we use a natural resource carefully and in such a way that we should not “run out” of it in the foreseeable future, we
are practicing .
What will be an ideal response?
Conservation.
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In a parallel compressor system, oil often does not return at the same rate to all of the compressors because:
A) Only some of the compressors require oil return. B) All the compressors do not use the same type of refrigerant oil. C) All the compressors do not operate for the same length of time. D) Parallel compressors are normally stacked vertically, so most of the returning oil returns to the crankcase of the bottom compressor.
Which of the following is true about relative humidity?
a. It doesn’t change with the temperature of the air. b. It is the actual amount of water vapor present per lb or kg of air. c. It decreases with the air temperature. d. For a given amount of water vapor in air, it varies with air temperature.
The spacing between bolts, or pitch, in standard bolted connections is usually _______________.
Fill in the blank(s) with the appropriate word(s).
If two power-side insulated wires were to melt together to the point that the copper conductors touched each other, the type of failure would be called a(an) ________.
A) Short-to-ground B) Short-to-voltage C) Open D) Floating ground