How is the operation of a float switch controlled?
What will be an ideal response?
The operation of a float switch is controlled by the upward or downward movement of a float placed in a water tank. The float movement causes a rod-operated or chain and counterweight assembly to open or close electrical contacts. The float switch contacts may be either normally open or normally closed and may not be submerged. Float switches may be connected to a pump motor for tank or sump pumping operations or tank filling, depending on the contact arrangement.
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A flange is a feature added to a sheet metal part to reinforce or stiffen a part edge or to provide a surface for fastening or welding.
Answer the following statement true (T) or false (F)
A refrigerated case that maintains a temperature of 28°F would be classified as:
A) A medium-temperature system. B) A low-temperature system. C) A high-temperature system. D) A cryogenic system.
Long-break lines are thick lines with freehand zigzags.
Answer the following statement true (T) or false (F)
Refer to Figure P2.79 but assume that the cantilevered beam loaded by a force F is made of steel. Strain gauges R1, R2, R3, and R4 are attached to the beam and connected in the circuit shown. The force causes a tension stress on the top of the beam that causes the length (and therefore the resistance) of R1 and R4 to increase and a compression stress on the bottom of the beam that causes the length (and therefore the resistance) of R2 and R3 to decrease. The result is a voltage vBA across nodes B and A. Determine this voltage if F = 1.3 MN and
Find:
The force applied on the beam.
Assumptions:
Gage Factor for Strain gauge is 2