Which type of metering device is able to respond to changes in system operations?
A) Hand-operated expansion valves B) Modulating metering devices
C) Fixed metering devices D) Fixed valves
B
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Calculate the following:
A dc, separately excited motor is used to hoist a constant-weight load. The motor is driven by a full-wave, ac/dc converter. The voltage on the ac side is 110 V (rms). The field constant of the motor K? is 3 Vs, and the armature resistance is 1 ?. The armature current is continuous under loaded conditions. When the triggering angle is 30o, the motor speed is 60 rpm. a. Load torque b. Load power c. Armature current when the triggering angle is adjusted to 45° d. Motor speed when the triggering angle is reduced to 30° and the field current is reduced by 10%
Neoprene or composition sheathing material is an example of __________.
A. plastic foam material B. compressible material C. non-insulating material D. penetrating material
Increasing the organic matter content of a soil is likely to ________
A) decrease the soil's water holding capacity B) have no effect on water holding capacity C) increase the soil's water holding capacity
List two advantages of open drive compressors
What will be an ideal response?