When an ammeter is used properly to measure the current in a circuit branch, the meter will introduce a voltage drop in the branch which
A. is independent of current
B. increases with increasing current
C. decreases with increasing current
Answer: B
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Before any repairs can be made to a gas compressor, all the energy sources must be ________
A) relieved B) isolated C) shut down D) purged
A frictionless 400-mm-diameter piston sits on top of 2 kg of water in a cylinder such that the pressure is initially at 120 kPa at a temperature of 80ºC. Heat is added until the piston rises a distance of 2 m, at which state the quality of the steam is nearest:
A) 0.19 B) 0.14 C) 0.088 D) 0.034
If the power to a condensing unit has been turned off for an extended period of time, the _________________________ should be energized first for the recommended time to protect the compressor from liquid floodback.
Fill in the blank(s) with the appropriate word(s).
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