-pressure respirators?
A. Atmosphere-supplying respirator
B. Dust mask
C. Full-face air-purifying respirator
D. Self-contained breathing apparatus
E. Powered air-purifying respirator
Answers: 3
Engineering, 04.07.2019 18:10
Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.
Answers: 3
Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
Engineering, 04.07.2019 19:10
What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?
Answers: 2
Engineering, 04.07.2019 19:20
Consider airflow over a flat plate of length l = 1.5 m under conditions for which transition occurs at le = 0.9 m based on the critical reynolds number, re,e = 5 x 10. evaluating the thermophysical properties of air at 400 k, determine the air velocity. (hint: use the tables to find the properties of air)
Answers: 3
8. Which of the following respirator are positive-pressure respirators?
A. Atmosphere-supplying res...
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