One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.
Answer the following statement true (T) or false (F)
True
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Concern is expressed on the part of the current administration about what should be the optimal tax rate for those households who make more than $250,000 per year. This issue corresponds to what branch of economics?
What will be an ideal response?
?Is there any benefit to the mill scale that can be found on almost all hot rolled steel?
A. ?It can help the deoxidizers in the filler metal to react with the weld to make a better weld. B. ?It can help to prevent rust from forming. C. ?It acts like a dam along the sides of the weld pool to keep the weld bead from getting too wide. D. ?No it has no benefit.
When you write a script, it is advisable to specify with what shell the script is intended to be used. How can you do this?
What will be an ideal response?
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.