Wetlands and forests growing along the banks of rivers remove much nitrogen from groundwater by the process of ________
A) nitrification
B) denitrification
C) immobilization
D) ammonification
E) none of the above
B
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Answer the following statement(s) true (T) or false (F)
1. Changing frequency causes a corresponding change in the inductive reactance of the windings. 2. Alternators are often used to control the speed of several induction motors that require different changes in speed. a. True 3. The Insulated Gate Bipolar Transistor (IGBT) is a current controlled device, not a voltage controlled device 4. Inverter rated motors are specifically designed to be operated by variable frequency drives. 5. Ramping permits the motor to bring the load up to speed slowly as opposed to simply connecting the motor directly to the line.
The back electromotive force is the amount of voltage produced in the starting winding of a motor.
Answer the following statement true (T) or false (F)
An arc will jump ____.
A. to the weld pool B. to the root gap C. the closest metal conductor D. the electrode
Why is alcohol considered to be an oxygenated fuel?
A) It burns in the absence of oxygen B) Oxygen and alcohol combine to form a gel C) It burns in the presence of oxygen D) The fuel itself contains oxygen