What is the lowest percentage of full capacity that a digital scroll can be safely operated for extended periods?
A) The minimum capacity is 10% to ensure that the compressor gets proper lubrication.
B) The compressor can be operated at 0% by simply leaving the unloading solenoid energized.
C) The digital scroll compressor cannot be operated below 50% capacity.
D) The digital scroll compressor can only operate at full capacity.
A
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VARs is often referred to as ____.
a. apparent power b. watt less power c. power factor d. volt-amps
______ are chemical messengers that are sent through the bloodstream, triggering growth and development of cells elsewhere in the body.
Fill in the blank(s) with the appropriate word(s).
The California Air Research Board was put in place for what purpose?
Implement more strict air standards Both A & B Implement annual emissions testing Neither A nor B
A separately excited DC motor has the following parameters:
Ra = 0.1 ? R f = 100 ? La = 0.2 H L f = 0.02 H Ka = 0.8 K f = 0.9 An inertial load has J = 0.5 kg-m2 and b = 2 N-m-s/rad. No external load torque is applied. a. Sketch a diagram of the system and derive the (three) differential equations. b. Sketch a simulation block diagram of the system (you should have three integrators). c. Code the diagram, using Simulink. d. Run the following simulations: Armature control. Assume a constant field with Vf = 100 V; now simulate the response of the system when the armature voltage changes in step fashion from 50 to 75 V. Save and plot the current and angular speed responses. Field control. Assume a constant armature voltage with Va = 100 V; now simulate the response of the system when the field voltage changes in step fashion from 75 to 50 V. This procedure is called field weakening. Save and plot the current and angular speed responses.