Describe how macroinvertebrates are classified
What will be an ideal response?
One way of classifying macroinvertebrates is in terms of their reaction to pollution. Using this system, we can
classify macroinvertebrates into three groups.
? Group 1 organisms are pollution intolerant and easily killed by impurities in the water.
? Group 2 organisms are somewhat pollution tolerant and can survive in slightly polluted water.
? Group 3 organisms are pollution tolerant and can survive in all but the most heavily polluted water.
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The material in Problem 18 has a shrinkage of 95 percent and a swell of 30 percent. Determine the net import or export required for the project and the number of 9-cubic-yard truckloads needed to haul the material to or from the project.
What will be an ideal response?
Use the data of Problem 3.35 and Figure P3.35 and source transformations to determine .
The circuit shown in Figure P3.35 is a simplified DC version of an AC three-phase wye-wye (Y-Y) electrical distribution system commonly used to supply industrial loads, particularly rotating machines.
VS1 = VS2 = VS3 = 170 V
Rw1 = Rw2 = Rw3 = 0.7?
R1 = 1.9? R2 = 2.3?
R3 = 11?
a. Determine the number of non-reference nodes.
b. Determine the number of unknown node voltages.
c. Compute v'1, v'2, v'3, and v’n.
Notice that once v’n is known the other unknown node voltages can be computed directly by voltage division.
?Electrical testing is being discussed: Technician A says that an analog ohmmeter should not be used to test an electronic circuit. Technician B says that a digital ohmmeter may be used to test any electrical or electronic circuit on the vehicle.Who is correct?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B
If the tank is a reusable tank, there are no check valves and system refrigerant can enter the tank as long as the system pressure is higher than the pressure in the tank.
Answer the following statement true (T) or false (F)