When soldering 1-1/2" tubing in a horizontal position, you should _____.
a. feed the solder from a single point
b. start feeding solder at the top and work down
c. start feeding solder near the bottom and work up
d. turn the assembly to the vertical position first
c. start feeding solder near the bottom and work up
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The ____________________ refers to the center-to-center distance between the spot welds.
Fill in the blank(s) with the appropriate word(s).
Describe three of the key principles that are a focus of the Business Continuity Institute certification.
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. A very common and reliable method for sensing temperature is by the evaporation of metal. 2. One very common device that operates on the principle of expansion and contraction of metal is the line voltage thermostat. 3. The shorter the bimetal strip is, the more movement that will be produced by a change of temperature. 4. The amount of voltage produced by a thermocouple is small. 5. Thermistors are thermally sensitive semiconductor devices.
The most common types of defrost for commercial refrigeration evaporators are:
A) Inductive, and ultrasonic defrost. B) Electric and hot gas defrost. C) Reverse cycle and air defrost. D) Mechanical and hydraulic.