The machine is used as a Type 2 wind turbine operating under regenerative braking. The wind exerted a torque of 200 Nm on the machine. Compute the speed of the machine if a 2 ? resistance is inserted into the rotor.
A six-pole, 480 V induction machine has the following parameters:
Solution:
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Polarized capacitors are generally referred to as ____ capacitors.
a. AC b. solid-state c. electrolytic d. low-capacitance
Which of the following plants forms a symbiotic relationship with rhizobia bacteria?
a. soybean c. wheat b. corn d. carrot
The dampers on registers are normally not used for balancing the system airflow because:
A) They will produce excessive noise in the space. B) They do not seal off tightly enough to be used for balancing dampers. C) Most registers do not have integral dampers. D) They are more difficult to adjust than dampers in the duct system.
The warning posted on CMVs, "If you can't see my mirrors, I can't see you," is necessary because a driver has a large blind spot
A. to the right of the rig B. to the left of the rig C. behind the rig D. all of the above