Describe the basic operation and components of a centrifugal pump.
What will be an ideal response?
Centrifugal pumps move liquids trough centrifugal force. The primary principle involves spinning the liquid in a circular motion and directing it into the discharge line. The basic components of a centrifugal pump includes; the outer casing, motor, coupling, volute, suction eye, impellers, wear rings, bearings, seals, and discharge nozzle.
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Formaldehyde is emitted from a furniture manufacturing plant at 20 ppm. The process only operates 12 hours per week over 4 different days. The exhaust gas temperature is 25°C. What type of control system would you recommend? You are an engineer for Wood Spec, Inc., a low-cost furniture manufacturer. The owners are planning to significantly expanding their manufacturing facility in a rural area of the Northwest. The U.S. EPA has asked them to estimate the plant expansion effects on local air quality. The plant expansion will process 3 million m2 of particle board (std, UF) daily. You, the engineer, are given the following information based on previous sampling events:
o Exhaust gas temperature from the stack is on average 300 K and exits the stack at 145 m/s.
o Typical meteorological conditions were obtained from a local weather station:
- Strong solar radiation
- Ambient temperature = 299 K
- Wind speed at 10 m = 2 m/s
- Actual lapse rate = -0.015 K/m.
o Both formaldehyde and particulates are a concern. Use emission factors for the most conservative estimate of formaldehyde emissions. Also, assume that 1 mole of formaldehyde reacts in the atmosphere to form 1 mole of ozone.
o The data in Table 5.26 were collected from meteorological stack testing, o Calculate the emission rate of formaldehyde and total particulate matter (PM) in mg/s.
Note: Assume the height of the physical stack is 10 meters
a. What region of the respiratory system is most likely to be affected by each type of PM?
i. Chips
ii. Sawdust
iii. Fine PM
b. What region is least likely to be affected by each type of PM?
c. What is the concentration of formaldehyde in units of PPM in the exhaust stack prior to being emitted into the atmosphere?
d. What is the permissible exposure level (PEL) for formaldehyde?
e. Does this concentration exceed the PEL for workers in the building?
f. How high will the plume rise from the stack in meters?
g. Use Excel to determine the distance in kilometers from the stack will the plume concentration at ground level be greatest (maximum)?
h. What is the maximum predicted ground-level concentration of formaldehyde and total PM assuming these pollutants are reflected?
i. The background concentration of PM is 10 ?g/m3 and ozone is 45 ?g/m3.
Will this location remain in compliance with the United States NAAQS PM and ozone standards based upon the maximum predicted concentration of the pollutants?
What will be an ideal response?
Refrigeration equipment is designed to _____.
a. eliminate cold air b. recirculate hot air c. remove heat d. eliminate condensation
Slip is best defined as _____
a. the difference between the synchronous speed and the speed of the rotor in an induction motor b. the rated output capacity of a motor c. any current in excess of the rated current of equipment d. the speed of the revolving field of the stator AGRICULTURAL MECHANICS AND METAL TECHNOLOGIES - TX. ED., VOL. 1 MODULE 26202-14 EXAM 1 Copyright © 2017 NCCER. Permission is granted to reproduce this page provided that copies are for local use only and that each copy contains this notice.
The lead of a screw is:
A) A lead bolt B) Part of an engine lathe C) The chamfer on the end of a threaded part D) The distance that a threaded mating part will move when rotated one revolution